Age: 17

Birthday: August 24

Height: 160cm
Class: 2-E / no. 26

Riddle Rosehearts (リドル・ローズハート, Ridoru Rōzuhāto) is a second-year and the head of Heartslabyul. He strictly upholds all 810 strange rules made by the "Queen of Hearts." He's feared by the rest of the students because of his severe punishments towards those who break the rules. (He "cuts off" their heads).

Age: 16

Birthday: September 23

Height: 172cm
Class: 1-A / no. 25

Ace Trappola (エース・トラッポラ, Ēsu Torappora) is a first-year student in Heartslabyul. He's clever and has a bright personality, but can be a little mean too. He's rivals with Deuce.

Age: 16

Birthday: June 3

Height: 173cm
Class: 1-A / no. 24

Deuce Spade (デュース・スペード, Dūsu Supēdo) is a first-year student in Heartslabyul. He enrolled in the school aiming to become a powerful mage. He's very serious, but a little disorganized.

Age: 18

Birthday: October 25

Height: 181cm
Class: 3-E / no. 4

Trey Clover (トレイ・クローバー, Torei Kurōbā) is a third-year and the vice head of Heartslabyul. He's calm and is seen as a protector by the rest. He always backs up the overly-strict Riddle. Though unlike Riddle who is overly obsessed into memorizing and following every single rule made by the Queen of Hearts, Trey only memorized 350 of them.

Age: 18

Birthday: February 4

Height: 176cm
Class: 3-B / no. 5

Cater Diamond (ケイト・ダイヤモンド, Keito Daiyamondo) is a third-year student in Heartslabyul. He's very perceptive with great communication skills as well as popular, stylish, and a gourmet. However, he can sometimes be cruel.