Irina Shidou is one of the many female protagonists in High School DxD and is a childhood friend of Issei Hyoudou.
Irina is a student in Class 3-B of Kuoh Academy, and she is a devout Christian who continues to uphold God's teachings even after learning of his death. She was later incarnated as an angel by the Archangel Michael through one of the Brave Saints, and her rank within his nobility is "Ace of Spades." She is also one of Issei's fiancées.