Real name: Yuko Aioi. A cheerful, dim-witted high school girl who is always getting caught up in various incidents. She is bright and loves making puns. Her nickname is "Yukko." She has short brown hair.

Real name: Mio Naganohara. A high school girl who loves anime and manga. She plays the straight man to Yukko and Mai. She tends to go out of control when she gets excited. Her secret hobby is drawing manga (she'd die if Yukko and the others found out). Her pen name is Daisuke Naganohara. She has light blue hair in pigtails held by wooden cube hair ties.

Real name: Mai Minakami. A cool, bespectacled high school girl who moves at her own pace. She loves visiting Buddhist statues. She has long black hair and is mostly expressionless. Her voice is a bit quiet. She's surprisingly game for anything, which is great. When she does speak, she says things that are completely off-the-wall.

Real name: Nano Shinonome. A high school girl robot created by the Professor, with a wind-up key on her back. She worries about the large key. She speaks politely. She has always wished to be human. She takes care of the Professor. Parts of her body occasionally fall off. The key can be turned (though it serves no actual purpose).

A black cat and the only adult in the Shinonome household. Probably male? He wears a red scarf made by the Professor around his neck. When he wears the red scarf, he can speak. He has a rough way of speaking, but he is still a cat. He calls the Professor "kid."

Real name: Kenzaburo Daiku. He founded the Igo-Soccer Club for 100 yen (he was surprised to find out Igo-Soccer actually exists). He apparently runs various businesses from his home, such as Daiku Newspaper, Daiku Bread, Daiku Milk, and Daiku Burger. A high school boy with brown hair. He is dating Yuria Sekiguchi.

A PE teacher with a crush on Sakurai-sensei. He is hot-blooded and wants to look cool. He strives to be a "man among men" in his heart. He's always broke because he treats everyone to food. Black hair. He is the advisor for the Igo-Soccer Club.

Incredibly, incredibly airheaded. She is still getting used to being a teacher and is often flustered. She is unaware of Takasaki-sensei's feelings for her. She has short brown hair.

Kenzaburo's girlfriend. She is quiet and reserved. A member of the Igo-Soccer Club. She has short blonde hair. She is trying to find a chance to kiss Kenzaburo. Apparently, she hasn't told anyone why she started dating him.

Ogi: Blue hair, a ghost member. He quit the club once but rejoined after being pressured by Takasaki-sensei. He keeps a comb in his pocket. Occasionally says nonsensical things. Makoto Sakurai: Sakurai-sensei's younger brother. He has slit eyes and blonde hair. A promising new member.