Read more about Leo Fitz at: Wikipedia

Official Site: ABC

Leopold James Fitz is a fictional character that originated in the Marvel Cinematic Universe before appearing in Marvel Comics. The character, created by Joss Whedon, Jed Whedon and Maurissa Tancharoen, first appeared in the pilot episode of Agents of S.H.I.E.L.D. in 2013, and has continually been portrayed by Iain De Caestecker.

In the series, Fitz is one of S.H.I.E.L.D.'s top scientific minds. His scientific knowledge is vast, and as an engineer and inventor has developed many of S.H.I.E.L.D.'s staple devices and gadgets. Many of his storylines involve his relationship with his best friend, and later lover, Jemma Simmons. Over the course of the series, Fitz suffers multiple traumas, and becomes aware of a darker and more ruthless side to his character. His darker alter-ego is commonly known as The Doctor.

In season one, Leo Fitz is brought on to S.H.I.E.L.D. agent Phil Coulson's team as an engineering and weapons technology specialist. He has a close bond with fellow agent Jemma Simmons, whom he met at the S.H.I.E.L.D. academy, with both being its Science and Technology division's youngest graduates. Near the end of the season, Fitz and Simmons lock themselves inside a medical unit for safety from rogue agent Grant Ward, who ejects the unit into the ocean. While trapped, Fitz professes his feelings for Simmons before sacrificing himself to save her. They are rescued by Nick Fury, but Fitz sustains damage to his temporal lobe as a result of oxygen deprivation and is left comatose.

In season two, Fitz initially struggles with technology and speech as a result of Ward's actions, but over time becomes a full member of the team again. Near the end of the season Fitz arranges for a date with Simmons when the Kree weapon called "Monolith", which is in S.H.I.E.L.D. custody, breaks free of containment and absorbs Simmons into itself.

Leo Fitz has not been a contender in any CBUB matches.