Apollyon is a demanding and needy creature. He's very vain. God forbid a hair be out of place or his skull be dirty. He can be really whiny about these sort of things but can be silenced rather easily. He craves attention, good or bad, and thus can be easily forced under other's power to get it. He loves to run. Like Freaking. Loves. It. Especialy inside where he doesn't get dirty. Indoor race tracks are his favorite.

He's about as fast as a well-trained racing greyhound without using any mystical powers.
Using powers, he can hit 90- 100 miles an hour in sprinting bursts.
He is a chronic cheater(at racing, games, etc. he plays dirty) and liar.