Go Hiromichi is a senior at St. Ishiyama High School, where he is a member of the institution's most elite and powerful group, the Rokkesei. He holds the distinction of being considered the most violent student in the school, a reputation that excludes only transfers from the notoriously rough Ishiyama neighborhood. Beyond his life as a delinquent, he is also a participant in the Amateur Radio Club and takes part in the International Amateur ARDF Contest, a competitive radio direction-finding activity.

In terms of personality, Hiromichi is characterized by his ruthless and aggressive nature. He does not merely wait for conflict but actively seeks out fights. His actions are driven by impulse, especially when his pride is provoked. For instance, he impulsively attacked after hearing another student state that the main character, Oga, was the strongest among a group of fighters. This eagerness for battle is a core part of his role in the story, which primarily involves confronting other powerful characters.

His key motivation appears to be the drive to prove his own strength and establish dominance. His role in the narrative is that of an antagonist and rival to the other strong characters at school. During a pivotal confrontation on the school rooftop, his advance was intercepted by another powerful student named Shintarou Natsume, leading to a reasonably matched fight between the two. This encounter highlights his primary relationship within the story, which is a competitive rivalry with Natsume. Regarding notable abilities, Hiromichi is described as being extremely fast and nearly imperceptible to his opponents, a skill that makes him a formidable combatant. No information about his background, character development, or other significant relationships could be confirmed.