Kotake and Koume, Twinrova, because i thought that the way you beat them was ingenious using their sisters ability against them by storing the power in a shield and then shooting it back at them. And then Twinrova shooting her with them again and then slashing away at her... Plus at the end when they both go to "heaven" and are arguing, and other then ganondorf thay are the only bosses that actuallt talk.