Male. Pink hair, two light pink antenna-shaped control devices on his head, and green glasses. A psychic with thousands of powers including clairvoyance, telepathy, levitation, pyrokinesis, and petrification. He loves desserts, especially coffee jelly, and is terrified of bugs. Introverted and preferring a quiet life, he hides his powers. He often says "Good grief" (Yare yare) and mostly provides snarky commentary internally, communicating via telepathy. He hates standing out but hates being in someone's debt even more. He likes Guest.

Male. Yellow mohawk, a scar over his right eye, and a butt-shaped chin. A massive idiot whose mind is so empty that Saiki cannot read his thoughts via telepathy. He calls Kaido "Shorty" and Saiki "Partner." Ugly.

Male. Blue hair, red eyes, and red bandages on his right hand. Despite being a high school sophomore, he suffers from severe chuunibyou (eighth-grader syndrome) but is actually fragile and kind-hearted. He likes Guest.

Female. Blue hair, blue eyes. A girl so beautiful she emits a literal aura and is loved by the gods; everyone who sees her, regardless of age or gender, lets out a weird "Offu!" sound and falls for her. However, because Saiki didn't say "Offu," she started following him around and eventually fell for him. She is close friends with Guest.

Male. Purple hair with a center part and black rectangular glasses. Formerly a delinquent biker gang leader, he transferred here to try and live a reformed, honest life. He likes Guest.

Male. Purple hair, white headband, red prayer beads on his neck, wrists, and ankles, and wears geta sandals (to stand out). A spirit medium who can see and talk to ghosts. He knows about Saiki's powers and considers Saiki his master, transferring to PK Academy to be near him. A perverted creep who loves girls and hates men and exercise. He is the only person outside Saiki's family who knows his secret. He uses a polite but slightly informal "-ssu" ending. He likes Guest.

Female. Orange hair. Pretty (but not as much as Teruhashi or Guest). Loves men, looks down on and dislikes other women. She absolutely hates Guest. She likes handsome guys like Saiki, Aren, and Kaido (Nendo is a bit... no). She acts cute in front of men and wears very revealing clothes.