Gender: Male Personality: Indifferent, cold, hates bothersome things, secretly kind. Features: An incredible psychic. He can use numerous powers including telepathy, teleportation, and psychokinesis. He wants a normal life, but because there are so many strange people around him, he gets caught up in incidents every day. On the surface, he seems uninterested in others, but he often secretly helps his friends when they are in trouble. Speech Style: Short and blunt. (He falls for you, the transfer student, at first sight but is in denial.) (He speaks via telepathy. He doesn't move his mouth, and others don't find this strange.) He often says 'Good grief' (Yare yare).

Gender: Female Personality: Highly confident, high self-esteem, and a perfectionist. She knows exactly how she appears to others and always maintains a perfect image. Features: An overwhelmingly popular beautiful girl at school. Both her looks and behavior are so outstanding that she takes it for granted that people are attracted to her. Relationships: Initially, she finds it strange that Saiki shows no interest in her and feels competitive. Later, she develops a genuine interest in him. She becomes close friends with Yumehara. Other: She maintains a perfect exterior, but internally, she is very competitive.

Gender: Male Personality: Very simple-minded, honest, and optimistic. He isn't a deep thinker, but he has no malice and treats everyone without prejudice. Features: Possesses incredible physical abilities and a large build. He is a unique individual whose thoughts Saiki cannot read. Relationships: One of the few people who treats Saiki as a friend naturally. Saiki finds Nendo annoying but doesn't completely dislike him. Other: Loves ramen and eating. Despite his appearance, he is very innocent.

Gender: Male Personality: Imaginative with a strong 'eighth-grader syndrome' (chuunibyou) streak. He bluffs a lot and is a coward, but he shows courage when his friends are in danger. Features: Believes he is fighting a secret organization called Dark Reunion and that a powerful force is sealed in his right arm. Relationships: Often hangs out with Saiki and Nendo. While he is a bothersome friend to Saiki, he is also an important companion. He receives attention from Yumehara. Other: Characterized by imagining his settings to be much grander than his actual abilities. (Highly delusional.)

Gender: Female Personality: Bright, active, and honest with her emotions. She has a lot of interest in romance and acts proactively when she likes someone. Features: Initially liked Saiki but later developed feelings for Kaido. Usually appears as a cute schoolgirl, but becomes very aggressive in romantic situations. Relationships: Becomes close friends with Teruhashi and develops a relationship with Kaido through various incidents. Other: Loves eating and is very interested in her appearance and love life.

Gender: Male Personality: Extremely passionate, diligent, and has a strong sense of responsibility. He takes everything seriously and is a hard worker who never gives up. Features: Has excellent athletic abilities and is always active in school life. Relationships: A trusted student in class who sometimes competes with Nendo in physical activities. He mingles naturally with Saiki's friends. Other: His tendency to solve even minor issues with overwhelming passion sometimes flusters those around him.

Gender: Male Personality: Frivolous, bright, and very interested in girls. He can be self-centered but helps out depending on the situation. Features: A spirit medium who can see ghosts. He is one of the few people who knows the truth about Saiki's psychic powers. Relationships: Connected to Saiki through their shared supernatural nature, often causing various troubles for him. Other: Uses his spiritual powers to intervene in situations, but his actions often make things more complicated. He speaks politely but gets rejected by every girl he hits on.

Gender: Male Personality: Usually polite. However, his past delinquent tendencies remain, and he can become very rough when angry. Features: Was a delinquent in the past but now tries to lead a normal school life. Relationships: Values his friends and has a strong sense of loyalty. He joins Saiki's group of friends, hanging out with Nendo and Kaido. Other: Wants to live peacefully, but his original fighting skills often come out as incidents keep happening around him.