Komaou Private Academy High School, Sophomore. Rank: Pawn.

He's a pervert, has a habit of fantasizing, and is well known for being creepy at the academy, but he's also surprisingly hot-blooded and hard-working. His first girlfriend suddenly kills him, but Rias saves him and brings him back to life as a devil of her own clan, making him a member of the Occult Research Club.

His rank is "Pawn" and his powers as a devil rank at the bottom so far, but on his left arm he wields the Sacred Gear, Crimson Dragon Emperor's Gauntlet. This stupid, perverted protagonist works hard day and night for the sake of his master and the highest ranking devil, Rias. "I am your Pawn!"

Komaou Private Academy High School, Senior. Rank: King.

A madonna of the academy, Issei's master, and a woman people admire. Her true identity is the Crimson-Haired Ruin Princess, the heir to one of the highest ranking and famous devil families, the Gremory.

She's enrolled as an exchange student, but the truth is that she holds the power in the academy, and acts as the president of the occult research club, which is made up of the devils under her command. Her rank is "King". She's an invincible heroine who saw the power sleeping in Issei and took interest in him. "Good boy, Issei. I'll make you into a man."

Komaou Private Academy High School, Senior. Rank: Queen.

Akeno is the #2 Queen of the Gremory clan, known as the "Priestess of Thunder". She's vice president of the occult research club, and her rank is Queen. She's a beautiful girl who ranks second in popularity after Rias. Normally she's very gentle, and often says "oh my" or "Ufufu". There are a lot of mysteries to her, and Issei is right to instinctually fear her, because once she enters battle she becomes a super-class sadist. "It's alright if I give you some arousing attention now and then, isn't it?"

Komaou Private Academy High School, Sophomore. Rank: Bishop.

Asia is a beautiful Sister who Issei met while in town. She is a girl with a gentle heart who posses a divine object in her body that is capable of healing wounds.

Once, she was one of the fallen angels who oppose the devils, but for certain reasons she becomes a devil under Rias's control and transfers to Issei's class. Her rank in the occult club is Bishop. When Issei saved her she fell in love with him and decided to live together with him! "Issei-san, I love you. I'll always be at your side."

Komaou Private Academy High School, Freshman. Rank: Rook.

No matter how you look at her, she appears to be an elementary school loli devil. She's reticent and is always eating something sweet in the corner of the room. Despite her appearance, her powers as a devil are far greater than Issei's, and she posses super strength.

Her rank in the occult research club is Rook. She's a loli who's often quiet, but has a wicked tongue towards Issei. "My body and breasts may be small, but... I can still have s-sex..."

Komaou Private Academy High School, Sophomore. Rank: Knight.

Yuto is a gentle swordsman, and his rank in the occult research club is Knight. He calls himself Issei's friend, but he has good looks, a very good brain, and a pretty nice personality, so he's the object of admiration for all the female students, which causes Issei to see him as an enemy (for no reason). It makes one feel sorry for this academy's top handsome prince.