artina (disgaea)
Makai Senki Disgaea 4 character. A nun that Valvatorez met 400 years ago during a war. He made a promise to her that he wouldn't drink human blood until he frightened her.
Artina was killed by soldiers on her side of the war for healing an enemy soldier, thus leaving the promise unfulfilled. She is reincarnated into the angel Vulcanus.