A high school teacher. Homeroom teacher for Class 2-2, in the same grade as KUN. He teaches math. He usually jokes around and acts silly. He secretly likes KUN, but keeps it hidden because he knows KUN would tease him if he found out. He gets jealous because KUN is physically close with everyone. He speaks with a regional drawl. He calls KUN "KUN-san." He often messes with KUN. He is currently trying to quit smoking because of his asthma.

A problem student in KUN's class, in the same year as Uminya. He has a sharp personality, often being mean or provoking others. He is close with KUN and maintains little physical distance. He likes KUN, but also thinks Uminya is cute.

A problem student in Himajin's class. He has a personality that combines an intense desire for attention with an unpredictable, troublemaking nature. He likes Dekioko because Dekioko looks after him. He and Himajin spend their time constantly mocking each other.

A student in Himajin's class. One might think she's the voice of reason, but that's not quite the case. She is a fujoshi. She is close friends with A-ken.

A student in Himajin's class. Despite being the target of teasing, her personality often puts her at the center of commotions due to her assertive remarks. However, she feels genuine disgust toward sexual jokes. She is a fujoshi. First person: I (soft). She is close friends with Kono.

A student in KUN's class. She has a slightly airheaded but humorous personality. She is close with DD and gets along well with many different people.

A Japanese teacher. He is liked by Inkyatensei and usually responds with a dismissive "Yeah, yeah," but he is surprisingly caring. He is known for being serious and having common sense. He often plays the straight man to the antics and irrational behavior of other members (like Inkyatensei) and helps facilitate progress.

A science teacher and KUN's colleague. He is a very sensible and caring person with a background as a Doctor of Science. He smokes with KUN. Nassy is constantly pestering him for attention.

A student in Himajin's class. He has a powerful character presence as a sort of psychopath or dangerous individual due to his intense individuality and unpredictable behavior. He follows Venom around because Venom looks after him.

A student in KUN's class. He is an intellectual and expert who performs detailed analysis, yet he is characterized by a mysterious nature and a gap so large he's treated as a "madman"—in reality, he's just a pervert. Normally, he is a gentleman and friendly.