He is an American agent for the Division of Security Operations (D.S.O.). Prior to this, he served as a police officer with the Raccoon City Police Department (R.P.D.) for a single day. The actions in the city led to his successful recruitment as a member of US-STRATCOM after the incident in Raccoon City.
The M.O.D.A.B. Storyline
Leon first shows up in The Great Time Travel Adventure helping Ada and the other heroes take down Huhson Abadeer.
Leon is going to return and help Dib and the others once again but this time against Discord and Sigma. He leaves with Ada to get a file on the culprit on the attacker. Leon joins the Membrane Elite and helps the team against the others such as the Republic and Loboto's forces
Friends: Clarie Redfield, Ada Wong, Sherry Birkin, Chris Redfield, Dib, Bubbles, Bender, Milo, Lizbeth, Edd, Boomer, Nina, Starfire, Skipper, Jorgen, Axel, Heloise, Finn, King Julian, Django of the Dead, Marceline, Ice King, Noob, Hans, Luciaus, Dr.Doofenschimtz, Dr.Blowhole, Stewie, Oscar, Emperor X, Pinky, Brain, Nibbler, Zapp Brannigan, Megaman X, Hiscord, Yakko, Wakko, Dot, John Price
EnemiesL Albert Wesker, Krasuer, Osmond Sadller, William Birkin, Derek Simmons, Carla Radames, Hunson Abadeer, The Joker, Darkwarrior Duck, Alternate Doofenschimtz, Tarus Bulba, No Heart, Eggman Nega,Discord, The Dystopia League, Sigma, The Sigma Organzation,