He had his life taken from him as he was the host of a powerful Sacred Gear, <Gauntlet of the Red Dragon Emperor (Boosted Gear)>, but by reincarnating as a devil thanks to Rias, he becomes one of Rias' minions. Stupid and perverted, but unexpectedly passionate and hard-working.

Goes by “Issei”.

The most beautiful girl in the academy, and the upperclassman that Issei longed for the most. She actually is a high-ranking devil and the next heir to the established Gremory clan. One of the most powerful in the academy, and is also the leader of the Occult Research Club, a club where she gathered all her minions. Issei's master. Ever since her battle with Riser, she lives together with Issei at his home.

A kind-hearted, beautiful girl who possesses a Sacred Gear that heals wounds. She worked until a fallen angel that fought against devils, but ends up becoming one of Rias' minions. Has romantic aspirations for Issei, and ever since Rias started living together with him at his house, her approaches to Issei have gotten more and more daring.

Nicknamed the “Priestess of Lightning”, she is the number two minion under Gremory, and the vice-leader of the Occult Research Club. Dubbed the “two big sisters” of the academy together with Rias, and has immense popularity. Normally has a very good-natured personality and often says “oh my” and giggles. However, in battle, she is a super-sadistic dominatrix.

A beautiful girl who gathers popularity as the mascot of the academy. Doesn't show much emotion on her face, and is reticent, but lashes out fiercely against Issei. Has immense power that is unbelievable considering her very small frame. She is always eating something.

A nice young fellow who possesses Sacred Gear that can create demon swords with any property. An attractive boy with good looks, good brains, and good personality, he is very popular among the girls of the academy. Was often the target of Issei's one-sided jealousy, but as they overcome one battle after another, they start to recognize each other's strengths. Self-proclaimed friend of Issei.

A skilled beautiful swordswoman who was sent out by the Church with a certain covert mission. Contrary to her poised appearance, she is somewhat of an airhead that lacks common sense as she spent all her life growing up within the Church. Her battle type is that of power that specializes on how strong the attack is, and the attacks she lashes out with have tremendous destructive powers.

A beautiful girl that was sent out from the Church along with Xenovia. A certain talent of hers was noticed in the past, which caused her to learn swordsmanship within the Church. Acts as though she has known about Issei from way in the past. Her battle type is that of speed that uses her agility heavily to launch tricky attacks, and her sword swings are kaleidoscopic.

The other bishop of Gremory's minions that had been sealed away in the room that nobody ever opened in the old school building. A first year just like Koneko, and a half-vampire born between a human and a vampire, but hates blood and is a serious shut-in. Seems like a cute yet beautiful blonde girl at first glance, but holds a secret that would make Issei shed tears.