Yugi Tsukasa

Yugi Tsukasa (柚木司) is the main antagonist in the series. He is a ghost haunting Kamome Academy and is the younger twin brother of Yugi Amane. He currently resides in the school's Broadcasting Club room with its members Sakura and Natsuhiko.

Appearance
Tsukasa is a short boy with choppy, dark brown hair and wide amber eyes. He looks nearly identical to his older twin brother, Hanako, appearance-wise, but his eye pupils are always constricted and he has two small fang-shaped teeth.

In his first appearance, he wore an identical gakuran uniform and hat to Hanako, purposefully matching his clothes. After this, his outfit changes to a Shosei-styled uniform. Tsukasa wears a white Western shirt with a black kimono over top, a grey hakama, black shoes, red ankle-height socks, and a hat, similar to Hanako's. Tsukasa commands 2 koku-joudai, similar to Hanako's, except they are black instead of white, and with pink and blue circle markings respectively.

On his right cheek is a black yorishiro seal, with 封 (seal) written in red. This implies Tsukasa is a yorishiro like Sumire, and is most likely Amane's yorishiro.

Human Appearance
As a human, he wears Kamome Academy's old uniform - a white short-sleeved button-up shirt with black pants.

Young Appearance
As a child, he was identical to his twin brother, Amane from head to toe. This also included the clothes they wore except for several occasions like the Tanabata festival. When they were watching a movie of Frankenstein, which was the movie that Tsukasa mentioned in Chapter 34 about an artificial human, the two were sitting side-by-side in white short-sleeved shirts and dark brown overalls.

Festival Appearance
Although Tsukasa wasn't seen in the Star Festival arc, Amane comments that he had been occupied with the katanuki stand, and there is another person standing beside Amane in the Volume 8 sleeve. His yukata contrasts Amane's darker moon-themed one, since it's a paler color and covered in pink, purple, and yellow sun and cloud patterns. The difference between their masks is that Amane wears it on the side of his head, and Tsukasa's matching mask was strung onto his back.

Personality
As a ghost, Tsukasa appears to be cheerful and quite immature. He genuinely adores his older brother, Amane, and will happily jump into his arms upon seeing him despite Amane's visible unease. Due to this childish demeanor, he is often treated like a little kid by Sakura, his assistant, whom he is bound to by contract. However, he is capable of carrying out extreme acts of violence with no remorse. This is shown when he gleefully cuts into a puffer fish just to see what they look like on the inside, despite being warned against doing so. Emotional and enigmatic, it is unclear what motivates Tsukasa to go so far in interfering with the supernaturals at school. However, he has stated that he likes "the look on people's faces when they decide to stop holding back". He has been shown to care very little about the rules and order between supernaturals and humans, and will break the rules as he desires.

Tsukasa is rather manipulative. This is most evident when Tsukasa altered Mitsuba's rumor in order to create the monstrous "Bent-Neck Boy At The School Entrance". He was shown to be very controlling; during the Hell of Mirrors Arc he refused to back down unless someone did as he ordered.

Tsukasa seems to give little weight to the topic of his own murder, often referencing it with no hesitation. As such, he uses his death as leverage against Hanako, who is still distraught at the very mention of it. He derives happiness from seeing pain on someone's face, calling Amane's face before he killed him his "favorite expression".

When he was younger, as seen in Chapter 78, Tsukasa retained virtually the same personality. He was cheerful and frequently looked for items to cheer his sick brother, Amane, up. However, he is distraught when he hears his brother has not much time to live and sacrifices himself for Amane's welfare. After his sacrifice, their mother momentarily noticed something was off before consulting with the shrine priests. Adamantly claiming that he had been possessed and begging them to bring her real son back, Nagisa went to check on the boy. But before he could receive a response, the boy immediately points a finger at him while saying his wish would come true. The day after, the head priest had ominously died, which was the person that Nagisa carried a lot of ire against.

Command of Koku-joudai
Tsukasa possesses two black koku-joudai, with red and blue circle patterns respectively. He is capable of using them to play a trick on others' eyes. In his first appearance, he turned one into a folded black paper crane. It is unclear if his ability to appear and disappear in thin air is related to the koku-joudai. It is assumed that his koku-joudai can perform similar tasks to Hanako's haku-joudai—fighting, searching, tagging people, etc.

Enhanced Fighting Ability
In the Hell of Mirrors Arc, Tsukasa was able to beat Number 3 in his own domain—where the representative of the mystery should be at its most powerful. It is unclear how he amassed such powerful abilities.

Sleep Induction
(Note: This is an unofficial name.)

It is shown that Hanako and Tsukasa share the same technique for sending someone to sleep, which they both do by pressing two fingers on their target's forehead. In the Hell of Mirrors Arc, Mitsuba and Nene witness Tsukasa mercilessly killing the former No.3 by slamming it onto the ground. Nene is afraid that Tsukasa, the seemingly stronger enemy, will hurt her. Tsukasa questions if she is alive and Nene answers with a yes and later he places two blood-stained fingers on her forehead after she tries to stop him from making Mitsuba eat the apparition (Mistery Number 3), sending her to sleep. As soon as Hanako and Kou arrive in the Boundary, they find Nene lying against the wall, unconscious.

Trivia

 * Tsukasa's favorite snack is Amane.
 * Tsukasa's latest concern is Amane.
 * What he wants for Christmas is Amane.
 * Tsukasa's preferred type is Amane.
 * Tsukasa wants to spend time with Amane.
 * Tsukasa has no comment towards how he feels about lightning.
 * Tsukasa is still passionate about doing katanuki, even as a supernatural.
 * Tsukasa seems to like painting the wall with blood or ink that comes from a bug.
 * The kanji in Tsukasa's first name translates to 'control, to rule' (司).
 * The kanji in Tsukasa's surname translates to 'citrus fruit' (柚); 'tree' (木).

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Yugi Tsukasa