Nerull the Reaper, Myrukul, Bhaal, Set, Hades, Hel, any from mythos or from D&D IP. Heck, how about Asmodeus or just Death.
The Raven Queen concept sounds unimaginative and the name is same. I noticed lots of women characters have similar names by the 3e writers. Hag Queen, Succubus Queen, Red...