Jem Asturias

Jemma "Jem" Milagros Asturias is the seventeen-year-old Greek demigod daughter of Poseidon and Daniella Asturias. She is the paternal half-sister of Percy Jackson whom she is very close to. She is the ex-girlfriend of Ronan Sangster and the current girlfriend of Matt Lewis.
==Early Life==
Jem Asturias was born June 20 to Poseidon, the Greek god of the seas, storms, earthquakes, and the creator of horses, and Daniella Asturias, a former surfer, 17 years ago in San Diego, California. Her mother moved them both to New York when Jem was just an infant.
According to Daniella, Poseidon left before either of them knew that she was pregnant. Poseidon had (unbeknownst to others) already broken the pact made by Zeus, Poseidon, and Hades, also known as the Big Three, to avoid having any more demigod children. As the most powerful Olympians, children of the Big Three wield incredible power and are seen as too dangerous to be brought into existence. As Jem grew older, her mother would tell her that her father had been “lost at sea," never confirming whether he was dead or alive.
Daniella never wanted to tell Jem the truth as she was afraid it would attract monsters and she'd be forced to send Jem to Camp Half-Blood where she feared Jem would have to stay.
Jem would start to feel left out as her mother would start taking in foster children. Jem wouldn't realize until later, that while her mother enjoyed giving back to children, she also did this to shield her from the mythical world for as long as possible.
===Meeting Matt Lewis and Early Expulsions===
When she's 10 years old, Jem meets Matthew Lewis at the same boarding school she is attending and the two hit it off so well, that Daniella and Matt's mom, Margot, put them in the same boarding school for the next year, hoping they can keep an eye on each other.
While gifted at music, both Jem and Matt had gained reputations for being troublemakers and getting expelled from different schools. With their ADHD and Dyslexia, the two were written off by many for having "potential" but not the drive to do anything.
===Monster Attack and Camp Half-Blood===
When she's 11 years old, she gets attacked at school and is forced to make the trip from Manhattan to Long Island Sound to Camp Half-Blood where she is told about everything involving the mythological world.
While at camp, everyone keeps trying to figure out who her godly parent is, but with her aptitude for different talents like Archery, Arts and Crafts, Music, and Pegasi riding, no one can figure it out. She remains with the rest of the unclaimed campers in the Hermes cabin.
She tries to contact her mom while at camp, but her mom doesn't respond to her. Jem tries to make the best of the situation by delving into the activities of Camp Half-Blood, but with her aptitude for different activities, other campers start whispering about her. Jem stays close to Matt, trying to ignore the whispers about her.
After she gets injured during her first Capture the Flag game, she meets Ronan Sangster, son of Apollo. Jem couldn't help but notice how cute he is while he heals her wounds. This results in a crush, and casual acquaintance of the two.
==Percy Jackson and the Olympians==
===The Lightning Thief===
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After Percy Jackson shows up at camp and gets put in the Hermes cabin, Jem meets him and they immediately hit it off. Jem tries to make Percy feel better, but because she is also one of the unclaimed, it doesn't do much.
During Percy's first Capture the Flag, Jem is put in a roving battle position and is brought to the creekside by Annabeth to aide Percy in his fight with the Ares kids. Her minor wounds were healed from the leftover fight when she stepped into the creekbed herself. After Capture the Flag, a hellhound summoned from the Fields of Punishment came out of the forest and attacked her and Percy. They both were nearly killed but Chiron managed to shoot the hellhound, killing it. Clarisse tried to blame Percy for summoning the hellhound but Percy denied any knowledge of it. Percy and Jem's injuries from the hellhound healed by touching the water; then suddenly, a holographic trident floated above their heads, which told everyone that they were the offspring of Poseidon, the god of the sea, therefore explaining their powers over water. As the monster was not from the forest, it meant that someone within the camp had summoned it, because nothing, including weather, could enter the camp's magic boundaries without permission. Clarisse said that it was Percy who summoned it but Chiron didn't agree as Percy himself was attacked by the monster (it is later revealed Luke summoned this monster from Tartarus to kill Percy).
Percy is then offered a quest to retrieve Zeus's Master Bolt by Chiron. Chiron explained to Percy and Jem that Zeus lost his master bolt, and since he has a rivalry with Poseidon, he blames Percy and Jem, as Zeus suspects that Poseidon is attempting to use his children to dethrone him because Percy and Jem were in New York (where Mount Olympus was) when the Bolt was lost. Chiron said that if Zeus didn't get his bolt back by that summer solstice, he would begin a war with Poseidon and that would force the other gods to take sides and cause a civil war between the gods. Percy accepts the quest and consults the camp's Oracle of Delphi and getting a prophecy. It storms for the first time at Camp Half-Blood.
It is during this storm that Matt and Ronan find Jem on the beach, overlooking Long Island Sound. Jem tells them both what transpired. She later sees Percy, Annabeth, and Grover off on their quest. She spends the time they're on their quest trying to get used to being alone in the cabin and doing activities.
Since her mom hadn't contacted her by phone, Jem sends her a letter, telling her that she now knows who her father is, that she has a brother and that she just wanted to know why her mom kept all of it from her.
A few days later, she gets a call from her mom where her mom reveals everything to her. Jem then asks if she could come home now and her mom gently tells her no, and that she doesn't know if Jem could survive the whole year with her being a child of the Big Three. Jem is disappointed but puts on a good front.
As soon as she is back on the beach and with Matt, she bursts into tears. Matt comforts her during this moment and they both decide to go back to the Big House to use the piano.
Percy, Annabeth, and Grover go back to Camp Half-Blood, where everyone at the camp congratulates them since they were the first people to return from a quest since Luke. Jem gives Percy a warm welcome back and the two return to their normal routine at camp. Jem knows there is a possibility that Percy will leave back to New York at the end of the summer, but she ignores this, trying to stay happy.
Jem gets a shock when several forest nymphs carry Percy out of the forest. She immediately alerts Chiron and Annabeth and they stay by Percy's bedside while he heals. Percy tells the three of them what transpired in the woods, shocking the three.
Percy decides to go back to New York and Jem bids him goodbye and good luck, making him promise to come back next summer because she couldn't possibly be alone in the cabin. Percy tells Jem to take care of herself and that he'll see her soon.
===The Sea of Monsters===
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After someone poisons Thalia's Tree, Jem takes the initiative to call a truce with Clarisse La Rue and set up a border patrol. Having been alone for the 6 months that Percy and Matt have been gone, Jem and Ronan have gotten a bit closer. Matt shows up at camp a week earlier than expected and Jem is really happy to see him - Ronan is not.
Jem is having a picnic lunch with Matt under the dying tree when the camp is attacked by bronze bulls. She is backed up by Clarisse and eventually with Percy, Tyson, and Annabeth. Percy and Annabeth drive them back with help from Tyson who is fireproof. Percy later learns Thalia's Pine Tree is poisoned, meaning the borders are weakened and the activities director Chiron has been blamed since he is Kronos' son. Clarisse is assigned a quest to go to the Sea of Monsters (using the coordinates Percy received) to find and retrieve the Golden Fleece, which has healing powers for plants, animals, and humans which they need to heal Thalia's tree. Percy, Jem and Annabeth decide to go also, but Dionysus and Tantalus, the new camp director replacing Chiron after he was fired, refused.
Meanwhile, Polyphemus, a Cyclopes, has captured Grover at a bridal shop. Polyphemus believes that Grover is a female Cyclopes (since he is covered with jewels) and he wants to "marry" Grover, for he is wearing a bridal gown. In desperation, Grover creates an Empathy Link with Percy so he can call for help. With Hermes' help, Percy, Jem, Annabeth, and Tyson board the Princess Andromeda, the ship Luke and his forces are on and escape. After escaping from Luke's ship, they fight the Hydra and defeat it with Clarisse's help and get on Clarisse's ship, the CSS Birmingham. The CSS Birmingham is a tribute to Ares and is crewed by the dead who died in a war. As they enter the Sea of Monsters, Clarisse, Tyson, Percy, and Annabeth have to get past Scylla and Charybdis. Scylla lives on a cliff, while Charybdis lives in the middle of the entrance to the Sea of Monsters. Instead of attempting to sail in between the sisters, Clarisse automatically goes for Charybdis, but Scylla appears and wrecks havoc among the crew. Tyson, a good Cyclops and the half-brother of Percy, supposedly perishes in Clarisse's ship after the ship got blown up due to malfunction problems leaving only Percy and Annabeth behind.
Percy, Jem, and Annabeth then journey to many dangerous islands including Circe's Island and the Sirens' Island, and Annabeth tells Percy several stories about Thalia's death, which she also mentions her prophecy. When they reach Polyphemus's island they join up with Clarisse (who managed to survive the explosion), Grover (who had been captured by Polyphemus), and later Tyson, who miraculously survived thanks to Rainbow, a friendly hippocampus who dragged him out of the water. They leave with the Golden Fleece after fighting Polyphemus and defeating and blinding him, which Polyphemus stole many years ago. When they return to the mortal world, they send off Clarisse on an airplane to the camp alone to drape the Fleece on the tree, and Luke kidnaps Percy, Annabeth, Jem, and Tyson, but Percy reveals Chiron's innocence on a secret Iris Message sent to camp which Dionysus responds to by sending Tantalus to the underworld once more and restoring Chiron's job. Percy challenges Luke to a duel, but unfortunately, due to Percy being out of practice and Luke being fully trained and experienced, he soon finds himself to be no match for Luke's polished swordsmanship and is swiftly defeated and very nearly killed by Luke. However, Chiron comes to rescue them with his strangely dressed relatives and they manage to chase off Luke and his allies. When they return to camp, the fleece is placed on the tree, which not only revives it but also brings Thalia back to her full life form. This revival was actually Kronos' plan, done so that he would have another chance to manipulate the prophecy that governs the future of Olympus and the Olympians.
Before camp ends, Jem receives a call from her mother. Daniella has been in touch with Sally, Percy's mother and they both agreed that they would enroll them both in the same school for the upcoming semester, much to Jem's delight. Jem then leaves camp with Percy and Matt by her side.
===The Titans's Curse===
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Thalia Grace, Percy, Jem, and Annabeth heard from Grover that two half-blood siblings, Bianca and Nico di Angelo, had been found in a middle school. The three immediately set out to find him. Grover had been waiting for their appearance. He explained that he found the two half-bloods and that they were enjoying a function in the gym. While dancing with Thalia and Grover, Annabeth comes and says the half-bloods are in trouble and they need to hurry. Percy had disappeared to go after the half-bloods and manticore so the rest of them hurry to find them. Percy felt disgusted by the fact that Thalia was always powerful and a hero at everything she'd done and so thought it was now his time to shine and ran to save the di Angelos from danger alone, though his plan did not work out as planned and he, Grover, Jem, and Annabeth were nearly killed by Dr. Thorn.
Then, Artemis and her Hunters appear and Annabeth falls from a cliff as she had climbed on Dr. Thorn with her knife before the Hunters shot him down with their arrows. Being a daughter of Poseidon, Jem did not feel Annabeth dropping into the water, which confirms the fact that she had been captured. The Hunters saved Jem and her friends from the manticore. Artemis then sends her Hunters to Camp Half-Blood with Apollo, her twin brother.
Jem meets up with Ronan and Matt, telling them everything that happened. Though they both remain optimistic, there is still an air of upset over what happened to Annabeth. While Jem leans on Ronan for support, Matt becomes stoic.
After a few days, the camp had a Capture the Flag game, where the Hunters were up against the campers. Thalia and Percy agreed to be co-captains of the demigod team while Zoë Nightshade led the Hunters. During the game, he learned from Grover that Zoë had a bad dream about Artemis being in trouble, while Percy himself had a dream that Annabeth was suffering under the weight of some unseen object (later revealed to be the sky). Thalia told Percy to stay on defense to guard the flag, but when he saw that her team was about to be attacked, he ran up the middle and took the flag. On his way back, he saw Zoë running back with his team's flag and was tripped up by an arrow two feet from the line, allowing the Hunters to win.
Thalia then runs up to Percy, asking him what he was thinking as when she got to the flag's spot, it was gone. She then shocks him with Electrokinesis but claims it was an accident and apologizes. Percy, angry uses the creek water to splash her and claims that it was also an accident. Thalia and Percy begin to fight, each one summoning stronger attacks until Percy stops, seeing the Oracle walking towards them. Percy simply watched as the Oracle approached Zoë, who asked about saving Artemis. The Oracle replied with a prophecy, saying:
Five shall go west to the goddess in chains,
One shall be lost in the land without rain,
The bane of Olympus shows the trail,
Campers and Hunters combined prevail,
The Titan's curse must one withstand,
And one shall perish by a parent's hand
Chiron then holds a meeting to decide who will go on the quest. Zoë originally wanted to take all Hunters, but she is convinced to allow a few campers as it was in the prophecy. Zoë, however, doesn't pick Percy because he is a boy, as Zoe thinks it's horrible to be with a boy, instead picking Thalia and Grover, as well as her own Hunters, Bianca di Angelo, and Phoebe.
==Appearance==
Jem has olive skin, light brown hair, and amber-brown eyes. Her hair naturally falls in beach waves and is said to darken during prolonged sun exposure.
Jem usually wears a variety of t-shirts, skinny jeans, and laced-up combat boots.
Ronan Sangster stated that Jem's fingertips were covered in calluses due to her guitar playing and her hair seems to hate being constrained "just like her".
According to Matt, her smile is one that "can warm even the coldest hearts". He then goes on to say that she's most beautiful after she's been caught in a storm "with her hair weighed down by the rain and her amber eyes sparkling like stars in the sky."
After taking a peek in Matt's songbook, Percy mocks Matt for describing Jem's voice like "A siren".
==Personality==
==Abilities and Tools==
===General Abilities===
*ADHD: Jem's supernatural alertness and keen senses that keep her ready for, and alive, in battle. It also lets her analyze her opponents fighting style as well as pick up minor details about an opponent, such as where their muscles tense so she can tell which direction they will attack from.
*Dyslexia: Jem's brain is "hard-wired" for reading divine Ancient Greek instead of mortal languages.
*Archery: Jem is a naturally talented archer. Her skills continue to grow as time passes, capable of holding her own against and defeating more experienced, and more powerful opponents, including being roped in with Apollo cabin archers.
*Dreams: Like most demigods, Jem had dreams that showed her events occurring in the past, present, and future. However, due to her father's unpredictable nature and raw power, Jem's dreams are a lot more potent than those of other demigods.
*Superhuman Durability: Being a demigod daughter of one of the Big Three, Jem is more durable than regular humans and fellow demigods.
*Superhuman Strength: Being a demigod daughter of one of the Big Three, Jem is considerably stronger than a regular mortal and demigod. She can knock out demigods with one hit.
*Superhuman Reflexes: Being a demigod daughter of one of the Big Three, Jem's reflexes are faster than a regular human.
*Superhuman Agility: Being a demigod daughter of one of the Big Three, Jem is more agile than a regular mortal.
*Pattern Recognition: Jem is shown to be able to follow things occurring in a pattern, even using this in her own musical ability and fighting. 
===Demigod Abilities===
As a daughter of Poseidon, Jem is an extremely powerful individual and one of the most powerful demigods in the series. The only other demigods whose powers rival hers are her brother, Percy, Thalia Grace, Nico di Angelo and Jason Grace.
*Hydrokinesis: Jem can control great volumes of water to a very high degree. She can dry herself and items underwater as long as she holds onto it, extract water from petrified seashells, create oxygen bubbles underwater for people who cannot breathe underwater, propel herself through water, summon waves that can easily sink ships, as well as control water in order to make it explode or use it to grab something. In The Demigod Files, she (with help from Percy) managed to lift the River Lethe with some struggle.
**Water Solidification: Jem can harden water into an almost solid shape by increasing the surface tension of the water. She can use this power to walk on water and create a strong water shield.
**Hydrogenesis: Jem can create water from her own power by summoning the "force of the ocean" inside of her as long as she concentrates hard enough, though it takes much of her energy for her to do so. She learned this ability from Percy after the latter was taught how to by a Naiad. While traveling on the Argo II during The Mark of Athena, she presumably used this ability while combining her powers with Percy and Jason's to create powerful storms.
**Water Empowerment: When in contact with or in the presence of water, Jem gains a disproportionate amount of superhuman clarity, strength, speed, agility, and endurance. This is shown by her willingness to sit out in a rainstorm, feeling better just by being under the water.
**Water Immunity: If she falls from great heights into water, Jem will be unaffected by any amount of water pressure. She doesn't get wet if submerged in water unless she wants to. Additionally, Jem can breathe underwater for unlimited amounts of time and see in the darkness underwater.
**Cryokinesis (limited): Jem can use cryokinesis to a small degree. She can manipulate frozen or icy water around her.
**Vitakinesis (limited): Jem can heal most wounds and cure most poisons when in contact with water, the amount of water and time needed for the healing being proportionate to the severity of the wound. However, due to Percy's experience with Pit Scorpion venom, it may not apply to everything.
**Heat Immunity (limited): Jem has a higher than normal resistance to heat burns, due to her father's nature.
*Watercraft Manipulation: Jem possesses an intimate awareness of any ship she is on (sailing ships, canoes, motorboats, possibly submarines) and can telekinetically operate one, although she has so far only shown control over sailing vessels and similar boats. Both Jem and Percy discover this power when they are able to control the Queen Anne's Revenge in The Sea of Monsters. In The Mark of Athena, Percy and Jem are able to control the Argo II, releasing the dock ties, weighing the anchor and unfurling the sails as Annabeth fires the engine.
**Nautical Senses: Jem always knows her exact nautical coordinates wherever she is, which allows her to easily navigate her way at sea.
**Instinctive Understanding of Sailing: In The Sea of Monsters, Jem and Percy discover that they have an instinctive understanding of sailing while controlling the Queen Anne's Revenge, letting them know which ropes to hoist, which sails to raise and which direction to steer. They could even detect that they are moving at about ten knots and understand just how fast that is.
*Geokinesis (limited): Jem has utilized water to alter the earth around him. However, in Percy Jackson's Greek Heroes, Percy admits that though he did not inherit his father's earthshaking abilities, Jem is starting to test out her abilties.
*Communication: Jem has divine authority over her father's subjects. She can talk (normally and telepathically) to equines and sea creatures who mainly treat Her with deference and respect. She can also speak to other children of Poseidon underwater as seen in The Sea of Monsters, in a conversation with Tyson and Percy. In The Mark of Athena, when Frank Zhang shapeshifts into a koi, Jem is also able to communicate with him in this fashion.
**Zoolingualism (limited): Jem can understand and talk to marine animals, equines, and similar creatures, who mainly treat her with deference and respect.
===Magical Items===
==Relationships==
===Love Interests===
====Ronan Sangster====
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Ronan and Jem met at Camp Half-Blood sometime during the year she was there before Percy came to camp. She developed a crush on him after he helped heal her after her first Capture the Flag game.
After she is claimed in The Lightning Thief, Ronan is one of the few campers who didn't ice her out. She thanks him for still being nice to her, despite everything, and the two talk for a bit.
Between The Lightning Thief and The Sea of Monsters, Ronan bears witness to Jem's musical ability and praises her for it as an Apollo kid with very limited musical talent. He does mention that he has some talent in dance through his godly parent. She offers to teach him some musical abilities in exchange for him teaching her some more about healing others. They promise to write to each other when Jem goes back to Manhattan for school.
In The Titan's Curse, the two start developing a relationship, much to the dismay of Jem's best friend, Matt Lewis. They are officially dating at the end of the book, and continue to write to each other.
They continue to date throughout The Battle of the Labyrinth, Ronan and Matt teaming up to hold down the fort at Camp Half-Blood while Jem, Percy, Annabeth, Grover, and Tyson all head into the Labyrinth. Jem sees Matt and Ronan at camp through her dreams at the same time she is worrying about him and Ronan. Matt is the first person to comfort her when she thinks Percy has died in an explosion. Because of this, Jem and Ronan then fight about her closeness with Matt to which Jem tells Ronan that in order to be with her, he has to accept Matt as part of her life.
At the end of the book, both Jem doesn't invite Ronan to attend Percy's birthday party.
They have very limited interactions with each other in The Last Olympian as Jem fights alongside Matt while Ronan acts as a field medic alongside his brother, Will Solace.
In The Lost Hero, a withdrawn and sad Jem is seen with Matt so much that Leo wonders if the two are dating. Piper sees Jem, Matt, and Ronan at one point at camp and wonders what the dynamic is between the three as they gave off "very weird vibes".
In The Dynamic Duo storyline of The Demigod Diaries, Annabeth answers an unspoken question by Jason, Leo, and Piper when they all watch Jem and Matt rehearse music together, telling them that Matt has been in love with Jem for a long time. When Leo inquires about Ronan, Annabeth uncomfortably shifts and just says "it's complicated".
In The Mark of Athena, Jem Iris messages Matt a few times while aboard the Argo 2 and Matt implies there is some tension between Jem and Ronan, but Jem changes the subject.
In The House of Hades, when at Salona, Cupid taunts Jem, Jason and Nico at the temple, telling Jem that her "heart is torn even after all these years." In Jem's view of Cupid, the god manifests himself as the person she desires and she contemplates the war in her chest when he shifts into Matt instead of Ronan.
In The Blood of Olympus, during her quest with the Athen Parthenos, Jem contemplates her feelings and her relationship with Ronan throughout her trek across the ocean.
As of Demigod Adventures, Jem and Ronan have seemingly broken up.
====Matt Lewis====
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Jem and Matt met each other at school when they were ten years old. Their mothers got along really well and they decided to enroll the two in the same school the next school year. When they're both attacked by monsters, they find their way to Camp Half-Blood and are taken in by the Hermes cabin. Matt gets claimed by Hermes almost immediately after arriving at camp, but Jem isn't.
Jem and Matt continue to confide in each other throughout the series. They have their first real blowup fight during the events of The Titan's Curse. When Jem confides in Percy later, Percy is the first to tell Jem that Matt is jealous of Ronan since Matt has been in love with Jem for years. This takes Jem aback a bit and she vehemently denies it.
In the The Battle of the Labyrinth, Jem sees Matt at camp through her dreams at the same time she is worrying about him and Ronan. Matt is the first person to comfort her when she thinks Percy has died in an explosion. Jem and Ronan then fight about her closeness with Matt to which Jem tells Ronan that in order to be with her, he has to accept Matt as part of her life.
At the end of the book, both Matt and Jem attend Percy's birthday party where Matt meets Poseidon for the first time. After it is revealed to Paul about Jem and Tyson's parentage, Paul joke asks Matt if he is somehow also related to them to which Matt responds not technically.
In The Last Olympian, the two are seen fighting side-by-side for some time and he is usually the first one she sees after she's been injured and the battle was over. She then mentions that they both were going to have an awesome time writing music together for the next school year.
In The Lost Hero, a withdrawn and sad Jem is seen with Matt so much that Leo wonders if the two are dating. Piper sees Jem, Matt and Ronan at one point at camp and wonders what the dynamic is between the three as they gave off very weird vibes.
In The Dynamic Duo storyline of The Demigod Diaries, Annabeth answers an unspoken question by Jason, Leo and Piper when they all watch Jem and Matt rehearse music together, telling them that Matt has been in love with Jem for a long time. When Leo inquires about Ronan, Annabeth uncomfortably shifts and just says "it's complicated".
In The Mark of Athena, Jem Iris-Messages Matt a few times while aboard the Argo 2 and Matt implies there is some tension between Jem and Ronan, but Jem changes the subject. Jem starts to reflect on her friendship with Matt and looks back at all of the times they've spent together.
In The House of Hades, when at Salona, Cupid taunts Jem, Jason and Nico at the temple, telling Jem that her "heart is torn even after all these years." In Jem's view of Cupid, the god manifests himself as the person she desires and she contemplates the war in her chest when he shifts into Matt instead of Ronan.
In The Blood of Olympus, Jem fights side-by-side with Matt and they joke when they reunite.
Between Heroes of Olympus and Chalice of The Gods, Matt is going to Goode High School with Jem.
In Demigod Adventures, Jem has since broken up with Ronan and is trying to sort out her feelings for Matt. She tries to take advice from Piper McLean, Daughter of Aphrodite who suggests that she tries to use the same communication she's always used with Matt to tell him how she feels―music.
Matt and Jem share a moment while singing which causes Matt to storm out of the room. When Jem confronts him about it, Matt lays out to her how much she has hurt him with her playing with his feelings.
After a few days, Jem apologizes to Matt and the two make up.
A few days after that, Matt serenades her with a song and the two kiss.
In Chalice of the Gods, Jem and Matt are wearing matching GHS Music Program shirts and they both talk about their plans to live in New Rome while going to college.
In The Sun and the Star: A Nico di Angelo Adventure, Jem and Matt are said to be living in New Rome with Jem going to UC Berkley and Matt to New Rome University.
===Friends===
====Annabeth Chase====
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Annabeth Chase is one of Jem's closest friends. According to Jem, Annabeth was one of the first friends she made at Camp Half-Blood.
The two girls become even closer after The Last Olympian once Jem's half-brother, Percy Jackson and Annabeth start officially dating. When Percy disappears a few months later, Annabeth starts coming over to Percy's house with Jem, both of them worried sick about what happened to Percy.
====Grover Underwood====
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Grover becomes one of Jem's closest friends the more Jem interacts with the trio. It is mentioned that Grover was originally going to be assigned to Jem's school before Percy's, but Jem managed to find Camp Half-Blood before this.
The two joke later to Annabeth and Percy that they will always have two things in common: music and being a third-wheel to Percy and Annabeth.
====Nico di Angelo====
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Nico and Jem met in The Titan's Curse after rescuing him from Westover Hall. As Nico and Jem get to know each other, she feels bad for Nico after Bianca abandons him and joins the Hunters of Artemis. She looks after him while Bianca and Percy go on their quest to save Artemis.
Jem tries to reach out to Nico after she learns of his sister's death, but he runs away from camp. Percy and Jem searched for Nico all spring, to no avail.
During The Battle of the Labyrinth, Jem has dreams about Nico and feels bad for him. While searching for Daedalus in the Labyrinth, Jem runs into Nico at the Triple G Ranch. Nico becomes furious at Percy and orders him to go away, and thinks he will kill him. Percy calms down when he finds out that he wasn't planning to kill him, after Nico said Bianca's soul is worth more than his. He completes a job for Geryon to free Nico, even at the risk of Percy having to stay there himself if he fails. 
Jem and Nico were reunited at Daedalus' Workshop and Nico apologized to Percy, saying he was tricked by Minos and wanted to save him. Nico then saved Percy and the others by declaring himself the ghost king, finally becoming friends.
In The Demigod Files, Jem and Nico meet again with Percy Jackson and Thalia Grace when the four of them are summoned and sent to the Underworld by Persephone. Nico was amazed at Percy and Jem when they controlled the River Lethe and helped heal him after. After the quest was over, Jem, Nico, Percy, and Thalia said their goodbyes on a balcony, and Nico decided to stay in the Underworld to help his dad.
In The Lost Hero, Annabeth mentions that he is helping everyone looking for Percy.
In The Mark of Athena, Percy dreams of Nico and finds out he was imprisoned in a bronze jar. However, while others had mix feelings about rescuing him, Jem and Hazel are the only two who are adamant about saving him. In Rome, she helped rescue him with Percy, Jason, and Piper, and was the most determined out of the four to rescue him.
In The House of Hades, Jem, Nico, and Jason all meet the god Cupid where Nico is forced to reveal that he had a crush on Percy this whole time. Jem goes out of her way to tell him that everything's going to be okay. When back on the Argo II, Jason asks why Jem doesn't seem surprised by the revelation, and Jem says she's had suspicions for a while, but that it was Nico's business and not hers or anyone else's business to tell.
In The Blood of Olympus, Jem tags along the Athena Parthenos quest with Nico, Reyna, and Gleeson Hedge. Reyna notes how protective and caring Jem is over Nico almost like an older sister to him. When Reyna asks her about it, she admits how she's always seen the people she cares about as people she needed to protect. Jem continues to try to take care of Nico and tags along with him to distract the Roman legion who were trying to infiltrate Camp Half-Blood.
In The Sun and the Star: A Nico di Angelo Adventure, Nico is shown to be in constant contact with Jem who checks in a lot and is approving of Nico and Will's relationship.
====Thalia Grace====
====Jason Grace====
====Piper McLean====
====Clarisse La Rue====
====Hazel Levesque====
====Reyna Ramírez-Arellano====
====Leo Valdez====
===Family===
====Daniella Asturias====
====Poseidon====
====Percy Jackson====
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Jem is very close to her paternal half-brother, Percy even invited Jem and her mom to the holidays with him, Sally, and Paul. The two met at Camp Half-Blood during Percy's first summer as they were both stuck in the Hermes cabin together. Though Jem at first holds resentment for her only being claimed when Percy gets to camp, she decides that she's better off trying to get to know her brother. Percy making it in the mortal world as a child of the Big Three the year before The Sea of Monsters gives Jem's mom the confidence that Jem too can survive in the mortal world so long as she goes to camp every summer.
Percy and Jem end up being enrolled in some of the same schools as they both end up attending Goode High School before Percy is kidnapped by Hera and disappears for eight months. This greatly worries Jem and the two have a happy reunion when Jem tags along on the Argo 2 and they land in New Rome.
====Tyson====
==Etymology==
*Jemma: A female given name and variant spelling of Gemma, meaning "gem" or "precious stone".
*Milagros: Means "miracles" in Spanish. It is taken from the title of the Virgin Mary, Nuestra Señora de los Milagros, which means "Our Lady of Miracles".
*Asturias: From the name of a region in Spain, formerly a medieval kingdom. It is possibly derived from Basque asta "rock" and ur "water".
==Trivia== 
*Her first and only plane ride was when her mother moved them from San Diego to New York
**As the sky is Zeus's domain and therefore treacherous to Poseidon's children, Jem and her mom avoided the sky for a long time
*Despite being dyslexic, Jem can read sheet music
**It is also implied that her mother had her take music lessons at one point
*She is an avid surfer but admits that surfing was her mom's thing and she will never be as good as her (despite her godly heritage)
*Because she is so good at Archery, many people believed for a second that she was a child of Apollo.
**In The Trials of Apollo, Apollo praises her archery skills even though "archery has never been [Poseidon’s] strong suit."
**Many also believed in the "child of Apollo" theory because of Jem's musical ability.
*Jem is shown in Chalice of the Gods to still be going to Goode High School as she is shown wearing a GHS Music Program sweatshirt.
*While she followed Percy and Annabeth to New Rome, she was enrolled with UC Berkeley's music program
**This is also why she didn't have to get any godly recommendation letters as a forbidden child of the Big Three
*There were many different talents and traits she possessed that made it almost impossible to tell her godly heritage
**She is an avid archer with a reputation of having aim equal to Apollo's Cabin (Apollo)
**She's good with her hands (Hephaestus)
**She enjoys being in thunder, lightning, and rain storms (Zeus & Poseidon)
**She is an excellent pickpocketer (Hermes)
**She is decent with a spear (Ares)
*Jem and Matt conduct their music sessions on the back porch of Cabin 3.
Category:Greek Demigods