Holy shitballs:
My favorites
5. Dante vs Bayonetta: The fight really ought to have gone to Bayo but I hate her in Smash so much that I don't mind. It did sorta make me want to play DMC though since Dante is such a tongue in cheek kind of character.
4. Goomba vs Koopa: It was fun.
3. Godzilla vs Gamera: A pretty big stomp but also fun.
2. Hercule vs Dan: It's so goofy!
1. Fox vs Bucky: I like it when the fights are memorable and this one is. It was also really close since Fox basically had to give up his legs to win.
Honorable Mentions
Samus vs Boba Fett Remake(mostly cause it is in honor of Monty)
Sora vs Link in OMM because it showed the flaw in Death Battle. Namely that it has to end in a death no matter what.
Now I just need a Magi character in there but that would be kinda rough.