Lillianna (her name's actually Lilly, like the flower, which was given to her by her adoptive mother, but Lillianna doesn't like it cause it sounds too cutesy, and she's a Femme Fatal, dammit!) anyway...
Found with her twin brother on the doorstep, abandoned by their Green Hag mother, Lillianna was blessed with half of the mark of her great overlord and master Baalzebul on her forehead (a haloed gem). When she was dropped as an infant it cracked her skull, thus completing the holy symbol of the gem above a "split crown" in a manner of speaking...
But it was good enough! She merely needs to press her palm to her forehead and incant the holy words and call up divine (infernal) wrath! (Up as opposed to down, cause it's from hell)
It is these talents and her implacable beauty that drew the eye of her beloved master Dagor Morthis. Although he cannot freely admit his undying and eternal devotion to her (it would be bad for moral) she certainly has him enraptured utterly... even as he does little to show particular favoritism toward her, as he is a fair master that cares for his minions, she does have some leeway.
But theirs is a very understanding relationship. While their hearts belong only to each other truly, their Infernal Machinations require infidelity, but only for the cause, so she uses her seductive prowess to further his ends, it is always out of love for him, and only that... yup, all for Dagor...ahem...
Much to her chagrin, her twin brother too posses the favor of her Beloved Dagor, her Infernal Master Baalzebul, and talents equal to hers. Well, he used to at least. But mysteriously he seems to have recently vanished, (entirely coincidentally mind you) right around the time she constructed a new minion for herself. It's much better than her first Zombie, a shambling mess, stunk to Lowest Hells. This one seems to drip all the time but at least it's faster and more useful... and totally not the skeleton of her brother, definitely not.
Lillianna is a Face-woman, and plays the part of the chick that's totally in love with the BIg-Bad, and he really doesn't get it/care. I'm thinking Dagor actually does take a liking to her, as a useful minion, which she misenterprates as love. Or he just doesn't really know what to do with the Crazy Chick that's totally into him, and is a little uncomfortable with the whole thing, but puts up with it. It's mostly a comic thing, as she's The Chick in out quirky Squad.