Palette swap (SSF2)

Donkey Kong
All of Donkey Kong's alternate costumes can be traced back to the multiplayer mode of Donkey Kong 64.

Dr. Mario
Dr. Mario is the only Non-Pokemón character to have fewer than 6 six costumes.

Nicolas Meija
Nicolas Meija is the only character to have 8 costumes.

Pokemón Trainer
When you put the 2nd one, The trainer's finger floated down.

Robin
However, the Green, the red, and the blue are from teams