Leo Fitz (MCU)
Real name: Leopold Fitz
Full name: Leopold James Fitz
Aliases: Agent Fitz
Creator: Marvel Comics
Alignment: Good
First appearance: Agents of S.H.I.E.L.D. Season 1: Episode 1
Place of birth: Scotland
Occupation: Engineer
Relatives: Alistair Fitz (father), Jemma Simmons (wife)
Gender: Male
Race: Human
Height: 5'8" • 173 cm
Weight: 143 lb • 64 kg
Eye color: Blue
Hair color: Brown
Superpowers: Endurance, Intelligence, Intuitive aptitude, Marksmanship, Stealth
Stats: intelligence 100, strength 10, speed 25, durability 25, power 20, combat 80

History:
Leopold James "Leo" Fitz is a former S.H.I.E.L.D. agent and scientist. A genius engineer, he is one of the youngest and most prominent members of S.H.I.E.L.D.'s Sci-Tech division, and inseparable from his research partner and friend (and later wife), Jemma Simmons. He, along with Simmons, was recruited to Coulson's Team and worked with them on all of their missions. While on the team, Fitz became good friends with Grant Ward and Skye. During the HYDRA Uprising, Fitz was an active participant in hunting for John Garrett and the rest of the Centipede Project. He was shocked by the revelation that Ward had been a member of HYDRA all along, and refused to believe it. When Ward was ordered to kill him and Simmons, they were trapped on the ocean floor. They escaped, but Fitz spent a long period of time without oxygen, causing brain damage. As time progressed, Fitz's condition seemed to get better with help and support from his fellow S.H.I.E.L.D. colleagues rebuilding it. Slowly regaining his skills, Fitz was able to get back into doing active field and lab work, and played an important role in the conflicts with Robert Gonzales' S.H.I.E.L.D. faction and during the War against the Inhumans, in which he caused the death of Gordon. However, soon after the war was over, Simmons was swallowed by the Monolith and disappeared. Fitz studied the Monolith for months and with S.H.I.E.L.D.'s help, he went through a portal to a distant planet and rescued her. Although Simmons returned, Fitz was devastated to learn she had met and bonded with the astronaut Will Daniels. Fitz helped Simmons research a way back to the planet, but their work attracted the attention of HYDRA, which forced Fitz go back to the planet to bring Hive back on Earth. There, Fitz learned that Daniels had died and his body was possessed by Hive. Fitz destroyed Daniels' body and returned home, believing the Inhuman was dead. However, the dark Inhuman, Hive, managed to return to Earth. Fitz and Simmons, having become a couple meantime, tried to find a cure to Hive's power of controlling Inhumans' minds. S.H.I.E.L.D. eventually managed to kill Hive. S.H.I.E.L.D. had its new Director appointed by the president after the signing of the Sokovia Accords. Fitz worked with Dr. Holden Radcliffe on developing an Artificial Intelligence called Aida which was designed to serve S.H.I.E.L.D. as a decoy target. He was caught in an explosion with Phil Coulson and Ghost Rider by Eli Morrow and was almost sent into another dimension, but managed to get out. Fitz then helped S.H.I.E.L.D. in their last fight against Morrow. To Fitz's shock, Radcliffe betrayed S.H.I.E.L.D. and used Fitz's technology against S.H.I.E.L.D.. Fitz was captured and his mind was connected to the virtual reality called the Framework where he lived a rewritten life as The Doctor, Aida's lover and HYDRA's ruthless second-in-command. After he created for Aida a machine to become a real person, Fitz left the Framework, traumatized from his behavior there. But when Aida learned Fitz didn't love her back, she planned her revenge on him. S.H.I.E.L.D. eventually succeeded in defeating her. Shortly after, everyone in the team but Fitz were taken by mysterious people. Fitz was then arrested by the army and taken to a black site prison. However, former S.H.I.E.L.D. agent Lance Hunter rescued him and brought him to Enoch, the one who took the team. Fitz decided to go into suspended animation for 74 years to facilitate his rescue of the team. Once in the future, Fitz took up the identity of Boshtok the wealthy Marauder. He managed to break Simmons and Daisy Johnson free from Kasius' enslavement, getting engaged with Simmons in the process. After the team managed to return to the present, however, due to multiple stressful factors, Fitz also experienced a psychic split which enabled his dark personality from the Framework to resurface at times. They continued working on a way to prevent the Destruction of Earth, came into a conflict with Hale's HYDRA cell and later with the Confederacy. In their final battle against Glenn Talbot they succeeded to change the course of history, however Fitz was killed in the process. However, due to the method he used to travel to the future, a younger version of Fitz remained alive, though cryogenically frozen in space.

Powers:
 Fitz has become a very well known agent in the S.H.I.E.L.D. tech community for his technological expertise. Grant Ward's attempt to kill him damaged his temporal lobe, and he temporarily displayed aphasia as a result, a difficulty remembering or explaining words. However, this condition did not affect his intelligence, and Fitz continued being a genius. Over time, Fitz recovered from his brain troubles until he was released from the Framework and his intelligence was used by The Doctor, Fitz's evil self, to devise clever but harsh plans Fitz's true self was unwilling to come by.  Fitz has designed and created many of the equipment commonly used by S.H.I.E.L.D. agents, including the Night-Night Guns and I.C.E.R.s, the Mouse Hole, the Magic Window. He has also created many of the tools used for analysis and scientific work, especially the D.W.A.R.F.s, the Golden Retrievers, the Full-Spectrum Goggles or the Magic Window. The sensitive nature of many mission has made him to develop devices against the clock that needed to be adapted to the parameters of each mission. As such, John Garrett was willing to recruit Fitz into HYDRA to benefit from his engineering abilities. Fitz's expertise also extends to artifacts of Asgardian origin, as his previous experience with the Berserker Staff allowed him to fully repair Lorelei's Asgardian Collar, greatly impressing Sif who considered him "quite clever".  Fitz is able to speak some Arabic and to read Hebrew, aside from his native Scottish-dialect English. He spoke Arabic when he confronted gangsters in Morocco to get to Yusef Hadad. When Fitz opened the scroll casing he had taken from him, he was instantly able to identify the symbol on the scroll as the Hebrew word for "death". However, he did not know that the word also had the meaning "death by punishment".  Fitz was taught how to handle a handgun, and he resorted to use them to repeatedly shot Hive while possessing Will Daniels' body on Maveth, or to kill Giyera using a Cloaked Gun. When he refused to accept Simmons' apparent death, he accurately shot off the locks of the case containing the Monolith with a shotgun. After the Framework, this and his reflexes are greatly increased, as shown when he and Hunter take back the Zephyr, when Fitz, Simmons and Daisy escape Kasius and the bidders, and when going up against Anton Ivanov's Sleeper Mechs along with Simmons. Before this, he was already accurate enough to shoot Holden Radcliffe's LMD in the head.  When Fitz first joined Coulson's Team, he was not a capable fighter. However, through his years of training with the team after joining, he became an adept combatant, being able to fight against a Primitive with great skill. He later fought against members of the Watchdogs using hand-to-hand combat.  Though not at the level of agents like Melinda May or Natasha Romanoff, Fitz was able to convincingly play off that he was 'Boshtok the Marauder', a man who had a reputation for killing many, to Kasius and the bidders from around the galaxy. During this, he used his experiences from the Framework to his advantage to convince the group. In addition, Fitz is able to speak with a perfect American accent and thus can pose as an American rather than a Scottish man.