Bad Sprite Choice
Call me what you want, but it's the truth. I'll tell you the problems:
Mario: I have not TOO big of a problem with Mario, but you should have used something more modern, like Mario And Luigi SS sprites.
Link: They would have been good if they wouldn't have been all... how to explain... The colors were all scattered... It was terrible...
Cloud: My LEAST favorite: I HATE the KH version of Cloud! What is with that stupid wing?! Even if you couldn't fing good FF7 version Cloud sprites, make them yourself because the KH ones are TERRIBLE.
Riku: Meh. I got no problem with him, Sonic, or Knuckles.
Bowser: Too big. You should have used M&L ones like the Mario ones.
Eggman: No problem.
TAKE MY ADVICE.