WHOO! SOMEONE ELSE WHO CARES!
DOA 2H, 4, D: Leon, Ein
DOA5: Mila (actually the first time I fully mained a female character in any fighting game)
DOA5U: Leon, Ein, Mila (it's gonna happen dammit)
Soul Blade and all Soul Calibur games: Mitsurugi (I miss Relic soooo much)
Dissidia Final Fantasy and Dissidia Duodecim Final Fantasy: Cecil Harvey
MK (none in particular): Subzero
MK9: Smoke
Virtua Fighter 5 FS: Jacky Bryant, Vanessa Lewis (got into it in the past year about two months before DOA5 released)
Injustice: Raven (favorite DC Comics character)
BlazBlue games: Ragna or Noel (depends on mood)
Guilty Gear games: Johnny (yes, I said Johnny)
Naruto games: Neji Hyuuga, Hinata Hyuuga, Minato Namikaze (has pretty much become my US3 main)
Persona 4 Arena: Chie Satonaka
Tekken games: Hwoarang (or is it whore-aang now...? Dumbass announcer) Starting to get into Asuka
PS All Stars Battle Royale: Jak & Daxter
UMvC3 (only one I've actually played): Jill Valentine, Vergil, Chris Redfield, Dante, sometimes Albert Wesker and Nemesis (kind of a Resident Evil fan. Jill is my all time favorite RE character. Plus looking forward to the console port of Revelations, the 3DS version was absolutely fantastic)
Super Smash Bros.: Link
SSB Melee: Roy
SSB Brawl: Marth, Ike
Street Fighter series: Ken (if I even played them all for more than an hour total, not into the system at all)
Any DBZ game: Vegeta, Guess Who It Is (lol)
Tales of Vs.: Dhaos (hopefully comes westward with the oncoming wave of Tales games, shame my data was lost)
Star Ocean 'Til the End of Time: Albel (if that can even be counted lol)
Edit:
Melty Blood Act Cadenza: Warakia, Red Arcueid
Fate/Unlimited Codes: Archer
Jump Ultimate Stars: Bankai Ichigo (with one hell of a build)
Bleach games: Byakuya (all forms), Bankai Ichigo
Can't recall any other off the top of my head. I know there are at least five others...