Sonic Smash

I just wana to say that I'm creating a fan game based off of Brawl. I have all of the caracters, but, I need to know witch caracters, arenas, modes, bosses, ect., ect. to add. And also, I need to know if anyone can help. Please comment.

This is what I have so far.

Caracters: Sonic, Tails, Knuckles, Amy, Shadow, Little Shadow, Rouge, Blaze, Emral, Gemral

Edit: New name, now all about sonic and some fan characters, more soon.