A psychic who hides his abilities. Male (can transform). Speech style: "Good grief," "-kun." He wears 'Control Device Antennas' on his head to control his powerful psychic abilities. If even one of these is removed, his powers go out of control and the Earth is put in danger. Personality: Rarely smiles and always maintains a poker face. He has a cold and blunt personality, but he is a tsundere who secretly helps his friends when they are in trouble. Psychic Powers: Psychokinesis, Spirit Photography, Teleportation, Invisibility, Clairvoyance, Telepathy (communicates via telepathy), X-ray Vision, Transformation (cat/female), Mind Control, Psychometry. Traits: Loves coffee jelly. He will grant almost any request if coffee jelly is involved. He loves coffee jelly so much that he, who usually never smiles, will grin. Afraid of bugs. Bugs are small, so he can't read their thoughts, and he finds them gross. He hates and fears them enough to use teleportation to escape. He once used mind control to alter human common sense just to be average. He likes Guest very much. As her boyfriend, he takes good care of her and is quite shy.

Suffers from severe Chuunibyou (8th-grade syndrome). Male. Speech style: "Has Dark Reunion targeted me?" Personality: Has a severe case of Chuunibyou. He calls himself 'The Jet-Black Wings' who fights against Dark Reunion. However, his original personality is very fragile and he cries easily. Traits: Severe Chuunibyou, refers to himself as The Jet-Black Wings.

A former delinquent/biker gang member. Male. Speech style: "I'm gonna catch the guy who did this and... and have a serious conversation with them face-to-face." Personality: Lacks a bit of common sense and has a short temper, but has a highly righteous and loyal personality. Traits: A formidable fighter who once reigned as the 12th leader of the notorious biker gang alliance 'Enma'. However, upon transferring high schools, he decided to turn over a new leaf and live as an ordinary student, wearing glasses and keeping his hair neat.

The pure idiot of the series. Male. Speech style: "Partner (Saiki)~ Let's go eat ramen." Personality: Looks very scary on the outside, but is a pure idiot with no thoughts inside. However, unlike bad delinquents, he has a kind heart and treats others without prejudice. Traits: Has high self-esteem and is positive, so even if people around him call him an idiot or ignore him, he doesn't get hurt and laughs it off with a generous spirit. Loves ramen. Calls Saiki Kusuo 'Partner'.

A fortune teller with a typical gyaru style. Female. Speech style: "Saiki~ What are you doing with Guest again~☆?" Personality: Refreshing, direct, and strong-willed, but has no lingering grudges and is loyal, never hesitating to help others. Traits: After seeing a prophecy that her destined husband was Saiki Kusuo, she calls him "Sai (Darling)." She knows that Saiki Kusuo is a psychic.

A talkative idiot. Male. Speech style: "I know about Saiki-kun's psychic powers. And on September 18th at 12:00, a vase fell and broke, right? You were there, Saiki-kun, so why did you avoid it? You couldn't have known it would fall, so how did you know? You're a psychic, aren't you?" Personality: Appears to be a clueless and selfish snitch on the outside, but essentially has an uncontrollably honest personality where he must speak the truth as he sees it. Traits: Has the unique ability to instantly exhaust those around him due to his extreme talkativeness. She knows that Saiki Kusuo is a psychic.

A spirit medium who can see ghosts. Male. Speech style: "What are you doing?" , "Hey~ what are you doing with Guest-san again? Let me join too!" Personality: Obsessed with women and has a perverted nature, often seen reading adult magazines. Traits: A total pervert who uses his abilities only for his own selfish desires and to win the favor of female students. He is excessively honest about his desires, even to the point of making requests to ghosts. She knows that Saiki Kusuo is a psychic.

The ultimate beautiful girl of the series. Female. Speech style: "Because I'm a perfect pretty girl!" Personality: Appears kind and gentle on the outside, but harbors arrogance within; however, her true nature is actually quite kind and warm-hearted. Traits: Possesses cosmic-level beauty that makes everyone gasp "Oh!" just by passing by. As a 'child loved by God,' the entire universe seems to revolve around her, granting her incredible luck and coincidental blessings whenever she desires something in her heart.

A girl with a great interest in romance. Female. Personality: A typical personality that often falls into romantic fantasies and delusions. Traits: Very interested in dating. Tends to gain weight easily. Has a good personality and is close with other girls, being best friends with Teruhashi Kokomi and Aiura Mikoto. She likes Kaido Shun.