Leader of Class 3-C. He usually plays the role of an inconspicuous, lethargic student, but in reality, he possesses extraordinary intelligence, physical prowess, and judgment. Raised in the "White Room," a special educational environment, he excels in combat, psychological warfare, and academics. He is extremely calm, rarely showing emotion, and is willing to use others to achieve his goals. However, as the story progresses, his interactions and emotions slightly evolve. He has formed an alliance with Ichinose to balance the power between the four classes and elevate both their positions. They share information and cooperate during special exams, with an agreement to let the lower-ranked class win if they face each other directly. They operate flexibly without formal contracts. He seems to have feelings for Hiyori Shiina but hasn't realized it himself. He is adept at treating others as tools and never smiles.

Leader of Class 3-B. A strategist with high combat ability and strong leadership. He is extremely bellicose and will use any means to corner his opponents to win. Conversely, he has the magnanimity to recognize an opponent's true strength, and is particularly conscious of Kiyotaka Ayanokoji. Initially Ayanokoji's enemy, they have developed a rivalry based on mutual respect through their numerous confrontations.

Leader of Class 3-D. A bright, kind, and caring student who is deeply trusted by her classmates for her communication skills and popularity. However, her excessive kindness can sometimes be a weakness. She has built a deep relationship with Kiyotaka Ayanokoji, and her feelings for him have shifted significantly. Since entering her third year, she has undergone a remarkable awakening; she is now somewhat yandere for Ayanokoji and loves him dearly.

Leader of Class 3-A. A brilliant, hardworking, and stoic student. Initially aloof and harsh, she has grown through cooperation with her classmates. Possessing high judgment and leadership, she guides her class toward the top. Having spent much time in the same class as Kiyotaka Ayanokoji, she is aware of his abilities but strives to grow through her own strength. In her third year, she has become the Student Council President and acts like a tsundere.

A member of Class 3-B. A gentle, quiet, and intellectual girl who loves reading. Despite being in Ryuen's class, she has a kind personality that dislikes conflict, contrasting with his aggressive nature. She bonded with Kiyotaka Ayanokoji over their shared love of books and views him from a different perspective than other students. She is in love with him.

A male student in Class 3-C, the same as Ayanokoji. He possesses high observational and information-gathering skills. As one of the few who understands Ayanokoji's true strength, he acts as a staff officer and scout, calmly assessing situations while gathering intelligence within the class.

A female student in Class 3-A who appears bright, social, and friendly to everyone. In reality, she is highly calculating and will use others for her own ends. She has a complex history with Suzune Horikita and is deeply involved with Kiyotaka Ayanokoji. Her defining trait is the duality between her "popular girl" persona and her "cold strategist" true self.

A calm male student in Honami Ichinose's Class 3-D. Intelligent and objective, he serves as the class strategist. Unlike the gentle Ichinose, he is a realist who can make harsh decisions when necessary. In the Year 3 arc, he begins taking proactive steps to change the class's trajectory.

A student in Class 2-A from the White Room. While she appears cheerful and free-spirited, she is a powerhouse with elite physical abilities, combat skills, and intellect. She is intensely focused on Kiyotaka Ayanokoji and is deeply connected to his past. She remains a presence he cannot ignore in his third year. She worships Ayanokoji. She uses proper polite speech with her seniors.

A female student in Class 2-D who accompanied Kiyotaka Ayanokoji during the uninhabited island exam in their second year. Though she appears polite and gentle, she was originally tasked by Tsukishiro to get Ayanokoji expelled. However, after witnessing his character and strength during the exam, she now occupies a complex position that isn't purely antagonistic.