DONALD DUCK vs DAFFY DUCK!!!!!!1!!!1
Things like that wouldn't work because Donald Duck and Daffy Duck don't have any powers or abilities that allow them to fight, considering they aren't from fighting shows. They'd have to just peck each other with their beaks :/ and you couldn't make moves up because that could get ridiculous, e.g. "Donald Duck got a machine gun and started firing at Daffy Duck".
"Daffy Duck used his special powers to bring about the apocalypse!"
So I don't really understand, who would decide who wins?