Riddle Rosehearts

Riddle Rosehearts is a second-year and the dorm head of Heartslabyul. He strictly upholds strange rules made by the Queen of Hearts. He's feared by the rest of the students because of his severe punishments toward those who break the rules.

Appearance
Riddle has red, mid-length hair that curves inward, V-shaped bangs covering his forehead, side bangs, and two strands of hair forming a heart on top of his head. He has a stern look and silver eyes.

He wears a small crown leaning on the left side of his head. His outfit consists of a white and red coat dress with the bottom being lined with a gold-colored fabric. The inside of the coat dress is entirely red and has a pattern consisting of tiny hearts, spades, diamonds, clovers, and crowns. He also wears white trousers.

Personality
Riddle Rosehearts is a hard-working individual and one who is fully determined to be at the top of his field, competent inside and outside of his school activities. He is known to help his peers in need, whether it be underclassmen, upperclassmen, or fellow students from the same grade. As studies are his forte, he will aid those who struggle academically, as seen with his interactions with fellow student and dorm leader Kalim, and his underclassman, Deuce. He is also capable of seeing potential in a person, as he views Epel as someone who can grow and reach to the fullest of his abilities and thus supports him in his growth. Riddle is also intelligent and more than capable in the fields and studies he pursued, often being the top of his peers and maintaining such position. As such, he is able to master studies that are supposedly above his grades, as he helped Cater, an upperclassman, in his studies.

Riddle sees the Queen of Hearts as a role model and holds dear the principles she has cemented. Just like the Queen of Hearts, Riddle is a very strict and stern dorm leader demanding those around him, whether inside or outside of the dorm he orders to bid by the rules. He has memorized all 810 rules of the Queen of Hearts and will exact punishment on his dorm members if they are caught breaking a single one. Like the Queen herself, Riddle has a short temper and has a knack of throwing tantrums. His tantrums are often seen when one points out his height, which is one of the shortest among the students. Riddle is known to be insecure about his height, and dislikes it when it is pointed out.

Skills and Magic
Fire Magic: Riddle seems to be very adept at fire magic as seen in his Ghost Bride story, the beginning of the official manga, and other various times. In the manga, Riddle's fire magic is strong enough to completely destroy a Phantom Miner.

Unique Magic
Riddle's unique magic is called "Off with Your Head!" (, Ofu Wizu Yua Heddo!; lit. "Decapitate the head!"). It causes a collar to lock around one's neck, sealing away their magic until he takes it off. . In the Episode of Heartslabyul manga, his unique magic can also be used on non-magic users even though it's not necessary. {{Spoiler section| While the collar cannot be removed by the victims themselves once it locks, it can be countered with defensive magic before the locking occurs.

Weaknesses
Only two instances have been shown: with Trey Clover in the climax of Episode 1, and with Leona Kingscholar in the climax of Episode 2 - The Rebel of the Savanna. Leona deflected Off with Your Head! using defensive magic while Trey overwrote Riddle's magic with his own Doodle Suit. In the manga, the collar doesn't seem to have any effects on Yuuken's visions.

Former Abilities
Blot manipulation: In the manga, Riddle can manipulate the essence of blot in his Overblot form. He first demonstrates it by constructing card motif spears at Ace and the others. }}

Trivia

 * Riddle's name is an allusion to Alice in Wonderland's protagonist, Alice Liddell, as "Liddell" and "riddle" are phonetically similar in Japanese. The last name Rosehearts comes from the words "rose" as a reference to the Queen's favorite flowers; and "hearts" as a more overt reference to the Queen of Hearts.
 * His first name may also be a general nod to some of Alice in Wonderland's characters, who frequently speak in riddles.
 * His horse in the Equestrian Club is named Vorpal.
 * This is most likely a reference to the vorpal sword, a weapon first mentioned in Lewis Carroll's short poem "Jabberwocky". The sword later appears in Tim Burton's live-action adaptation of Alice in Wonderland in 2010.