Kyōya, whose full name is Minami Kyōya, is the main protagonist of the series. He is a first-year high school student originally from Aomori who moves to Tokyo to audition for the music and hero unit SI-VIS after being inspired by his cousin, YOSUKE, who is the unit's leader and a major influence in his life. Kyōya is described as a bright and lively boy with a friendly and approachable personality. He is known as a grandmother's boy, which reflects his affectionate and warm nature, and he quickly gets along with others. Despite his outgoing demeanor, he also possesses a surprisingly delicate and sensitive side. He has excellent athletic abilities, which aid him in the physical demands of his role, but he struggles with academics as a running gag. His central motivation is his admiration for YOSUKE and his desire to join SI-VIS, and as the main character, he is at the heart of the story's growth and development, evolving through his interactions with other members of the unit and the challenges he faces. Key relationships include his deep bond with his grandmother, his admiration for his cousin YOSUKE, and his developing connections with fellow SI-VIS members such as Sōji, Nagi, and others, which are central to his journey. His notable abilities include his physical prowess and his natural talent for performance, which he hones through the audition process and active participation in the unit's activities.