Irina Shidou

Irina Shidou is one of the many female protagonists of High School DxD and the childhood friend of Issei Hyoudou. She is a devout Christian who, even after learning of God's death, still follows His teachings. She later gets reincarnated as an Angel by the Archangel Michael through one of the Brave Saints, her ranking among his peerage being "Ace".