If I were to pick though I'd have:
Zeus (God of War)
Kessler with his own move set (Infamous)
Hmm...for Capcom I'd personally like Amaterasu from Okami, such a fantastic game that came out near the end of the PS2's life span (the HD remake on PSN store really made me happy to see people have another chance to play this gem).
She'd certainly have an interesting move set using the Celestial Brush and her intro and ending scenes for her arcade mode could easily reflect upon the artwork for Okami with a similar storytelling narration that happened at the begining of her game.