 Onyx (voiced by Kevin Michael Richardson) is a man whose exposure to the Big Bang transformed him into a giant purple-colored 'boy of stone', granting him superhuman strength and durability, but which also makes him physically slow, heavy and ungraceful.He essentially serves as Puff's strong man, who is able to crush and smash things in his way with very little effort.Onyx is usually more mellow than Puff and early on tries to be the voice of reason, but would always do what she tells him to in order to get the job done.