Minor Characters in High School DxD.
Uriel (ウリエル Urieru) also known as Flame of God, is one of the Four Great Seraphs in the Sixth Heaven. He made his first appearance in the short story "Armageddon at Sports Day!", in the game of baton he fought against Sirzechs and Baraqiel while being covered by his holy flames. At some point, he and Raphael once tried to select Vasco Strada into their brave saints but he refused them. He reappeared in Volume 21, in the attack of 666, where he lost an eye and an arm during his fight. He, along with Michael and Raphael, and their Brave Saints sealed themselves to fight Trihexa, leaving his own "Ace" Nero Raimondi behind.
Raphael (ラファエル Rafaeru) is one of the Four Great Seraphs in the Sixth Heaven. Like Uriel, he once offered Vasco Strada into his Brave Saints but was refused by him. He made his first appearance in Volume 21, where he lost one of his legs during his fight against 666. He, along with Michael, Uriel, and their Brave Saints sealed themselves to fight Trihexa, leaving his own "Ace" Deethelm Waldseemüller behind.
Metatron (メタトロン Metatoron) is one of the Ten Seraphs in Heaven. He made his first appearance in the short story "Nekomata☆Ninja-Scroll", where he is fascinated by Ninjas after watching films, television, and reading manga about them. He was train by a ninja master after the Three Factions made peace and got the approval from Michael. His only known member of his Brave Saints is his "Jack" Kiyotora Shinra who is from the Shinra Clan.