Luigi The President
Smash Hero
ANOTHER JACK FROST SUPPORTER?!If we were to get another rep for the third-parties, I'd just want my favorites haha:
Sonic: Blaze the Cat (teh phire, awesome design)
Bayonnaise: N/A (zilch, Bayo's fine)
SEGA in general: Jack Frost (ATLAS rep, Nintendo-like cutest design) or Billy Hatcher (Yoshi clone for days haha [not really])
Mega Man: Roll (C'mon, Rock and Roll!)
Ryu: Chun-li (is there really any other choice?)
Capcom in general: Felyne (the best Monster Hunter rep)
Cloud: Black Mage (SSF2 shows how good a moveset for him can be)
Squeenix in general: Geno (duh)
Pac-Man/Namco in general: Yoshimitsu (mainstay of Namco's two biggest fighting game franchises)
Ubisoft: Rayman and Ezio Auditore (obvious), Barbara and Fiora Carvazza/Courtesan (second reps; Barbara is a Viking lady - awesome - and Fiora is the Brotherhood MP character who is on all the promotional material, is super popular, and has a lot of canon backstory and relative importance to the series compared to some other characters, as well as fights with a bladed fan - super awesome)
Koei Tecmo: Ryu Hayabusa and Lu Bu (obvious), Kasumi and Li Dian (Kasumi is also obvious, but c'mon, don't play Dynasty Warriors and then tell me that Li Dian's weapon isn't awesome-amazing)
Other third-parties: Layton, Jibanyan, Maxwell, Cooking Mama (The most Nintendo non-Nintendo characters out there, most people not familiar with them probably wouldn't even second-guess that they weren't Nintendo characters; perfect fit)
"4th-parties"/Disney: Mickey Mouse (Single most well-known Western mascot, pretty much bar none), Aqua (Sora is overrated, Aqua is where it's at. She's awesome and she can do everything Sora can and more. )
That's basically it haha.
ATLUS*. I wouldn't consider Jack a Sega rep.