Overwatch Theory: Doomfist is still the new/next character in the lineup. It’s a massive, hulking suit (perhaps a cross between D.Va’s mech and Reinhardt’s armor?) that doesn’t let you see who is inside the suit. Terry Crews voices the suit, and Doomfist scares the living shit out of people. It sounds brawny, manly, and like a force to be reckoned with. If you’re in a fight with Doomfist, you better believe your ass is getting kicked.
However, Doomfist seems to be fighting for the good guys? Every tussle Doomfist gets into, it’s for the greater good. Overwatch, Talon, and everyone else in the OW universe is puzzled by what is going on, especially since Doomfist used to be a bad guy.
Somehow, someone (probably from Overwatch) catches the suit open and it’s revealed that little Efi is inside, trying to fight crime using her intelligence and the suit she built with all of her grant money. (Only bad thing she did was steal Doomfist’s gauntlet, but her suit wouldn’t be complete without it so a girl’s gotta do what a girl’s gotta do.)