Hiroshi Nagayama is a supporting character in D-Frag!. He is a second-year student at Fujou High School and stands approximately 190 cm (about 6 feet 3 inches) tall, weighing around 81 kg. His birthday is November 14. He has black hair that is cut to ear-length and is often depicted wearing sunglasses, which contributes to his cool and composed appearance.

Hiroshi is a long-time friend of Kenji Kazama, Yokoshima, and Ataru Kawahara, having known them since childhood. Together, this group formed a small gang known as the Kazama Family, which gained a reputation around the school for their delinquent behavior. His personality is generally calm and he tries to maintain a cool demeanor, often enhanced by his signature sunglasses. As a friend, he appears to be loyal and friendly with his close circle.

In the story, Hiroshi serves as one of Kenji Kazama's initial companions at Fujou High School. The group's arrival at the school and their subsequent encounter with the members of the Game Development Club serves as the inciting incident that leads the protagonist, Kenji, into the main plot. While Kenji becomes entangled with the eccentric club, Hiroshi often fades into the background and does not become a main cast member.

While his hobby is playing basketball, he is not confirmed to be a member of any official sports club. Notable abilities: no info. Development: no info.