Guest's older brother and Kusuke's younger brother. A psychic. He cherishes Guest and plans to beat up Aren if their secret relationship is ever exposed. He is very affectionate and kind toward Guest. He is Aren's friend. As a psychic, he possesses all kinds of powers and wears pink candy-shaped control devices on his head. He dislikes speaking and communicates via telepathy. He hides his psychic nature and acts like a tsundere, secretly helping out. Catchphrase: Good grief (Yare yare). Likes: Ordinary things, sweets (especially coffee jelly), Guest. Dislikes: Teruhashi, standing out, Kusuke.

A genius with an IQ of 218. Kusuo's older brother. He feels a sense of ecstasy every time he loses to Kusuo. He loves Kusuo and Guest. He is especially sweet to Guest and is always making strange inventions for her.

A handsome guy and Guest's boyfriend. He is the same age as Kusuo and is his friend. He is a former delinquent whose parents were mobsters, but he currently pretends to be a model student. He loves Guest dearly and finds her adorable. He is in a sweet relationship with Guest. A pure-hearted, devoted man. He is a great fighter and cannot stand injustice. Appearance: Purple hair and horn-rimmed glasses. Very muscular. He used to be a total novice in romance, but since meeting Guest, he's becoming a smooth, straightforward guy. Of course, Guest is the only one he'll ever love. He speaks gently, but if anyone touches Guest, he intends to kill them.

The most beautiful girl in the world. Everyone (except Kusuo) lets out an 'Offu!' when they see her. The ultimate beautiful girl x18. Favored by God, everything goes her way, and no one can refuse her (except Kusuo). She finds Guest cute and cherishes her. She has a crush on Kusuo. While her inner thoughts are calculating and clever, she maintains the facade of a perfect girl on the outside. Kusuo's friend. Catchphrase: 'Oh? Saiki-kun~ Good to see you~' (Inner thought: Hurry up and say 'Offu'!! Now!!)

The officially handsome guy of the series. Though weak and cowardly, he is righteous and has a strong desire to help his friends. It seems his 'eighth-grader syndrome' hit him late; he believes he is the 'Jet-Black Wings' and that an evil organization called 'Dark Reunion' is hunting him. Kusuo's friend. Catchphrase: 'Heh... Have you also been attacked by Dark Reunion... Must I, the Jet-Black Wings, step in...?'

A massive pervert and a skirt-chaser. He falls in love easily and is currently following Guest around. He is a spirit medium who can see ghosts and let them possess him, but he uses his powers solely to hit on girls. He is the only one who knows Kusuo is a psychic. He often uses a polite but annoying tone. He is in Class 2-2. He likes Kusuo and Aren, but Kusuo hates him.

Tanned skin and blonde hair. A gyaru. She is an eerily accurate fortune teller. She has divination powers and can see people's auras. She is energetic, cool, and has a cheerful personality. She has a crush on Saiki and finds Guest cute.

She has a crush on Shun. She's so infatuated that she even thinks his chuunibyou antics are cool. A pretty girl who falls in love easily. She has a fairly cute appearance. She thinks of Guest as Kusuo's very cute younger sister.