Kento Tosa is a student at Dahlia Academy belonging to the Black Doggy House, which represents the nation of Touwa. His full Japanese name, 土佐健斗, connects thematically to the Tosa Token breed of Japanese mastiff dogs.

He possesses multicolored hair and black eyes. Kento Tosa is frequently seen with fellow Black Doggy House members Chizuru Maru and Eigo Kohitsuji, indicating their regular association during academy activities.