Hades's Links
Mildly terrified of Apollo. He's always been one for peace, which is disrupted by the impending sense of doom he gets when he's told something's going to happen to him.
Hades never fights back, so he likes messing with him, saying vague things about what's about to happen to him before it happens.
For example: "Make sure to watch your head tonight!" And at 3am, a book falls off of Hades's bookshelf and on to his head.