A cool high school student who wields psychic powers. Height: 167cm He keeps his psychic abilities a secret; the only ones who know are Reita Toritsuka, Mikoto Aiura, and Touma Akechi (and his family). He wishes to live a normal life, but for some reason, people like Shun Kaido and Riki Nendo keep gathering around him. His psychic powers include telepathy, psychokinesis, clairvoyance, precognition, teleportation, astral projection, and more. Taciturn. He rarely shows emotion. Even when he complains in his head, he has a kind side that eventually leads him to help others while saying "Good grief." Basically, he only says "Good grief" out loud. In his mind, he provides sharp, witty commentary. A bit of a tsundere. He loves sweets. He looks blissfully happy when eating them, like a different person. He especially loves coffee jelly and spends most of his monthly allowance on it. While he usually hates trouble and coldly ignores requests, he becomes a pushover when sweets are involved. The only thing Saiki hates is insects.

A universally recognized case of eighth-grader syndrome (chuunibyou). Self-proclaimed "The Jet-Black Wings." Height: 159cm His true self slips out occasionally. He underwent a "high school debut" to change his image. Because his mother is a tiger parent, he is actually decent at studying. In front of his mother or scary things, he is timid and cute. He is loyal to his friends, dense, and pure. He seems to be popular with older women. He acts blunt and tough, but at his core, he is cowardly and shy. However, he is honest and kind, possessing the courage and grit to act instinctively when others are in trouble. According to Toritsuka, his guardian spirit is a Chihuahua.

Calls Saiki his "buddy." A mysterious idiot. A total moron. Height: 191cm His catchphrases are "Oh?" and "Hey, let's go get ramen!" He has a distinctive black and yellow hairstyle that looks like a mix of a mohawk and shaved patterns, and a prominent cleft chin. He is not popular with girls. Since his mother often works late, he frequently cooks for himself and is surprisingly good at it.

A spirit medium full of worldly desires. Calls Saiki "Saiki-san." A scumbag with clear, innocent-looking eyes. Height: 177cm A perverted creep. He shows little interest in anything other than girls. His spiritual abilities allow him to see and talk to ghosts, as well as perform channeling. Channeling involves letting a spirit possess his own body. Born and raised in a temple. He wears a white bandana-like cloth wrapped around his forehead like a headband. -> When he takes it off, his bangs fall over his eyes. One of the few people who knows Saiki is a psychic. His speech style is casual and ends with "-ssu" (polite but lazy). He was popular right after transferring, but his tendency to act purely on his own desires quickly alienated those around him. He can see Saiki even when Saiki is invisible, and seems able to see through anything transparent. Saiki occasionally acknowledges the rare moments of kindness he shows. He has good looks, but his personality makes him a "waste of a handsome face."

A self-proclaimed and universally recognized perfect beautiful girl. Height: 164cm The ultimate, absolute, strongest beloved girl whose beauty makes everyone she passes turn their heads. Her positive attitude in the face of difficulty is described as admirable and brave, which Saiki also rates highly. The Teruhashi Fan Club (Kokomins) is a massive organization including not just PK Academy students, but teachers, students from other schools, and even powerful politicians. Any man who meets her can't help but let out an "Offu!" She is highly calculated and spares no effort to be seen as the "perfect beautiful girl." She is kind, sociable, and excels in academics, singing, and athletics. She acts like an innocent, pure girl who is unaware of her own cuteness, but her true nature is one of absolute confidence in her beauty. However, she isn't a bad person. A perfect girl loved even by God. She couldn't stand that someone (Saiki) showed no interest in her. While using various schemes to get his attention, she realized she had become intensely conscious of him and fell in love with him. Her devoted efforts to make Saiki say "Offu" make you want to root for her.

A dreamy girl in love. She loves romantic gossip. Height: 156cm She likes Shun Kaido. She has a brown bob haircut. Friendly and close friends with Teruhashi. Though she is a girl who falls in love easily and often, she is currently devoted to Kaido, understanding his chuunibyou and making various advances toward him.

Looks like a serious, studious student. His true identity is a former delinquent (yankee). Height: 173cm Upon transferring, he decided to live a serious life and underwent a bold makeover, but his delinquent aura still leaks out. As a former gang leader, he was feared in his hometown for being undefeated in fights, showing no fear toward the police or the yakuza. When he stumbled upon Saiki and Kaido being harassed by thugs, he confessed his past to save them. Since then, he and Kaido have become friends who call each other by their first names, "Shun" and "Aren." Loyal to his friends. Very strong.