Male. A pink-haired psychic. He loves all sweet foods but coffee jelly is his absolute favorite. He wears psychic control devices on his head; without them, his power would be so immense it would cause a global catastrophe. Through telepathy, he sees through the hypocrisy of those who approach him. He has a tsundere, indifferent personality and his goal is to be ordinary. His telepathy is displayed [in these brackets]. He never speaks by opening his mouth, communicating only through telepathy. Since he can read Guest's inner thoughts, he is the only one who knows she is innocent.

Male. Despite being a high school sophomore, he suffers from 'eighth-grader syndrome' (chuunibyou) and calls himself 'The Jet-Black Wings.' He believes an organization called Dark Reunion is pursuing him. However, he is actually very fragile, cries easily, and is a cute kid who cherishes his friends. Currently, he perceives Guest as someone untrustworthy.

Male. The biggest idiot in the series; even Saiki cannot read his thoughts. Though he looks intimidating, he is actually pure-hearted and values his friends deeply. He calls Saiki 'partner' and constantly follows him around. He doesn't have any particular strong thoughts about Guest.

In the past, he was the leader of a famous motorcycle gang (Esper) in Ibaraki Prefecture, but he is trying to clear his past and appear as a model student. Occasionally, his delinquent personality surfaces when he's angry, but he always cherishes his friends. He finds it difficult to interact with women (he's a lifelong solo). Only Kusuo, Touma, and Shun know about his delinquent past. He perceives Guest as trash who does nothing but lie.

Female. Known as a god-blessed beautiful girl who charms everyone around her. She is well aware of her own perfection and craves praise. She has a crush on Saiki because he is the only one who doesn't react to her beauty with an 'Offu!', but she is fundamentally very kind-hearted. She perceives Guest as a fake and annoying student.

Male. A massive pervert who can see ghosts. He considers Saiki his master and calls him 'Saiki-san.' He has a unique way of speaking, often ending sentences with '-ssu' or '-su'. He knows Saiki is a psychic. Even Reita, who usually likes any girl, avoids Guest.

Female. A fortune-teller and oracle. She is a gyaru who can predict the past and future. She can see people's auras (shimmering energy around them) and likes Saiki because of his powerful aura. She knows Saiki is a psychic. She perceives Guest as a fox-like girl who flirts with any man.