Shota Yamaguchi functions as the information specialist for the main group, gathering intelligence on rival plawrestlers and their modelers. He bursts with hyperactive energy, often seen running in a unique personal style during operations. His personality blends flirtatiousness with a loudmouthed tendency to make snap judgments based on first impressions, yet he exhibits serious dedication to his duties.

As the intelligence gatherer, his core responsibility involves researching opponents' strategies, capabilities, and weaknesses to aid tactical planning. This demands constant vigilance and active networking within the plawrestling community. He operates within Sanshiro Sugata's core team alongside mechanic Tetsuya Hasegawa and programmer Shinji Murao, providing vital reconnaissance while they handle technical or combat roles. His energetic presence creates a distinct contrast, especially when paired with more reserved teammates.

Throughout the series, Shota remains a consistent ally, participating in tournaments and confrontations against antagonists. His loyalty endures during conflicts involving military exploitation of plawrestling technology and Sanshiro's mission to honor his father's legacy. He exhibits no evolution in character beyond his steadfast team support.