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" Diethelm 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 trained 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.
Caesar Villiers (シーザーヴィリエ, Shīzā Vu~irie) is a former high ranking teacher at the Protestant Church and the former boss of Irina. He eventually reincarnated into a Angel as Uriel’s Jack. He appeared in Volume 21, among those who were about to be sealed to fight Trihexa.
Ryuu Heikan (リュウ・ハイカン, Ryū Haikan) is Raziel‘s Ten. He is skilled as a Chinese martial artist who used the power of light as the core of his fighting style.
Jessica Lagerkvist (ジェシカ・ラーゲキビスト, Jeshika Rāgekibisuto) is Sandalphon‘s Queen. She is a beautiful woman with blue eyes and blonde hair, with a sleepy face. She uses her light-based weapons to create a solid barrier-type technique to block attacks.