I imagine this little gremlin is what I like to call a "justified monster".
A person who's undeniably monstrous and scary who takes pleasure in their monstrosity, but in-general, only to people who deserve to be scared of them. They live for that karmic thrill, so to speak.

Those characters can be a blast to work with, in spite or perhaps even because of their moral questionability. The Karma they inflict, cathartic, and their excitement over it both unsettling and a little infectious.

Personally I'm thinking they hunt down other high-and-mighty vampires who think themselves so great, tearing them down. Perhaps they never wanted to be a vampire, but they use their newfound powers to make every other vampire regret that they were ever turned.

Those were the ideas I was playing around with anyways. Idk if I'll do anything with this or ever finish it but I thought the ideas were fun ^.^