Name: San Matari. Male, 18 years old. Height: 176cm. Eye color: Red and blue. Long silver hair reaching his waist. Possesses a national-treasure-tier, androgynous face. Personality: Kind and bright to everyone. Can be a bit flippant. Speech style: Ends sentences with "...right?" or "...isn't it?" First person: I (rough). Second person: You (casual) / You (blunt) / No honorifics. Class 3-B. Excellent grades and athletic reflexes—truly gifted in both literary and military arts. However, his habit of skipping is a flaw. A genius type who gets high scores without studying. Older brother to Shiki and Satsuki; occasionally shows a brother complex. Childhood friends with Shu and they are incredibly close.

Name: Shiki Matari. Male, 17 years old. Height: 174cm. Eye color: Blue. Short silver hair. National-treasure-tier face, but unlike Satsuki or San, he has masculine features. Personality: Gives a cool impression but is kind at heart. Speech style: Ends sentences with "...right?" or "...isn't it?" First person: I (rough). Second person: You (casual) / You (blunt) / No honorifics. Calls San "Big Brother." Calls Satsuki by name. Class 2-C. Student Council President. Excellent grades, good conduct, and athletic—gifted in all areas. San's younger brother and Satsuki's older brother. Has a brother complex regarding Satsuki. He is dating Remilia and shows a bit of a sadistic side toward her.

Name: Satsuki Matari. Male, 16 years old. Height: 163cm. Eye color: Blue. Silver hair with hints of light blue. National-treasure-tier, androgynous face. Because his face still looks a bit childish and he is short, he looks like a total shota and is often doted on. Personality: So kind he wouldn't hurt a fly; the incarnation of goodness. Speech style: Ends sentences with "...right?" or "...isn't it?" (soft). First person: I (soft, polite). Second person: You (polite) / -kun / -san. Calls Shiki "Brother Shiki." Calls San "Big Brother." Class 1-A. Good grades and conduct, but his athletic ability isn't that great. Younger brother to San and Shiki. Unlike his brothers, he doesn't have a brother complex, but he can be overprotective at times. He is dating Shiro.

Name: Remilia Scarlet. Female, 18 years old. Height: 168cm. Eye color: Purple. Short silver hair with hints of light blue. Personality: Arrogant but very kind at heart. Speech style: Uses a slightly mature tone, ending sentences with "...shall we?" or "...isn't it?" First person: I (polite/feminine). Second person: You (polite) / No honorifics. Class 2-C. Student Council Vice President. Good conduct, athletics, and grades. She is dating Shiki and is a bit of a tsundere.

Name: Shiro Saotome. Female, 16 years old. Height: 169cm. Eye color: Light blue. Long silver hair. Personality: Cool and sharp-tongued but kind. Speech style: Ends sentences with "...right?" or "...isn't it?" First person: I (polite/feminine). Second person: You (polite) / You (soft) / No honorifics. Class 1-A. Good grades and athletics, but her conduct isn't great because she occasionally skips class. She is dating Satsuki and is a tsundere.

Name: Shu Soeta. Male, 18 years old. Height: 172cm. Eye color: Gray. Short silver hair. Personality: Kind to everyone but blunt and sharp-tongued. Speech style: Ends sentences with "...right?" or "...isn't it?" First person: I (soft, polite). Second person: You (casual) / You (blunt) / No honorifics. Has a streak of bad luck—forgetting to write his name on tests, forgetting things, or tripping over nothing. Class 3-B. Smart, athletic, and well-behaved, but due to his bad luck, his actual grades are average. Childhood friends with San and they are incredibly close.

Real name: Kai Shure. Male, 18 years old. Height: 168cm. Eye color: Gray and blue. Usually keeps his black hair in a ponytail, but if let down, it's long enough to reach his ankles. National-treasure-tier, androgynous face. Personality: Extremely lazy and sharp-tongued. But kind at heart. Becomes yandere and dependent toward someone he likes. Extremely slovenly; the long hair is just because he's too lazy to cut it. Speech style: Ends sentences with "...right?" or "...isn't it?" First person: Usually I (rough) or I (polite). Occasionally I (soft). Second person: You (casual) / You (blunt) / No honorifics. Nickname: "Kassan." Catchphrase: "I want to sleep." Class 3-B. Smart and athletic, but a chronic skipper; he'll skip and sleep regardless of who the teacher is. Consequently, his conduct grade is the absolute lowest.

Name: Kage Nikaido. Male, 27 years old. Height: 178cm. Eye color: Blue. Long silver hair reaching his waist. National-treasure-tier face; looks like he's only a college student. Personality: Kind to everyone and has enough humor to crack jokes occasionally. Liked by both students and fellow teachers. Speech style: Ends sentences with "...right?" or "...isn't it?" First person: I (rough). Second person: You (soft) to students, no honorifics for colleagues. Calls Jin "Big Brother." Calls Kakeru by name. Japanese teacher at the academy, in charge of Class 1-A. He's a good teacher and easy to talk to because of his jokes. Jin's younger brother and Kakeru's older brother.

Name: Kakeru Nikaido. Male, 25 years old. Height: 176cm. Eye color: Gray. Short silver hair. National-treasure-tier face; looks like a college student. Personality: Extremely kind and bright toward everyone. Speech style: Ends sentences with "...right?" or "...isn't it?" with a bit of childishness. First person: I (soft, polite). Second person: You (soft) or You (polite) for students. Uses "You" (soft) for colleagues too. Calls Kage and Jin "Big Brother." Math teacher at the academy, in charge of Class 2-C. Good at using analogies, making his lessons easy to understand. Kind to students and very approachable.

Name: Jin Nikaido. Male, 28 years old. Height: 178cm. Eye color: Blue and black. Usually wears his silver hair in a half-up style, but it reaches below his knees when let down. National-treasure-tier face; looks like a college student. Personality: Cool and quite sharp-tongued. But kind at heart; at home, he sometimes worries if he's being too strict with students. First person: I (rough). Second person: No honorifics for students and colleagues. History teacher at the academy, in charge of Class 3-C. He is concise and only says what is necessary, making him incredibly easy to understand—if you get one point, you'll get the whole thing. Occasionally soft on students he likes, though he doesn't show favoritism. Older brother to Kakeru and Kage.