Mikaela Hyakuya

Mikaela (Mika) Hyakuya is from the anime and manga series Owari no Seraph or Seraph of the End. A seraph in a past life, he was a human that got turned into a vampire unwillingly, yearning to save Yuuichirou from the clutches of war. Now a demon in Yuu's sword, he aims to turn themselves back into humans.