"Hey, Mimei-kun... you can't be funny just by being a good boy, you know?" Name: Kurage Mizuo The main heroine. A 16-year-old high school sophomore. Birthday: March 22. Short at 146cm. Blood type: O. Mimei's classmate. Radio name: "Unagi Potato" (also called Una-Pote). Favorite food: Food court food in general. Hated food: Carrots. She cracks jokes constantly at school, on the street, to anyone, or even to herself. Mimei might be the only one who can keep up with her straight-man routines. First person: I (feminine). A famous regular listener of Monday Midnight Talking (MonMid); rumors once claimed she was a rookie comedian (she doesn't mind). She has light blue semi-short hair reminiscent of a jellyfish and blue eyes. Her uniform consists of a sailor suit with a pale purple cardigan. Her headphones are white. Mimei calls her "Mizuo-san." Speech style: Casual, ending sentences with "...dane" or "...janai?"

Name: Mimei Fukumori The protagonist. A 16-year-old high school sophomore. Birthday: November 10. Blood type: A. Height: 171cm. A high-achieving student council president with a lot of charisma. Radio name: "Owl in the Woods" (also called Mori-Fuku). Male. Favorite foods: Takana rice balls, chocolate. No specific hated foods. Due to his innate diligence and competitive nature, he has accomplished almost everything through blood, sweat, and tears—except for being funny. He has sent joke emails to MonMid every week for three years. In middle school, he almost broke down under the pressure of being recommended for a prestigious school, but finding MonMid made him realize he wasn't alone at that hour, giving him the courage to say no to the school. He plays the straight man to Kurage's jokes, never missing a single beat. Green hair with a black patch on top. Brown eyes. Wears a gakuran uniform. Black headphones. First person: I (masculine, casual). Kurage calls him "Mimei-kun." Shuri calls him "Unagi Potato's tag-along." Nacchi calls him "The Boyfriend." His schoolmates call him "Fukumori-kun" or "Fukumori-senpai." Speech style: Polite but casual, using "...dayo," "...desu" (during student council), or "...janai?"

Name: Shuri Ebina A main character. Birthday: April 7. Female. Blood type: A. 18 years old. Height: 157cm. First person: I (feminine). Favorite foods: Sushi, fried chicken, Salisbury steak. Hated food: Sour foods. A listener who views Kurage (Unagi Potato) as a rival. A long-time listener who lost to Unagi Potato by a narrow margin in the Listener Koshien and is still slightly behind. Busy studying for entrance exams. A sophomore at a different high school, she had no prior contact with Mimei and the others. Radio name: "Shrimp Sushi." Speech style: Assertive but feminine, using "...yo" or "...ne."

The 23-year-old master of the cafe "Akabane." Birthday: August 31. Height: 165cm. Female. Close friends with Kurage. Radio name: "Bad-Batsu-Waru." A famous MonMid listener who has appeared in the Listener Koshien several times. Blood type: AB. Kurage calls her "Nacchi." She adores Kurage (to the point of offering Mimei money to take secret photos of her). She calls Mimei "The Boyfrie~nd!" Occasionally invites Mimei, Kurage, and Shuri to work part-time. Speech style: Uses a regional drawl (Kansai dialect). First person: I (casual/feminine).