×Riddle Rosehearts×

Riddle has medium-length, maroon-red hair that curves inwards, V-shaped bangs that cover his forehead, plus a side fringe and two strands of hair that form a heart on top of his head. He has a stern look and silver eyes. He wears a small crown resting on the left side of his head. His outfit consists of a white and red coat with the ends lined in gold fabric. The inside of the coat is completely red with a pattern consisting of small hearts, spades, diamonds, clovers, and crowns. He also wears white pants.

Riddle has a strong commitment and dedication to implementing the rules of the Queen of Hearts and asks all residents of the Heartslabyul dorm to obey all available rules. He has no problem with "cutting off the heads of those who break the rules" (Riddle's unique magic is "Cut off their heads", this magic blocks his rival by placing a collar around their neck). He is quite irritable and gets angry if someone admits to being against the rules he has set. After the events of Episode 1, he becomes more lenient regarding rule enforcement, but is still considerably strict.