I don't remember this character's name, but I drew her for a friend of mine for a campaign that was specifically made for all sorts of strange combinations of creatures. :D
Here's the background I suggested for her:
The priestess of a failing clan seduces a fiend in order to create a biological weapon that would aid her people in fighting off their enemy clan and reclaiming the part of the Underdark that was once their own. Instead, her people are horrified by her actions and banish her and her newborn half-fiend daughter.
I'm not sure if she did take that background (she's somewhat headstrong and I guess didn't think much about how Drows get along with other species - lol, they don't. XD Anyways...) This would be the daughter, in her late teenage years? I had some trouble with the torso, you can tell. >,< Mediums: ink and colored pencils.