Possibly another ally in the Great Sun Destruction Plan. I don't think I've previously seen a vampire design where the tips of the hair are made to look like bat wings. I wonder if she is the "burn to a pile of ash and revive with a drop of blood" sort of vampire, so we can have even more black humor. Also, in addition to armpits the author seems to be partial to monster girls with sharp teeth. We got some earlier emphasis on Mizore's impressive (for a snow woman?) dentition, and now we have a vampire.