Think first. ALL BRAWL OR MELEE CHARACTERS AND JUS ROSTER CHARACTERS HAVE ALREADY BEEN COMPLETED. Several times over, even. Most important non-third party main characters, too, such as characters like Isaac, Andy, Ganondorf, etc. And then, as well, most important third-party and mainstream anime main characters have been made as well; example, Bomberman, Ryu, Luffy, Tsuna, etc.
Try not to suggest a 'great idea' that's been suggested hundreds of times before when it was one of the first completed.