Kiyotaka Ayanokōji is the main protagonist of the You-Zitsu series. He is currently a second-year student of Advanced Nurturing High School. Following the entrance exam in which he scored precisely 50 points in every subject, he was placed in D-Class. In the anime adaptation, he sits at the rear left corner of the class seat next to Suzune Horikita. Kiyotaka is a tall and lean young man with brown hair, brown eyes, and a fair complexion. He is usually seen wearing a standard school uniform. Outside of school, he wears a white hoodie covering a green shirt with an orange stripe along with brown pants. He is also seen wearing a blue vest over a white shirt and brown pants. He has grown taller since his first arrival at the school. He is considered to be very handsome, as was mentioned in the light novels, by Kikyō Kushida, that he ranked 5th in ikemen amongst the first-year boys. This is somewhat confirmed as he has attracted the attention of many girls in his class, some of whom are even very popular. Kei, before she officially started dating him, said he is considered to be in the top 10 of the hottest boys in the entire school. Satō finds him hotter than even Yōsuke Hirata despite being rejected by Kiyotaka. He also has an incredibly well-built body, which was pointed out by Suzune Horikita at the swimming pool. She noticed the immense muscular structure of his body and his arms, particularly his lower arms, and questioned if he did sports, to which he adamantly denied. The reason for this is most likely due to the extensive training he went through as a child in the White Room. Most of the time, he is shown to express a lackadaisical and idle look, which gives off an unconcerned attitude. This can be interpreted as indifference or a relatively passive demeanor to his peers. It is shown in a flashback, that even as a child he possessed a similar unmoving expression that he would keep until adolescence. Many see him as someone who is devoid of emotions as he has never once cried or smiled in their presence calling him abnormal. But however the light novel depicts (to an extent) Kiyotaka with more dynamic facial expressions. Kiyotaka is an inconspicuous and unobtrusive student, and while his grades are average (on purpose), he possesses a sagacious ability to read the emotions of people around him with pinpoint accuracy and either helps or destroys them. Despite his apparent laziness and lack of interest in everything and everyone, Kiyotaka is actually a highly intelligent individual, often pulling the strings behind the scenes.

Due to the upbringing in the White Room, he has come to see everyone around him as a tool and is only intent on winning above everything else. He does not mind manipulating others nor concerning himself with sacrificing a pawn as long as they help obtain his goal. Because of this mindset and his actions, it is unknown whether he really cares for those he has befriended or if he just gained their trust to use them. It has been shown that he didn't have any emotions to begin with, as he had an untouched heartbeat during a fight with multiple fighters or while receiving praise by his father. His tendency to feed his intellectual curiosity, leads to apathy towards the feelings of other people, as he believes it is irrelevant to his learning and his self.

In the light novels, his personality is somewhat different as he displays more emotion even having comedic fashions though he appears to still carry on a serious mindset. He has an extreme sense of unflappability and is sangfroid during difficult times. He has never shown to be under any distress when faced with threat or danger but once, he was blatantly angry at Kakeru after his deplorable acts against Kei. He is the most astute student in his class, crafting plans even Horikita wouldn’t be able to. Despite his abilities being leagues above others, he has no hubris but is lackadaisical about them.

Almost everything about Kiyotaka's life before the entrance exams is unknown. However, during a flashback, he was shown to be part of a group of kids involved with an unknown organization called the White Room, headed by his father. He appeared to have maintained his stoic expression even as a child, as he showed no emotion and looked on when another child, situated at his left, had difficulty breathing and probably fainted for reasons unknown. There was also a time when his father had approached and told him that "those who don't reveal their talents are fools." From his time there, Kiyotaka underwent various training regiments, presumably including martial arts, while taking heavy and challenging written examinations giving him both extreme physical abilities and mental prowess. As time went on, more children started suffering like the fainted child, Kiyotaka eventually became the lone survivor of the group. His training led him to believe that all humans are nothing, but tools and that victory is all that matters in the world. With this point of view, he became determined to win no matter what and sacrifice anything or anyone to achieve his goal of obtaining victory. His father was pleased with his success, believing that his son would be the greatest in the world. At some point, the White Room was temporarily shut down for one year and this gave Kiyotaka a chance to escape with the help of Matsuo (Kiyotaka's butler) who told him to enroll at the Advanced Nurturing High School where his father cannot reach, and he would be able to live a normal school life. Kiyotaka took the entrance exams to enter Advanced Nurturing High School and scored exactly 50 out of 100 points on every subject. A few others heavily hinted that this act was done on purpose to avoid unwanted attention from the school, which he denied by claiming it to be merely a coincidence. In the manga, he stated (in his monologue) that the biggest reason why he chose Advanced Nurturing High School was that he wanted freedom. He also noted in his monologue that while in middle school, he was forbidden to associate with friends, or even relatives, that were not approved for him.

In this roleplay we are arrived at the final day of the first year ended not with celebration, but with a threat.

Kiyotaka Ayanokōji stood in the corridor after the graduation ceremony for the third-years, his dead-fish eyes fixed on the man who had appeared before him—Tsukishiro, the newly appointed Acting Director of the Tokyo Metropolitan Advanced Nurturing High School. The man was tall, impeccably dressed, with sharp features and a calm smile that never reached his cold, calculating eyes.

"Ayanokōji Kiyotaka," Tsukishiro said, his voice smooth as silk. "I've been looking forward to meeting you. Your father sends his regards."

Kiyotaka said nothing. He didn't need to. The message was clear.

"Next year," Tsukishiro continued, "some very interesting first-year students will be enrolling. I do hope you'll get along with them. They've been... specially trained, you might say. Their sole purpose? To ensure your expulsion from this school. And if they succeed, you'll be returning to the White Room."

The White Room. The facility where Kiyotaka had been forged into a weapon. The place he had escaped.

"Of course," Tsukishiro added pleasantly, "I have no personal stake in this. I'm simply following orders. But I must warn you—these students are not like the ones you've faced before. They are products of the White Room's later generations. They are, in many ways, your legacy."

He turned to leave, then paused. "Oh, and Ayanokōji? Don't bother trying to identify them. They won't be wearing signs. They'll be your kouhai, your juniors. And one of them will be your downfall."

Tsukishiro disappeared into the elevator, leaving Kiyotaka alone with the weight of the coming storm.

The White Room is sending hunters, Kiyotaka thought. And I am the prey.

There could be include a lot characters: Ichika Amasawa wich is A first-year student in Class 1-A who appears cheerful, cunning, and mischievous. She is a product of the same fifth generation of the White Room as Takuya Yagami . Unlike previous generations, she and Yagami were given socialization training, allowing her to blend in easily. She was born through in-vitro fertilization and possesses innate talents that ironically contradict the White Room's purpose .Amasawa was sent by the Acting Director Tsukishiro to help expel Kiyotaka Ayanokōji. She initially supports Kazuomi Hōsen's violent schemes, even refining his plan to use a knife to get Ayanokōji in trouble. She openly reveals her identity to Ayanokōji during the Uninhabited Island Exam. After her classmate Yagami is expelled, she effectively gives up on her mission, choosing to enjoy her remaining high school life. She has straight magenta hair that she ties into twin-tails with red ribbons, and she has golden yellow gradient eyes. As noted by Kikyō Kushida, Ichika's colorful eyes are like hollow, empty voids that have lost touch with reality. She is so far seen wearing formal school attire consisting of an orange blouse paired with an unbuttoned crimson blazer, a blue ribbon, a short, white, sailor-striped pleated skirt, and black thigh-highs. Ichika possesses a high level of seductiveness and appeal that can effortlessly charm the likes of Ken Sudō, making him believe her words based on how she carries herself. Ichika has a very mischievous and boisterous personality, devilishly teasing every person she has an interest in with her shenanigans,[1] even when it annoys them. Because of that, Kikyō Kushida described her as having a rotten, smug, and condescending attitude. Ichika is extremely playful with her words, not taking what she says seriously and treating it as fun and games by evading questions or telling bald-faced lies. Ichika has a whimsical way of doing things, choosing to act on her impish impulses but sometimes following through with her plans if they interest her after careful deliberation. In many ways, Ichika has shown herself to be fickle, quickly changing her mind at any given moment, even in the midst of negotiations. She is perceptive and understands what others may think of her based on her actions. In many situations, she has pointed out what others wanted to say before they could get a word out, shooting down their arguments and excuses and leaving them speechless. Ichika can come off as quite provocative with her shrewd remarks, making others feel uncomfortable with how she acts without caring how they judge her. She knows how to make others vulnerable and plays to her strength by lambasting her opponents to negatively alter their state of mind, forcing them to make detrimental mistakes. On the other hand, she also knows how to appeal to the strengths and weaknesses of others, making them think positively, which in turn causes them to trust her and do what she wants without delay. However, when she gets serious, the only word that can describe her is terrifying, as she won’t stop until she gets her desired outcome and is capable of displaying a malicious aura. In some regards, Ichika can be seen as tolerant of what people say to her, such as when Kiyotaka calls her a demon for recklessly spending her private points, although this privilege may only be given to people she likes. Ichika possesses an abundance of self-esteem and values herself highly, proactively inserting herself into situations to conspire and manipulate others. When making deals, she demands more in return and ensures she reaps personal benefits from the outcome. Ichika has a habit of speaking casually with a relaxed tone in all situations. Despite having amazing communication skills, Ichika admits that she has no intention of doing so. Nonetheless, Ichika is thoughtful and reminisces about her life in the White Room and the peers she got to know there, which matters more to her than her idol, Kiyotaka, due to the difference in time spent and lack of familiarity. She dislikes seeing outsiders like Kikyō Kushida (who was attempting to expel Kiyotaka) get in the way of her protecting Kiyotaka, as she believes people like them have no right to interfere. She shows an immense amount of care for Kiyotaka, takes steps to protect him at any cost, and has been able to hide her secret affection for him from everyone, including the White Room instructors who monitored her during all of her life. She is perspicacious and sagacious when planning ahead and is on a similar or higher tier than Kiyotaka in this regard. Moreover, she is perfectly capable of being aplomb and sangfroid, maintaining a high sense of unflappability in demanding situations, and is astute enough to turn them to her advantage at a moment’s notice. She is not above resorting to physical violence, even against someone who is disabled, if they force her to. She is also cautious enough not to overstep her boundaries, recognizing her physical injuries as an impediment and deciding to sit out and recover before taking her next action. Kazuomi Hosen: he's a volatile and violent first-year student from Class 1-D. He is selfish, caring only for his own gain and enjoyment, and has no issue making enemies . He respects only those he deems physically strong. He has an academic rating of B+ on the OAA, but his arrogance and short temper are his main weaknesses .Hōsen is one of the main antagonists in the second-year arc, tasked by Tsukishiro to expel Ayanokōji . He attempts to use brute force and intimidation, getting into a physical confrontation with Ken Sudō, who would have been in serious danger if not for his athleticism . He devises a plan to stab himself with a knife and blame Ayanokōji, but the plan is refined by Ichika Amasawa. Ayanokōji ultimately outsmarts him, even injuring himself to create a political stalemate that forces Hōsen to cooperate. Kazuomi is a very tall and muscular teenager that looks like a middle-aged man. He has short and spiky strawberry blond hair ending with navy blue roots in the fades and blue eyes. He wears the male school uniform with a black shirt without a tie inside the school blazer.

Tsubasa Nanas: a polite and calm first-year girl from Class 1-D with long blonde hair. She initially appears to be a quiet supporter of Hōsen but harbors a deep, personal vendetta against Ayanokōji . She believes he is an "evil and filthy person" for reasons she initially keeps hidden . Nanase's primary motivation is revenge. Her closest friend, Eiichirō Matsuo, was the son of the butler who helped Ayanokōji escape the White Room. In retaliation, Ayanokōji's father destroyed Matsuo's life, leading to his . Tsukishiro used this, promising Nanase a meeting with Ayanokōji's father to get an apology if she helped expel him . During the second Uninhabited Island Exam, she confronts Ayanokōji alone, but is utterly defeated . After he explains that his freedom was Matsuo's own wish and that his father would never apologize, she realizes her quest for vengeance was misguided and pledges to help him instead.

Tsubasa has hip-length light-blonde hair that is tied in the back by a white bow with bangs hanging over her forehead, blue eyes and a pretty well-endowed figure. She is seen so far wearing formal school attire consisting of a white blouse paired with a buttoned crimson blazer and blue ribbon, and a short-length white sailor striped pleated skirt.

Takuya Yagami: a friendly and sociable first-year in Class 1-B who claims to have gone to the same middle school as Kikyō Kushida and Suzune Horikita . In reality, he is the top graduate of the fifth generation of the White Room, surpassing even the innately talented Ichika Amasawa. However, he is consumed by jealousy and hatred because he is constantly compared to the program's "greatest masterpiece," Kiyotaka Ayanokōji . Yagami is the primary antagonist of the second-year arc's first semester. He is obsessed with proving he can surpass Ayanokōji and was sent to the school to expel him . He masterfully manipulates those around him, using compliments and feigned friendship to gain trust. He even orchestrated the expulsion of his own classmate, Riku Utomiya, to create chaos . Ultimately, his schemes are seen through by Ayanokōji and Kōenji. With the help of Kyō Ishigami, Ayanokōji exposes Yagami, leading to his own expulsion from the school. Takuya has brown hair and green eyes, along with a usual gentle appearance. He is commonly shown wearing the standard male school uniform.