I have this movie called ponyo and it's japanese anime with english voices.Someone who has a Youtube account has got to make a movie with separate parts.Here's who i think should be the cast:
Ponyo(as a fish):Namine
Ponyo(as a human):Kairi
Suigyo(minions of Fuijmoto):Heartless
BTW,it's a Disney movie made by Disney and another company called Studio Ghibli.