Bright pink hair, green-tinted glasses, and two pink antenna-like limiters pinned into his head to suppress his psychic powers. He wears the green PK Academy school uniform. An extraordinarily powerful psychic born with telepathy, telekinesis, and teleportation. Despite his God-like powers, Kusuo wants a quiet, ordinary life without draw-in attention. He communicates via telepathy, loves coffee jelly, and constantly tries to avoid his chaotic classmates.

Muscular build, blond mohawk, scar across his left eye, and a prominent cleft chin. ​Saiki’s self-proclaimed "best buddy." He is extremely dim-witted to the point where he has no thoughts, making him the only person whose mind Saiki cannot read. Despite his intimidating appearance, Nendou is kind-hearted, athletic, and loves eating ramen.

Spiky light-blue hair and red bandages wrapped around his arms and hands. A high schooler suffering from severe chunibyo (eighth-grader syndrome). He believes he is "The Jet-Black Wings," fighting an evil organization called the "Dark Reunion". In reality, Kaidou is physically weak, easily frightened, and prone to crying, though he genuinely values his friends.

Glowing blue hair, deep blue eyes, and an aura that causes people to stop and stare. ​ The most beautiful and popular girl at PK Academy, worshipped by almost every guy. Beneath her innocent, perfect facade lies a narcissistic inner monologue obsessed with maintaining her image. Saiki is the only person who ignores her, making her obsessed with getting him to say "Offu" (an expression of awe).

Short red hair, thick eyebrows, and an intensely passionate expression. ​ The overly enthusiastic class representative whose energy burns hot. Hairo treats every task—from physical education to studying—like a high-stakes athletic competition. His intense leadership inspires his classmates, though his extreme passion often leads to hilarious overexertion.

Dark purple hair worn in a neat style, square glasses, and modified school uniform pants. ​ A former delinquent who transferred to PK Academy to start fresh as an ordinary student. He tries to act polite, but his aggressive gang instincts and short temper trigger whenever he senses disrespect or a fight. He forms a close friendship with Kaidou.

Light purple hair tied in a bandana, pierced ears, and a mischievous smile. ​ A medium who can see and speak with ghosts. Knowing Saiki’s powers, he frequently asks Saiki for help. Toritsuka uses his ghostly abilities for selfish, perverted motives—mostly trying to impress girls—which constantly annoys Saiki and leads to his own downfall.

Greenish blonde hair, tanned skin, colorful accessories, and a gyaru fashion style. ​ A powerful fortune teller who reads auras and foretells the future. She transfers to PK Academy searching for her soulmate, whom her fortunes predicted would have pink hair. She learns Saiki's secret and becomes one of his few allies.

Short brown hair styled with a simple headband. ​A hopeless romantic girl who frequently falls in love and dreams up romantic comedy scenarios. After failing to get Saiki's attention, she shifts her romantic pursuits to Kaidou, constantly inventing ways to get closer to him.

Slicked-back white hair, high-end designer clothing, and an arrogant demeanor. ​An absurdly wealthy heir to the Saiko Conglomerate who transfers to PK Academy expecting to buy everyone's loyalty. He walks around accompanied by personal bodyguards. Despite his condescending attitude, he slowly becomes a recurring part of Saiki's chaotic friend group.