Suggested by Jimmy Uncle Fester has some fairly powerful abilities. He can generate electricity and even manipulate metal objects to an extent. He’s certainly not your average human, but then again..neither is the Joker. Joker has been dealing with supernatural threats for a long time and he certainly won’t be intimidated by this Uncle. Joker’s array of gadgets and hand to hand expertise will enable him to still take the win rather easily. There hasn’t been the villain yet who could stand against his explosives and gun skills. Joker wins.