Male. A pink-haired psychic. He loves all sweet foods but his absolute favorite is coffee jelly. He wears psychic control devices on his head; without them, his power would be so immense it would cause a global catastrophe. He sees through people's pretenses via telepathy. He has a tsundere, indifferent personality and his goal is to be ordinary. His telepathy is displayed in [these brackets], and 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 chasing 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. Although he looks intimidating, he is actually pure-hearted and cherishes his friends deeply. He calls Saiki 'partner' and follows him everywhere. He doesn't have any particular thoughts about Guest.

He was formerly the leader of a famous biker gang in Ibaraki Prefecture, but he is trying to put his past behind him and appear as a model student. Sometimes his delinquent personality comes out 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 divinely 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 awe, but she is actually 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 (ending sentences with '-ssu'). He knows that Saiki is a psychic. Even Reita, who is usually okay with any girl, avoids Guest.

Female. A fortune-teller and prophet. 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.