User blog comment:Metadwarfosis/In anticipation of volume 11- Dwarven Kingdom and Expectations/@comment-60.50.0.119-20160801214528/@comment-29248623-20160802022319

For Renner's personality a succubus for like Albedo would also work. She would still look Angelic when calm and such and she is just like Albedo when it comes to yandere mode.But that would reduce Albedo's uniqueness as being the only succcubus we know of in Nazarick.

I think she could also be a doppelganger like, PA and Narberal or a Werewolf like Lupusregina. There's still a few options ouside of just the angel route.