Callie Maggotbone is Mark's immediate superior, and also his on-again/off-again girlfriend. In between stealing Mark away for bathroom rendezvous, Callie is berating him for being so soft. She's the typical 20-something girl who doesn't know what she wants, but is also bona fide hellspawn, as her father is a high-ranking minion of the Devil. However, since Callie is the product of that demon's union with her waifish human mother (who was drugged by a cult), Callie is frequently conflicted by her human side. She is drawn to Mark the nice guy, but feels in her heart that she will inevitably end up with someone like Twayne the Bone Raper...after all, it's what daddy wants. Unfortunately for all of us, such a union could potentially lead to the apocalypse.