Lucadra

"Hey! I'm borrowing some space in your head for a while. I originally wanted your body, but that didn't go well sooo...Heya, roomy!"

- Lucadra upon entering Amon's subconscious "Oh, look at you. Crawling on the floor and bleeding out again. Oh, how pitiful. I can't believe I'll be using such a weakling's body one day. Go on. Stand up now. Entertain this maiden inside your head more."

- Lucadra belittling an injured Amon Lucadra (ルケーイドラ, Rukēidora) is a Vampire of presumably great power, as well as an incredibly advanced age. She has been called Apostle of the Damned (開祖の罰当たり, Kaiso no Bachiatari), being believed to be one of the first vampires to appear on Earth Land.

After being hunted and severely injured by silver, Lucadra resorted to trying to fleeing and gaining a new body before her current one withered. She was found by Amon, and subsequently bit him in an attempt of controlling his body, but failed after Gram intervened, forcing her to remain stuck in Amon's consciousness along with Gram until she can gain control, and a new body.

Trivia

 * Lucadra's appearance is based off of Oshino Shinobu from the Monogatari series.
 * Lucadra is another anagram for Dracula.