# List of 9-1-1 characters

9-1-1 is an American television series that originally began broadcasting on January 3, 2018, on Fox.

## Overview

| Character | Portrayed by | Seasons | Seasons | Seasons | Seasons | Seasons | Seasons | Seasons | Seasons |
| Character | Portrayed by | 1 | 2 | 3 | 4 | 5 | 6 | 7 | 8 |
| Main Cast ||||||||||
| Athena Grant-Nash | Angela Bassett | Main | Main | Main | Main | Main | Main | Main | Main |
| Robert "Bobby" Nash | Peter Krause | Main | Main | Main | Main | Main | Main | Main | Main |
| Evan "Buck" Buckley | Oliver Stark | Main | Main | Main | Main | Main | Main | Main | Main |
| Henrietta "Hen" Wilson | Aisha Hinds | Main | Main | Main | Main | Main | Main | Main | Main |
| Howard "Chimney" Han | Kenneth Choi | Main | Main | Main | Main | Main | Main | Main | Main |
| Michael Grant | Rockmond Dunbar | Main | Main | Main | Main | Main | Does not appear | Does not appear | Does not appear |
| Abigail "Abby" Clark | Connie Britton | Main | Does not appear | Special Guest | Does not appear | Does not appear | Does not appear | Does not appear | Does not appear |
| Maddie Buckley-Han | Jennifer Love Hewitt | Does not appear | Main | Main | Main | Main | Main | Main | Main |
| Edmundo "Eddie" Diaz | Ryan Guzman | Does not appear | Main | Main | Main | Main | Main | Main | Main |
| May Grant | Corinne Massiah | Recurring | Main | Main | Main | Main | Main | Guest | TBA |
| Harry Grant | Marcanthonee Jon Reis | Recurring | Main | Main | Main | Main | Main | Does not appear | Does not appear |
| Harry Grant | Elijah M. Cooper | Does not appear | Does not appear | Does not appear | Does not appear | Does not appear | Does not appear | Recurring | TBA |
| Christopher Diaz | Gavin McHugh | Does not appear | Recurring | Main | Main | Main | Main | Main | Main |
| Albert Han | John Harlan Kim | Does not appear | Does not appear | Guest | Main | Recurring | Guest | Does not appear | TBA |
| Recurring Cast ||||||||||
| Karen Wilson | Tracie Thoms | Recurring | Recurring | Recurring | Recurring | Recurring | Recurring | Recurring | Recurring |
| Carol Branford | Michelle Bernard | Recurring | Recurring | Recurring | Recurring | Recurring | Recurring | Recurring | Recurring |
| Carla Price | Cocoa Brown | Recurring | Recurring | Guest | Recurring | Guest | Guest | Does not appear | Does not appear |
| Terry Flores | Alex Loynaz | Recurring | Recurring | Guest | Does not appear | Guest | Does not appear | Does not appear | Does not appear |
| Eva Mathis | Abby Brammell | Recurring | Guest | Does not appear | Does not appear | Guest | Does not appear | Does not appear | Does not appear |
| Father Brian | Gavin Stenhouse | Recurring | Guest | Does not appear | Does not appear | Does not appear | Does not appear | Does not appear | Guest |
| Patricia Clark | Mariette Hartley | Recurring | Does not appear | Does not appear | Does not appear | Does not appear | Does not appear | Does not appear | Does not appear |
| Denny Wilson | Declan Pratt | Guest | Recurring | Recurring | Recurring | Recurring | Recurring | Recurring | Recurring |
| Susan "Sue" Blevins | Debra Christofferson | Guest | Recurring | Recurring | Recurring | Recurring | Guest | Guest | Guest |
| Elaine Maynard | Claudia Christian | Guest | Guest | Recurring | Guest | Recurring | Guest | Guest | Recurring |
| Josh Russo | Bryan Safi | Does not appear | Recurring | Recurring | Recurring | Recurring | Recurring | Recurring | Recurring |
| Linda Bates | Chiquita Fuller | Does not appear | Recurring | Recurring | Recurring | Recurring | Guest | Does not appear | Does not appear |
| Isabel Diaz | Ana Mercedes | Does not appear | Recurring | Guest | Guest | Guest | Does not appear | Guest | Does not appear |
| John | Jonathan Grebe | Does not appear | Recurring | Guest | Does not appear | Does not appear | Does not appear | Does not appear | Does not appear |
| Shannon Diaz | Devin Kelley | Does not appear | Recurring | Guest | Does not appear | Does not appear | Does not appear | Guest | Does not appear |
| Kim | Devin Kelley | Does not appear | Does not appear | Does not appear | Does not appear | Does not appear | Does not appear | Guest | Does not appear |
| Dwight | Rick Chambers | Does not appear | Recurring | Does not appear | Guest | Does not appear | Does not appear | Does not appear | Does not appear |
| Ali Martin | Tiffany Dupont | Does not appear | Recurring | Does not appear | Does not appear | Does not appear | Does not appear | Does not appear | Does not appear |
| Thomas "Tommy" Kinard | Lou Ferrigno Jr. | Does not appear | Recurring | Does not appear | Does not appear | Does not appear | Does not appear | Recurring | Recurring |
| Douglas "Doug" Kendall | Brian Hallisay | Does not appear | Recurring | Does not appear | Does not appear | Does not appear | Guest | Guest | Does not appear |
| Nathaniel Greene | Troy Winbush | Does not appear | Recurring | Does not appear | Does not appear | Does not appear | Recurring | Does not appear | Does not appear |
| Taylor Kelly | Megan West | Does not appear | Guest | Does not appear | Recurring | Recurring | Guest | Does not appear | Does not appear |
| Beatrice Carter | Beverly Todd | Does not appear | Guest | Guest | Does not appear | Does not appear | Recurring | Does not appear | Does not appear |
| Samuel Carter | Henry G. Sanders | Does not appear | Guest | Does not appear | Does not appear | Does not appear | Recurring | Does not appear | Does not appear |
| Vincent Gerrard | Brian Thompson | Does not appear | Guest | Does not appear | Guest | Does not appear | Does not appear | Recurring | Recurring |
| Officer Williams | Chris Wu | Does not appear | Does not appear | Recurring | Recurring | Recurring | Guest | Guest | Does not appear |
| Jamal Momed | Ashwin Gore | Does not appear | Does not appear | Recurring | Recurring | Recurring | Does not appear | Does not appear | Does not appear |
| Lena Bosko | Ronda Rousey | Does not appear | Does not appear | Recurring | Does not appear | Does not appear | Does not appear | Does not appear | Does not appear |
| Tara | Ellen Hollman | Does not appear | Does not appear | Recurring | Does not appear | Does not appear | Does not appear | Does not appear | Does not appear |
| Vincent | Scott Speiser | Does not appear | Does not appear | Recurring | Does not appear | Does not appear | Does not appear | Does not appear | Does not appear |
| Greg | Sean Kleier | Does not appear | Does not appear | Recurring | Does not appear | Does not appear | Does not appear | Does not appear | Does not appear |
| Ronald "Ronnie" Cooper | Leonard Roberts | Does not appear | Does not appear | Recurring | Does not appear | Does not appear | Does not appear | Does not appear | Does not appear |
| Dr. Calloway | Christian Keyes | Does not appear | Does not appear | Recurring | Does not appear | Does not appear | Does not appear | Does not appear | Does not appear |
| David Hale | La Monde Byrd | Does not appear | Does not appear | Guest | Recurring | Recurring | Does not appear | Does not appear | Does not appear |
| Ana Flores | Gabrielle Walsh | Does not appear | Does not appear | Guest | Recurring | Recurring | Does not appear | Does not appear | Does not appear |
| Louis Ransone | Sasha Roiz | Does not appear | Does not appear | Guest | Guest | Recurring | Does not appear | Does not appear | Does not appear |
| Jeffrey Hudson | Noah Bean | Does not appear | Does not appear | Guest | Does not appear | Recurring | Does not appear | Does not appear | Does not appear |
| Antonia "Toni" Wilson | Marsha Warfield | Does not appear | Does not appear | Does not appear | Recurring | Guest | Guest | Does not appear | Does not appear |
| Diedra | Andi Chapman | Does not appear | Does not appear | Does not appear | Recurring | Does not appear | Guest | Guest | Does not appear |
| Nia Wilson | Margot Terry | Does not appear | Does not appear | Does not appear | Recurring | Does not appear | Does not appear | Does not appear | Does not appear |
| Ravi Panikkar | Anirudh Pisharody | Does not appear | Does not appear | Does not appear | Recurring | Recurring | Recurring | Recurring | Recurring |
| Lila Risco | Carly Nykanen | Does not appear | Does not appear | Does not appear | Does not appear | Recurring | Does not appear | Does not appear | Does not appear |
| Claudette Collins | Vanessa Estelle Williams | Does not appear | Does not appear | Does not appear | Does not appear | Recurring | Does not appear | Does not appear | Does not appear |
| Jonah Greenway | Bryce Durfee | Does not appear | Does not appear | Does not appear | Does not appear | Recurring | Does not appear | Does not appear | Does not appear |
| Lucy Donato | Arielle Kebbel | Does not appear | Does not appear | Does not appear | Does not appear | Recurring | Recurring | Does not appear | Does not appear |
| Noah Carmack | Alfonso Caballero | Does not appear | Does not appear | Does not appear | Does not appear | Does not appear | Recurring | Does not appear | Does not appear |
| Marisol | Edy Ganem | Does not appear | Does not appear | Does not appear | Does not appear | Does not appear | Recurring | Recurring | Does not appear |
| Natalia Dollenmeyer | Annelise Cepero | Does not appear | Does not appear | Does not appear | Does not appear | Does not appear | Recurring | Does not appear | Does not appear |
| Mara Driskell | Askyler Bell | Does not appear | Does not appear | Does not appear | Does not appear | Does not appear | Does not appear | Recurring | Recurring |
| Julian Enes | Rick Cosnett | Does not appear | Does not appear | Does not appear | Does not appear | Does not appear | Does not appear | Recurring | Does not appear |
| Amir Casey | Malcolm-Jamal Warner | Does not appear | Does not appear | Does not appear | Does not appear | Does not appear | Does not appear | Recurring | Does not appear |
| Brad Torrance | Callum Blue | Does not appear | Does not appear | Does not appear | Does not appear | Does not appear | Does not appear | Does not appear | Recurring |

## Main characters
### Athena Grant-Nash

Athena Grant-Nash (née Carter) (Angela Bassett) is an LAPD patrol sergeant, and mother of May and Harry from her first marriage to Michael Grant. Athena left her home in Florida for Los Angeles to become a police officer as a result of the failed investigation into the murder of her friend and neighbor Tanya Kingston (a murder she helps to solve 45 years later). She is extremely independent, preferring a one-person patrol unit to working with a partner (although she does work with detectives on certain cases) and is extremely tenacious when it comes to solving crimes or chasing down suspects (including the killer of her fiancé decades later after the murder weapon is recovered). However, she can be impetuous and has gone into dangerous situations without back-up (on one occasion getting ambushed and almost killed by a dangerous suspect). Athena and Michael divorce at the end of the first season, after being married for fourteen years. She begins dating Bobby Nash, marrying him at the end of the second season. Because of Buck's own impetuous behavior in dangerous or stressful situations, she is both exasperated by and understanding of him. Due to the traumas, she has suffered in the past, she rarely shows her emotional side (except to Hen) but has begun allowing Bobby in (although at the beginning of Season 7, she has begun to worry that apart from the constant excitement and danger in both their jobs she and Bobby may not have enough in common to sustain their marriage). Pepi Sonuga portrays a younger Athena during the flashback scenes of an episode of season 3 in which she learns that the weapon used to murder her fiancé has been found.

### Robert Nash

Robert "Bobby" Wade Nash (Peter Krause) is the Captain of Station 118 of the Los Angeles Fire Department and later Athena's husband. A recovering alcoholic, which stems from his father who was also a fire captain, he came from St. Paul to Los Angeles after the death of his wife and kids due to a fire he caused from a faulty propane heater. In addition, the apartment building was not up to code) and Bobby blamed himself for not only their deaths but also 145 other people in the building. Originally planning to commit suicide after saving 145 lives as atonement, his friendship/camaraderie with the members of the 118 and his blossoming relationship with Athena helps him put his demons to rest, and he becomes a beloved stepfather to May and Harry and a father figure to Buck. He is also the 118's resident "chef" (although Athena runs him a close second). After a rocky year, he transferred to the LAFD (with his superiors in Minnesota "sanitizing" his record to allow the transfer) and took command of the 118 (which had had six previous captains in the span of two years, giving the station a somewhat unsavory reputation). In the present, he has helped to make the 118 a firehouse to aspire by within the LAFD and create a team which he himself has described as "magic". He is very good friends with Athena's ex-husband Michael, and Athena's daughter May has acknowledged him as her other father. At the end of Season 7, he temporarily resigns from his post as Captain but is convinced to return, only to find that his position has been filled by Captain Gerrard. He then takes up a temporary job as a technical advisor on the meta-firefighter show Hotshots before regaining his captain position by convincing Gerrard to take his place as Hotshots' advisor.

### Evan Buckley

Evan "Buck" Buckley (Oliver Stark) is firefighter at Station 118 and Maddie's younger brother. He joined the LAFD after a series of jobs in various parts of the country. While he can be impetuous to the point of recklessness while in the field, he is dedicated to his job. Because of his dysfunctional relationship with his own parents, he sees and trusts Bobby as a father figure and the members of the 118 as his family. He convinced his sister Maddie to join the 9-1-1 Emergency Dispatch, introduced Abby's mother's former caretaker Carla to Eddie Diaz, and has become a somewhat "co-parent" to Eddie's son Christopher. Buck was an uncontrollable womanizer at first (which nearly cost him his job in Season 1, since he was using LAFD property to facilitate his liaisons), but after meeting Abby he started looking for serious relationships. After Abby's departure, he reverted to "hit-and-run" relationships until he met TV reporter Taylor Kelly, a relationship which lasted in seasons 4–5, until it was shattered by Taylor's betrayal of Buck's trust. In Season 6, he agrees to be a sperm donor for an old friend and his wife who are having fertility problems. In the seventh season, he realizes he is bisexual and begins dating former 118 firefighter Thomas Kinard, they later break up.

### Henrietta Wilson

Henrietta "Hen" Wilson (Aisha Hinds) is a firefighter & paramedic at Station 118. Originally a pharmaceutical representative, she left that job and joined the LAFD as a paramedic after saving her life coach with CPR. She was accepted at Station 118, but like Chimney, was met with prejudice and sexism from the captain and teammates. She became partners and close friends with Chimney due to their shared experiences of being minorities within the house. Hen had also met and befriended police sergeant, Athena Grant, who helped encourage her to stand up for herself within the firehouse. She was originally in an emotionally abusive relationship with Eva, who was a drug addict. Eva was then imprisoned, and Hen met Karen (via a blind date Chimney set up) and later married her. They have an adopted son named Denny, who is the biological son of Eva.
After Eva's release from prison, Hen cheated on Karen with her. This gave Eva a reason to try to get custody of Denny, claiming Hen's infidelity proved that her household was unfit for her son.
In Season 3, Hen decides to apply to medical school and is accepted but is unable to fully balance her hectic school schedule with her paramedic job and her family life, and fails a critical examination. She is allowed to return to medical school, but eventually quits in Season 6, preferring to remain a paramedic. In Bobby's absence, she is Interim Captain.
At the start of the seventh season, the 118 responded to a vehicular collision, where Hen was acting captain while Bobby was away. An intoxicated young man caused the crash and Hen offered medical treatment, but the man refused, leading him to die of his injuries. Hen and Karen later foster their second child, a young girl named Mara Driskell. In the beginning, Mara has trouble adjusting and acts out, which makes the couple almost consider removing her. But Hen ultimately decides to not give up on her and they find out both of Mara's parents died on the same night due to an overdose. After showing her they won't give up on her and they care, Mara starts enjoying her new home. Hen and Karen decide to adopt Mara, but their application is blocked and their fostering license is revoked. It's revealed that the man who refused medical treatment and later died ended up being the son of Councilwoman Olivia Ortiz, who was angered at Hen for letting her son die. In the eighth season, Hen is able to expose Ortiz for her corruption, allowing her and Karen to reassume custody of Mara and have their foster license reinstated.

### Howard Han

Howard "Chimney" Han (Kenneth Choi) is a firefighter & paramedic at Station 118, and Maddie's husband. The reason why he's nicknamed "Chimney" and how he got the nickname is a closely guarded secret and to date has not been revealed. He grew up in the Los Angeles area with his mother while his father returned to South Korea, divorced Chimney's mother and remarried; as a result, their already strained relationship worsened. The elder Mr. Han openly expressed his disappointment in Chimney's chosen profession. After his mother's death, Chimney was raised by the Lee family (his mother and Mrs. Lee were best friends) and looks on them as his family. There, he developed a close bond with their son, Kevin Lee and both worked at a karaoke sushi bar the former managed. A fire burned down the building, but it gave both of them a new sense of passion and enter the fire academy together. They both pass the academy; Kevin was placed at Station 133 and Chimney to 118. Upon his arrival, Chimney was met with a prejudiced boss and was not allowed to go on calls, being forced to do grunt work. The other firefighters were also intolerant and would joke around at Chimney's expense. Eventually he met Eli Cobb, a paramedic, where he had him on his service, which led to Chimney deciding to become a firefighter-paramedic. During a building fire, both the 118 and 133 responded, but Kevin is killed when trying to save a pregnant woman. At another call, Chimney correctly deduces there's a gas leak and gets Athena Grant to evacuate the area. Fellow firefighter, Tommy Kinard was also trapped inside, but was able to be saved before the explosion, thus Chimney earning the firehouse's respect.
In the first season, Chimney gets into a car crash with a truck carrying rebars. One rebar goes through his head, but he miraculously survives. In the second season, he meets Buck's sister, Maddie, whom he takes a liking to and goes out on a couple dates. He meets and befriends her abusive husband, Doug Kendall, although he is unaware of his true identity. One night when Chimney was coming over to Maddie's house, Doug gets through the gates and stabs him. This allowed Doug to kidnap Maddie.
In the third season, Chimney and Maddie's relationship continues to grow and they officially start going out. His younger half-brother, Albert, makes a surprise visit after he secretly left South Korea to escape their father, whom he had been living with for a while. At first, Chimney is cold towards him but after hashing things out, he starts embracing Albert as his brother and they live together for a while. At the end of the season, Maddie and Chimney find out she's pregnant and the baby is.
In the fourth season, Chimney has been staying with Buck, while Maddie is with Albert during lockdown. While Chimney is being overtly cautious as to not risk Maddie getting Covid, he is also nervous to be living with her. Eventually he does decide to back home with Maddie, while Albert goes to live with Buck. During a pile up on the highway, Maddie goes into labor and gives birth to their daughter, Jee-Yun, whom is named after Chimney's late mother. Maddie starts developing postpartum, and it worsens as due to Chimney's busy work schedule.
Chimney tries to be there for Maddie, but also doesn't fully understand the state of her condition. When Maddie disappears for several months, it leaves Chimney distraught and emotional, and at first believes someone was forcing her to leave. He decides to track Maddie down and bring her home, bringing Jee along for the ride and is absent for several episodes. His search leads him to Boston, where he stays with his old friend and colleague, Eli, and also volunteers at the Boston Medical Corps. When responding to a woman for alcohol poisoning, he reunites with Maddie, who had been getting treatment for her postpartum in Boston for the past six months. The two of them talk and tearfully apologize to one another before Chimney takes Maddie to reunite with Jee. When they return to Los Angeles, they decide to break up for now but continue to co-parent.
In the sixth season, Chimney and Maddie get back together, realizing they still love each other. They buy a house together and throw a house warming party. Albert returns from Korea, but to Chimney's surprise and displeasure, had brought their dad along to meet Jee-Yun. Albert thought it would be a good idea for Jee to have a relationship with her grandfather, despite Chimney's own poor relationship with him.
Chimney decides to propose to Maddie, but continues to go back and forth on whether or not to go through with this proposal. He eventually gets the ring but misplaces it and thinks it's a sign to not marry her. However, it turned out Jee-Yun had it and Maddie found it in her dollhouse. After trying it on and not being able to get it off, Maddie decides to propose to Chimney instead and they get engaged. He also aids Hen's investigation into Jonah's past and crimes, which leads to both of them being kidnapped. In the sixth season, it also revealed he was Karen Wilson's neighbor and friend. He had set up a fake blind date for her, as well as making Hen think they're meeting up for drinks so the two could meet. His plan worked, as they're still married in the present.
Their wedding is shown in the seventh season, but it is halted due to Chimney going missing. He had caught an illness while on a call, which caused him to forget almost 20 years of his life and wandered over to where the old sushi bar he worked at was. As his friends and family searched for him, Chimney hallucinates the deceased Doug Kendall as well as Kevin Lee. After "talking" to Kevin's ghost, he manages to make it back to Mr. and Mrs. Lee's house and he is taken to the hospital to be treated. Maddie and Chimney get married in the hospital.
In the eighth season, Maddie and Chimney become Mara Driskell's temporary foster parents in order to help Hen and Karen be able to still see her. This gets Maddie thinking about having another baby after seeing Jee and Mara together, but Chimney is hesitant. They agree about thinking about another baby after setting some rules and boundaries for each other, but it turns out Maddie was pregnant again.

### Maddie Han

Maddie Han (née Buckley) (Jennifer Love Hewitt) (season 2–present) is a 9-1-1 operator, Buck's sister, and Chimney's wife, who replaced Abby Clark as the series' main dispatcher. Originally a nurse at a Boston hospital, Maddie fled to Los Angeles to escape her emotionally and physically abusive husband, Doug Kendall. Buck was instrumental in helping her get a job as a 911 Emergency Dispatcher, as Maddie didn't want to keep being a nurse but she still wanted to be able to help other people. She meets Chimney when he helps her move into her new house and they go out on a few dates. Doug tracks Maddie down in L.A. and befriends Chimney, albeit under a fake name, in order to keep tabs on her. He manages to get past her security gate, stab Chimney, and kidnaps her. While stopping at a gas station, the cashier attempts to help Maddie escape Doug, only to be shot and killed by the latter. Doug brings her to the woods where there are a bunch of lodges and attacks him. After a brief struggle, Maddie manages to stab Doug, killing him.
In the third season, she attempts to help a woman who is being abused by her husband, but in the end the woman proves she cannot be helped and stays with her husband. In the episode "The Taking of Dispatch 9-1-1", the call center is taken over by a group of thieves, holding the entire staff hostage in a planned heist. Their plan is then foiled with the help of Athena & LAPD. Maddie's relationship with Chimney also grows, with the two officially dating and at the end, the couple find out they are having a baby together.
In the fourth season, a pregnant Maddie is in isolation with Chimney's brother, Albert, in an attempt to keep her from getting COVID. Eventually the two move back in with each other. Maddie also trains Athena's daughter, May, to be a dispatcher. During a call for a highway pileup, Maddie goes into labor and attempts to keep working, but is eventually forced to go to the hospital. She gives birth to a baby girl, Jee-Yun, whom they name after Chimney's late mother. After the birth of Jee, Maddie starts experiencing postpartum depression, which causes her to quit her job at dispatch.
In season five, Maddie's postpartum worsens and while giving Jee-Yun a bath, she accidentally lets her slip underwater due to dozing off. This scares Maddie into believing she isn't a good mother, and her daughter isn't safe with her. She records a video for Chimney to explain her disappearance and drops Jee-Yun off at the fire station. She heads to Boston where she enters a program for women diagnosed with PPD for six months, and is absent for several episodes (Hewitt was on maternity leave). After some checkups, her condition is eventually cured but decides to stay in Boston for a bit longer. Chimney, who has been searching for Maddie since she left, runs into her while volunteering for Boston Medical Corps. The two talk things out and she returns home, although they decide to break up for the time being. Maddie resumes her job at dispatch at the end of the season.
In the sixth season, she and Chimney get back together, where they buy a new house together. Chimney also decides to propose to her, but goes back and forth on whether to go through with it. He also misplaces the ring, which Maddie later finds. She then proposes to him instead, and they get married the following season.

### Edmundo Diaz

Edmundo "Eddie" Diaz (Ryan Guzman) (season 2–present) is a firefighter and Christopher's father. A Texas native, he served in the United States Army as a combat medic and moved to Los Angeles after being discharged, joining the 118 fresh out of the academy. He served in Afghanistan and his combat experience is shown through his ability to think quickly on his feet even under duress with minimal back-up. He married his high school sweetheart, Shannon, and had a son named Christopher when they were both 19. In his origin episode, "Eddie Begins", he discovers their son has cerebral palsy and he re-enlists for another tour in 2013. This causes a strain on his marriage, which was already having issues but Eddie left anyways, saying it was to provide for the family. Shannon was left to raise their son alone while Eddie was deployed, which put a lot of stress on her. When he returned, Shannon left Texas to take care of her sick mom in California as well as escape her marital issues with Eddie. She still didn't return when her mom died and was MIA for two years, leaving Eddie to raise Christopher alone. His relationship with his own parents was rocky at best, as they viewed Eddie incapable of taking care of his son. They insisted Christopher live with them for consistency, which causes Eddie to storm out mid-argument. He decides to move to Los Angeles to escape them, taking Christopher with him. Upon entering the 118, Eddie fits right in with the team, much to Buck's jealousy. He assures Buck there's no need for them to be at odds, and they eventually earn each other's respect during one of their first calls together. Eddie struggles to juggle the life of a single dad to a kid with special needs, as well as the long work hours as a firefighter. Buck introduces him to Carla Price, the home nurse of Abby Clark's late mother, Patricia, and she becomes a nanny and friend for the Diazes.
Shannon returns to Eddie's life when he needs her in order to get Christopher into a school for special needs kids. They start sleeping with each other in secret for two months, with Chris being unaware of her presence. Eddie is hesitant to let Shannon see him due not trusting she won't walk out on them again. She eventually reunites with Christopher on Christmas Day and the three of them fall into a routine. As they wonder where their relationship stands, Shannon thinks she might be pregnant which makes Eddie want them to be a family again. At a dinner, Shannon reveals she isn't pregnant and thinks they should get a divorce, as she is still learning to be a mother. However, Shannon is hit by a car and dies on the way to the hospital.
In the third season, Eddie leaves Christopher with Buck, as the latter couldn't go back to work due to the bombing injury. A tsunami hits L.A. and the 118 helps the victims, unaware Buck and Chris were out on the boardwalk when the wave hit. Eddie meets firefighter Lena Bosko (Ronda Rousey) and befriends her. At the end of the night, Eddie finds Buck, who is about to tell him he lost Chris, before a woman had found him. The next day, Eddie drops Chris off again at Buck's loft to babysit. Eddie joins an illegal fight club to cope with his anger over Shannon's passing, and gets arrested after knocking one of his opponents out. He also struggles to help a Christopher deal with his trauma over his near-death experience with the tsunami.
In the fourth season, a sniper targeting firefighters is on the loose and Eddie is shot in the shoulder. Buck and some other firefighters manage to save Eddie and get him to the hospital. After the sniper is caught, Eddie reveals to Buck he updated his will. He named Buck to be the legal guardian of his son Christopher, as Eddie trusts him the most to take care of him if he died.
In the fifth season, Eddie starts experiencing panic attacks due to a multiple of things such as the thought of commitment to his then girlfriend, Ana Flores, and his shooting. In "Brawl in Cell Block 9-1-1", he and Buck are taken hostage by two escaped prisoners, which leaves Eddie shaken by the end of the episode. In the episode "Wrapped in Red", Christopher gets obsessed with having a perfect Christmas and expresses his fear of Eddie being dead next year. This leads to Eddie making an impulsive decision by quitting the 118, thinking about what's best for his son. He ends up joining the call center as a liaison, which he doesn't really enjoy. Eddie attempts to return to the 118, but Bobby refuses as he doesn't think he's mentally ready. After some therapy sessions, Eddie tries to reach out to people he saved while in the army, only to find out they all died. Christopher calls Buck when he hears crashing and crying from Eddie's room. It is clear that Eddie is dealing with a lot of grief and trauma, and not properly dealing with it. When the call center catches on fire, Eddie jumps in to help, restoring his passion as a firefighter and rejoins the 118.

### Christopher Diaz

Christopher Diaz (Gavin McHugh) (season 3–present; recurring season 2) is Eddie's son and was born with cerebral palsy, which has not affected his intelligence. He develops a relationship with Buck to the point where Eddie officially makes Buck Christopher's legal guardian in case of anything serious happening to Eddie. He is extremely sweet-natured and shows remarkable empathy with other troubled people. While he seems to have come to terms with the death of his mother (killed in a traffic accident in Season 2), at the beginning to Season 7, he is worried that he has begun to forget her (which Eddie remedies by giving Christopher a letter she had written to Christopher years ago). At the end of Season 7, he leaves to live with his grandparents in Texas upon learning of Eddie's affair with Kim.

## Former main characters
### Abigail Clark

Abigail "Abby" Clark (Connie Britton) (season 1; special guest season 3) was the series' main 9-1-1 operator for the first season. She lived and cared for her mother who had Alzheimer's, which took up almost all of her free time. Feeling stuck and unlucky in finding love, she eventually meets Buck and begins a relationship with him. Abby leaves at the end of season one to travel the world following her mother's passing. She had told Buck she would come back to him, but she never did and he got tired of waiting for her. Abby returns to Los Angeles at the end of the third season and she had gotten engaged to a new man since her departure. She and her fiancé now live in Arizona and they took a train to L.A. The train derails and she calls it into 9-1-1, which was answered by Buck's sister, Maddie. She and Buck reunite at the scene and Abby reveals she is engaged. After saving her fiancé, Buck meets up with Abby to get closure. She explains she had initially intended to come back, but was worried she would lose her sense of self and revert to the person she was before she left. Abby apologizes for Buck finding out about Sam the way he did.
In season 8, it was revealed that Abby's ex she mentions in her voiceover in "Pilot", is Buck's boyfriend at the time, Tommy Kinard. Tommy had said breaking up with her was the only honest thing he did in that relationship, although the breakup left Abby devastated. Tommy unknowingly called Buck the "himbo" that was half Abby's age who dated her after him.
Connie Britton had originally signed a one-year deal with 9-1-1, as she had just finished starring in Nashville and didn't want to do another series right away. As a result, her character was written out at the end of the first season and was replaced by Jennifer Love Hewitt.

### Albert Han

Albert Han (John Harlan Kim) (season 4; recurring season 5; guest seasons 3, 6) is Chimney's half-brother. He had secretly left South Korea to escape his father's authoritarianism and came to Los Angeles to find his half-brother, Chimney. There was rocky, but they were able to patch things up and with Chimney embraced having Albert in L.A. After Maddie moved in, Albert went to live with Buck. Their friendship was strained for a moment after Albert started dating a girl Buck had a bad first date with. A pile up was caused by a drunk driver, which Albert was one of the casualties and ended up in a ditch not far from the scene. He was rescued by the 118 and stayed with Chimney and Maddie while he recovered. Albert is shown to have finished his training for LAFD by the end of season 4, becoming a full firefighter. He is placed in Station 133, and is feeling dissatisfied with the job. Albert finds being a firefighter is a lot harder than he thought and realizes he isn't cut out for the job and quits. He goes back to South Korea and visits Chimney in season 6, bringing their estranged parents along so they can meet Jee.

### Michael Grant

Michael Grant (Rockmond Dunbar) (seasons 1–5) is Athena's ex-husband. The two were married for fourteen years and at first they try to stay married for the sake of their kids. Eventually they amicably divorce after he comes out as gay. He and Athena remain close friends and confidants, and the friendship extends to her new husband Bobby. In season two, Michael, May and Harry are pulled over for seemingly no reason, and the situation escalates and a gun is pulled on the kids. Athena tries seeing things from the cop's point of view, which upsets her family. Michael finds out he has a brain tumor in season three and starts distancing himself from his family to make it easier on them in case he dies. After a camping trip with Bobby and Harry, Michael is persuaded into getting treatment for his cancer so he doesn't miss out on his kids' achievements like May's graduation. The treatment proves to be a success and the tumor shrinks by 30%. Michael eventually meets David Hale, a doctor, and starts dating him. He eventually proposes to him and then decides to go Haiti with him to help with their medical emergencies after the devastating storms of 2021. In season 7, Athena says he and David are in Florida and have since gotten married.
Rockmond Dunbar exited the series midway through the fifth season due to FOX's COVID-19 vaccine mandate and his request for medical and religious exceptions being denied.

### Harry Grant

Harry Grant (Marcanthonee Jon Reis (seasons 1–6) & Elijah M. Cooper (season 7)) (seasons 2–6; recurring seasons 1, 7) is Athena and Michael's son. In the fifth season, Harry is kidnapped by serial rapist, Jeffrey Hudson, as revenge to Athena for arresting him. After his rescue, Harry has trouble coping with his trauma and it causes him to blame both Athena and Michael.
He later goes to live with Michael in Florida, but comes back to L.A. in the series' 100th episode after punching a store clerk and is now wanted by the police.
Marcanthonee Jon Reis portrayed Harry in the first five seasons and declined to return in the seventh season. He was replaced by Elijah M. Cooper.

### May Grant

May Grant (Corinne Massiah) (seasons 2–6; recurring season 1; guest season 7) is Athena and Michael's daughter. She attempts suicide in the first season due to being bullied by some girls in her school. Athena manages to save her in time and she recovers. She and Athena bump heads a lot over their views on life, as well as Athena's job as a cop. After she graduates high school, she decides to take time off before going to college and gets a job as a dispatcher in season four, despite Athena's initial resistance. In season five, May starts a rivalry with veteran dispatcher, Claudette Collins, after the latter continuously ridicules her whenever they worked together. She decides to go to college at USC in the sixth season and quits her job at dispatch.

## Recurring characters

This is a list of recurring actors and the characters they portrayed in multiple episodes, which were significant roles, sometimes across multiple seasons.

### Introduced in season 1

* Mariette Hartley as Patricia Clark, Abby's mother, who suffers from Alzheimer's. She passes away in the penultimate episode of season 1
* Gavin Stenhouse as Father Brian
* Alex Loynaz as Terry Flores, 911 technician
* Cocoa Brown as Carla Price, Abby's mother's nurse and later a nanny/health-aide for Christopher Diaz
* Claudia Christian as Captain Elaine Maynard, Athena's direct superior at the LAPD
* Tracie Thoms as Karen Wilson, Hen's wife, an aerospace industry engineer
* Abby Brammell as Eva Mathis, Hen's substance-addicted ex-girlfriend and Denny's biological mother
* Declan Pratt as Denny Wilson, Hen and Karen's adopted son
* Debra Christofferson as Sue Blevins, 911 call center manager
* Michelle Bernard as Carol Branford, an LAPD officer under Athena's command

### Introduced in season 2

* Chiquita Fuller as Linda Bates, 911 operator
* Bryan Safi as Josh Russo, 911 dispatch's supervisor and training officer and Maddie's friend
* Tiffany Dupont as Ali Martin, Buck's girlfriend who left him off-screen before season 3 premiered
* Jonathan Grebe as John, a paramedic
* Ana Mercedes as Isabel Diaz, Eddie's grandmother
* Devin Kelley as Shannon Diaz, Eddie's estranged wife and Christopher's mother who is later killed in a road accident. In Season 7, Kelley also plays Kim, who is Shannon's doppelganger whom Eddie has an emotional affair with.
* Freda Foh Shen as Anne Lee, who raised Chimney after his mother died.
* Kelvin Han Yee as John Lee
* James Chen as Kevin Lee, Chimney's "brother", who becomes a firefighter along with Chimney and is killed in the line of duty.
* Rick Chambers as Dwight Meyerson, a news reporter
* Lou Ferrigno Jr. as Thomas "Tommy" Kinard, a firefighter with the 118 prior to 2005 up to some time prior to 2018, when he moved to the aerial division with Station 217. He returns in season 7, is revealed to be gay, and begins a relationship with Buck. They later break up.
* Brian Thompson as Captain Vincent Gerrard, the captain of the 118 prior to 2005 up to 2008 when he was dismissed for racial prejudice. He returns in season 7, where he takes over the 118 following Bobby's resignation. He is especially harsh on Buck, but softens up when Buck saves him from a malfunctioning saw. Eventually, he leaves the 118 after helping Bobby and Hen take down Councilwoman Ortiz.
* Brian Hallisay as Doug Kendall / Jason Bailey, Maddie's abusive ex-husband (Brian Hallisay is Jennifer Love Hewitt's husband)
* Megan West as Taylor Kelly, a TV reporter who has an on-off relationship with Buck.
* Danny Nucci as Rick Romero, a detective who Athena occasionally assists.
* Troy Winbush as Nathaniel Greene, Denny's biological father.

### Introduced in season 3

* Chris Wu as Officer Williams, an LAPD officer under Athena's command
* Ronda Rousey as Lena Bosko, a firefighter temporarily assigned to the 118
* Leonard Roberts as Captain Ronnie Cooper
* Theo Breaux as Firefighter Stover
* Joe Pistone as Firefighter Calley
* Peter Jang as Firefighter Logan
* Ashwin Gore as Jamal Momed, 911 Operator
* Sean Kleier as Greg, an armed robber who seduces Josh in order to clone his access card and hold dispatch hostage
* Gabrielle Walsh as Ana Flores, Christopher's teacher in Season 3. She dated Eddie in season 4 and 5, until he broke up with her.
* Sasha Roiz as Lou Ransone, a detective and colleague of Athena, who reappears in season 4 and season 5 and is injured by the serial rapist who attacked Athena.

### Introduced in season 4

* Margot Terry as Nia, a young girl Hen and Karen foster
* Anirudh Pisharody as Ravi Panikkar, a probationary firefighter with the 118 who appears sporadically in season 4, became a regular in season 5
* Marsha Warfield as Antonia 'Toni' Wilson, Hen's mother

### Introduced in season 5

* Vanessa Estelle Williams as Claudette Collins, an outspoken call center veteran, who transfers back to the LA station, intimidating May Grant.
* Bryce Durfee as Jonah Greenway, a new Firefighter/paramedic filling in for Chimney at Station 118, who is later revealed to be a serial killer.
* Arielle Kebbel as Lucy Donato, a new firefighter filling in for Eddie at Station 118.

### Introduced in season 6

* Alfonso Caballero as Noah Carmack, a new intern at the dispatch center who works under Maddie's supervision.
* Edy Ganem as Marisol, Eddie's ex-girlfriend
* Annalise Cepero as Natalia Dollenmeyer, a death doula who Buck dates, and later breaks up with the following season.

### Introduced in season 7

* Askyler Bell as Mara Driskell, a young girl whose parents died due to an overdose and Hen & Karen's new foster (later adoptive) daughter.
* Malcolm-Jamal Warner as Amir Casey, a nurse who lost his wife in the same fire that killed Bobby's family in Minnesota.

### Introduced in season 8

* Callum Blue as Brad Torrence, a TV star who plays a fire captain on the in-universe show, Hotshots.

## Guest stars

The following is a supplementary list of guest stars, some recurring, who appear in lesser roles.

### Introduced in season one

* John Marshall Jones as Dave Morrisey
* Rachel Breitag as Tatiana, Chimney's ex-girlfriend
* Troy Ian Hall as Police Officer
* Doug Savant as Matthew Clark, Abby's brother
* Wolé Parks as Glenn, Michael's ex-boyfriend; later replaced by Reggie Austin in season 2
* Genneya Walton as Laila Creedy
* Brielle Barbusca as Cooper
* Josephine Lawrence as Georgina
* Noelle E. Parker as Brook Nash, Bobby's late daughter
* London Cheshire as Robert Nash Jr., Bobby's late son
* Laura Allen as Marcy Nash, Bobby's late wife
* Colby French as Detective Andy Marks
* Jennifer Aspen as Lorraine, an insurance fraudster and former porch pirate
* Todd Williams as Aaron Brooks, Athena's ex-boyfriend

### Introduced in season two

* Connor Trinneer as Jessie
* Eric Nenninger as Brian
* Ali Hillis as Jen
* T. J. Linnard as Russ
* Romi Dias as Chief Miranda Williams
* Connor Dean as Tucker
* Nev Scharrel as Kat
* Kendra Chell as Ainsley
* Burt Grinstead as Drew Hudson
* Terri Hoyos as Aunt Josephina, Eddie's aunt
* Christine Estabrook as Gloria Wagner, a 911 dispatcher fired for negligence
* Justin James Farley as Bret
* Romy Rosemont as Lola Peterson. Lola returns in the first three episodes of Season 7.
* Daniel Roebuck as Norman Peterson. Norman returns in the first three episodes of Season 7.
* Gino Anthony Pesi as Sal Deluca, a firefighter with the 118 prior to 2008 until he was transferred to the 122 by Bobby for insubordination
* Mark Derwin as Captain Thomas
* Tyler Ross as Brandon Skinner
* Beverly Todd as Beatrice Carter, Athena's mother
* Joseph Lyle Taylor as Marty Collins, the 118's resident mechanic
* Lauren Stamile as Ellie Costas
* Anthony Turpel as Freddie Costas, a serial bomber who tries to kill Athena and Bobby for jailing his late father over an insurance fraud fire
* Michael Whaley as Commander Bowman
* Julian Works as Marvin Chavez, cousin of Mateo Chavez (Austin firefighter, station 126)

### Introduced in season three

* William Russ as Chuck
* Ava Acres as Charlotte
* Brian Tichnell as Max Green
* Elia Cantu as Stacy Green
* Deborah Strang as Adele Summers
* Conor Romero as Jason Summers
* Ellen Hollman as Tara, a domestic abuse victim Maddie tries unsuccessfully to help
* Jordan Belfi as Chase Mackey
* Scott Speiser as Vincent
* Jayson Blair as Jake
* Rumer Willis as Georgia

### Introduced in season four

* Nikki DeLoach as Janell Hansen
* Vanessa Marano as Sydney
* Gregory Harrison as Phillip Buckley
* Dee Wallace as Margaret Buckley
* Leah Pipes as Molly
* Merrick McCartha as Aldous Pate