Hellboy is a billion times better than that. PArt vampire, part demon? What the fuck?
You think that beats the KEY TO THE APOCALYPSE FOR A RIGHT HAND!?
You have no taste.
EDIT: As for biggest badass in hell? Wel there's the Demon Etrigan, Sandman visited hell once, as did Lobo who actually kinda ripped the place apart. Then there's Astaroth who's keeping Hellboy's crown for him.