Portrayed by Iain De Caestecker
Full Name Leopold Fitz
Age 26
Height 5'8"
Build Slender
Eyes Blue
Hair Brown
Factions S.H.I.E.L.D.
Occupation Engineer, Weapons tech
Alignment Hero

Claim to Fame

Leopold Fitz is one of the brightest scientists and engineers in the world.


Outside of S.H.I.E.L.D., not much is known about Fitz outside of his home town in Scotland. Within the organization, however, he's known as one of their youngest, best, and brightest engineers. Many an agent would love to have him on the team, but you'd better not separate him from Simmons, or you'll have a mess on your hands.


Leopold "Leo" Fitz was born in Scotland, United Kingdom. His only known relative is his mother. As he grew up, it became quickly apparent that he possessed a genius-level intellect, and worked his way through school quickly, graduating two years ahead of others his age.

He was recruited by S.H.I.E.L.D., given citizenship, and attended the organization's Academy of Science and Technology. It was there where he became friends with the equally-intelligent, bio-chem expert, Jemma Simmons. They soon became best friends, the attached-at-the-hip type, and eventually earned the nickname 'Fitzsimmons' from their peers.

Both Fitz and Simmons graduated from the academy three years early. Fitz would have been happy to spend all of his time in a lab. However, at the urging of Simmons (and against the advice of Professor Vaughn), the pair put in for a field position.

Character Details

Leopold Fitz is somewhat socially awkward, and he's virtually joined at the hip to his best friend, Jemma Simmons. In spite of his awkwardness, he occasionally surprises others with a clever wit and dry sense of humor. He also has a strange affinity for monkeys.

In spite of his lacking in the combat arena and field experience, he possesses a remarkable level of bravery. While he can be scatterbrained, he is also an extremely quick thinker. He believes deeply in the friendships he creates, and is loyal to the core. He also holds a deep rooted belief that all villains are redeemable, and that people are never "born evil". Thus, he tends to be quick to forgive and understanding of others' problems.

Fitz also tends to go through with his promises… and his threats. If given to violence, you may not need to worry about his fists, but you'd damn well better worry about what he creates.

In spite of what others might think, his relationship with Jemma Simmons has been and very well may always be completely platonic. He cares about her like a twin sister, and he would do anything for her, but romance has always simply been, well, not a factor.


Image Name Relation Information
comuxphil.jpg Agent Coulson Boss Senior Agent, very pleasant person. Much less intimidating than Agent May.
Image Name Relation Information
May2.jpg Agent May Boss My superior and… bloody hell, don't cross her, or piss her off, or break any rules around her!
Image Name Relation Information
tumblr_m96j7aPXKt1qm8fi6.jpg Darcy Lewis Co-worker A junior agent. No filter. Kinda cute, but a little weird. I think she's boy crazy.
Image Name Relation Information
Hawkeye.jpg Agent Barton Co-worker Special Agent, likes to use bows and arrows. Technologically loaded arrows. Developing special arrowheads for this guy is going to be an absolute joy.
Image Name Relation Information
simmons.jpg Simmons Joined at the hip Best friend, went to the academy with her. She's bloody brilliant, and a total pain in the arse.


Image Type Night-Night Gun (Rifle)
NightNightRifle.png Projectile Weapon The Night-Night Gun is a prototype tranquilizer rifle manufactured by Jemma Simmons and Leo Fitz. The rifle fires non-lethal bullets with heavy stopping power that break up under the subcutaneous tissue. From there, the bullets deliver a tiny amount of dendrotoxin, incapacitating the target long enough for them to be secured and with no harmful side effects. (Not Cleared for Field Use)
Image Type Golden Retriever drones (aka 'seekers')
GoldenRetrievers.jpg Automated Drone The "Golden Retrievers" are mobile independent tracking drones created by Leo Fitz and Jemma Simmons. These independent, airborne tracking devices disperse in different directions while searching for their programmed target. They scan for visual data, scent, heat signatures and biological signatures, and are also equipped with a debilitating "scream mode".
Image Type D.W.A.R.F. drones
DWARF.png Operator-controlled Drone The D.W.A.R.F.s (Drones Wirelessly Automated to Retrieve Forensics) are a set of quad-copter robotic drones custom designed by Leo Fitz and Jemma Simmons to seek out, analyze and scan forensic evidence at S.H.I.E.L.D. hot-spots. The drones are controlled from a specially designed tablet from which the operator can control the drones movements and organize, classify and prioritize the incoming data.
Image Type Mouse Hole
Mouse_Hole.png Cutting Tool The Mouse Hole is a portable cutting device capable of cutting through almost any material. It was created by Leo Fitz, but never went to production for field agents. (Not Cleared for Field Use)
Image Type Full-Spectrum Goggles
Fullspec.png Tactical Eyewear The Full-Spectrum Goggles are a pair of goggles developed by Leo Fitz. They are used to visualize the whole electromagnetic spectrum from infrared to near-ultraviolet.

Specially Designed Archery Munitions

Name Description
G-Pegger An arrowhead that bears a micro-GPS tag. (Currently in design stage)
Retriever Tag An arrowhead that bears a tag designed to sync up with the Golden Retrievers (aka 'seekers'). (Currently in design stage)
Nerve Jacker Designed to temporarily stun the nervous system. (Currently in design stage)
Dendro-Tip Designed to deliver a debilitating dose of dendrotoxin. (Currently in design stage)

Character Gallery


World on Fire: The Central Axis (2015)
April 2, 2015: Monsters, time travel, tears in spacetime. Just another Thursday in New York.
(log: 20150402-world-on-fire:the-central-axis-2015 | tags: captain_america corvinus edwin_jarvis fitz howard_stark kara meggan paul_manning peggy_carter simmons witchblade world_on_fire | posted: 04 Apr 2015 18:21)

Holo-Mario Brothers 3
March 28, 2015: Fitz and Skye bond over a holographic game of Super Mario Bros 3.
(log: 20150328-mario-3 | tags: fitz shield skye | posted: 29 Mar 2015 10:04)

World on Fire: The Talking Horror
March 23, 2015: A warped creature comes through another portal - but this one can communicate.
(log: 20150323-world-on-fire:the-talking-horror | tags: booster_gold fitz paul_manning simmons witchblade world_on_fire | posted: 04 Apr 2015 16:23)

Why So Much Power
March 22, 2015: Jericho arrives at the Triskelian to discuss his findings. Simmons briefs everyone on what she found out at Stark Industries
(log: 20150322-whysomuchpower | tags: aspect emmett-argyle fitz paul_manning simmons skye the_cavalry witchblade | posted: 23 Mar 2015 21:39)

World On Fire: Missing Persons And The Math
March 15, 2015: Howard Stark visits The Triskelion to speak with FiztSimmons
(log: 20150315-missingpersons | tags: fitz howard_stark paul_manning simmons the_cavalry witchblade world_on_fire | posted: 16 Mar 2015 12:03)

The Short Artificially Lit Tea Time Of The SHIELD
March 13, 2015: Various SHIELD agents come and go, talking about various things over coffee and tea. There are no pastries or cucumber sandwiches.
(log: 20150313-the-short-artificially-lit-tea-time-of-the-shie | tags: black_widow emmett_argyle fitz paul_manning shield simmons the_cavalry witchblade | posted: 14 Mar 2015 15:50)

It's Not Easy Being Green
March 11, 2015: FitzSimmons and Steve go over what was recovered from the Central Park Zoo incident, finding that something strange is happening on the island of Manhattan.
(log: 20150311-it-s-not-easy-being-green | tags: captain_america fitz peggy_carter simmons world_on_fire | posted: 13 Mar 2015 03:47)

World on Fire: Water For Elephants
March 10, 2015: Another energy surge puts the patrons of the Central Park Zoo in danger of more mutated creatures. Manhattan's heroes come to the rescue and try to find out more about what is happening.
(log: 20150310-world-on-fire:water-for-elephants | tags: booster_gold captain_america fitz peggy_carter power_girl simmons supergirl witchblade world_on_fire | posted: 13 Mar 2015 01:08)

Warped DNA
February 25, 2015: Fitz and Simmons analyse the data collected from Rum Row and come up with theory (backdated scene)
(log: 20150310-warpeddna | tags: fitz simmons world_on_fire | posted: 09 Mar 2015 23:02)

Helicarrier Hijacking: Heart of the Beast
March 01 2015: A team of SHIELD agents and helpful outsiders breach the corrupted Insight to seek out the heart of the problem and put an end to it.
(log: 20150301-helicarrier-hijacking:heart-of-the-beast | tags: aspect fitz magik new_york shield the_cavalry witchblade | posted: 03 Mar 2015 06:28)

Runes and The Portal Gun
February 28 2015: Jericho brings May and Fitz to see Zee about
(log: 20150228-poweringtheportalgun | tags: aspect fitz the_cavalry zatanna | posted: 03 Mar 2015 00:41)

World on Fire: Rum Row
February 24th, 2015: On a cold Tuesday night, a few people go out for a drink and instead run into two monsters that lead to a whole lot more questions.
(log: 20150224-world-on-fire:rum-row | tags: booster_gold captain_america connor_hawke fenris fitz peggy_carter simmons supergirl world_on_fire zola | posted: 26 Feb 2015 00:37)

Guardian Power Supplies
February 16, 2015: Aspect takes May and FitzSimmons to retrieve that power source
(log: 20150216-guardianpowersupplies | tags: aspect fitz simmons the_cavalry | posted: 17 Feb 2015 09:33)

Howard's 11: Party Busters
February 09, 2015: SHIELD operatives close in on some wanted individuals connected to the theft of Howard Stark's old inventions. (Some language)
(log: 20150209-howard-s-11:party-busters | tags: black_widow fitz hawkeye howard_stark maria_hill shield | posted: 10 Feb 2015 19:59)

Howard's 11: Theoretical Betrayal
February 08, 2015: Hill's team makes final plans for the sting, and Howard's loyalties come into question.
(log: 20150208-howard-s-11:theoretical-betrayal | tags: black_widow fitz howard_stark maria_hill shield | posted: 09 Feb 2015 00:59)

FitzSimmons In Limbo
February 3, 2015: Somehow FitzSimmons end up in Limbo speaking with Jericho and Illyana
(log: 20150203-fitzsimmonsinlimbo | tags: aspect fitz k'nert limbo magik simmons | posted: 04 Feb 2015 06:56)

Howard's 11: Portalbusters
February 02, 2015: Hill and Widow discuss their strategy with Howard, while Fitz shows off his shiny new 'Portal Buster'.
(log: 20150202-howard-s-11:portalbusters | tags: black_widow fitz howard_stark maria_hill shield | posted: 03 Feb 2015 16:17)

Solution is up in the air
February 01, 2015: The Hawkeyes brings Dr. Fitz up to the Watchtower in order to merge the files of the attack on HQ with the baseline files that the Watchtower has on the same area.
(log: 20150201-solution-is-up-in-the-air | tags: fitz hawkeye hawkeye_ii jla shield watchtower | posted: 02 Feb 2015 22:21)

Howard's 11: Express Service to New Orleans
February 1, 2015: SHIELD agents pick up Howard Stark en route to Louisiana to track down arms dealers.
(log: 20150201-howard-s-11:express-service-to-new-orleans | tags: black_widow fitz howard_stark maria_hill shield simmons | posted: 02 Feb 2015 22:28)

Esoteric Power Supply
January 30, 2015: Simmons catches up with Fitz after a long seperation
(log: 20150131-esotericpowersupply | tags: fitz shield simmons | posted: 01 Feb 2015 05:14)

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