Orlouge.
Ding ding!
1.Royalty is the best. - Princess fetish
2. Gender is a meaningless thing. - Mystics are pretty omnisexual.
Other clues:
3. Age is a meaningless thing.-Mystics are immortal.
4. I'm not a vampire, but I do like coffins. -He sticks his princesses in coffins.
5. I donate blood, but not to the red cross. They wouldnt' take my blood type- Mystic blood turns Asellus into a lesbian half mystic.
Go Neph.