My favourite animation studio is Aardman, but to be completely honest an Aardman platform fighter wouldn't really work IMO, their films are known for being quaint, they tend to have really small casts, and their action setpieces usually rely more on the environment than characters' physical skills with villains usually playing themselves instead of being outdone by the protags - that being said, I am all for an Aardman guest character in Multiversus, NASB, or a DreamWorks platform fighter.
But this is actually really cool! Exclusively considering character's physical designs, I'd honestly have to say I'd be most willing to try and main the Dragon...