Batman always prevails in the end.
The Joker would win, one he is friends with Batman, two he is awesome. Two he would start of with a beat from Batman, and start with the saying "Do you want to know how I got these scars?"
Mario dies when a turtle touches him. Batman can fight the Joker, and still walk away fine. Batman would win.
Joker. Mother Gothel is stronger but Joker is smarter. Joker would win. But if they do death battle, Joker will win because he can shoot Mother Gothel.
Joker
no doubt the joker
Batman would keep trying but he won't succeed in that point. Gamera can throw Batman to a harbor but Batman would grapple to a skyscraper. Batman would put Gamera to sleep so he couldn't punch him. He would make him sleep for 5 days. He would go try to go catch the Joker.
Joker
batman would.
Joker Hands down
Magneto, unless joker has prep.
Batman would beat Sonic.