Gonta Ushijima, localized as Bud Bison in English adaptations, attends Echo Ridge Elementary School as a classmate of protagonist Subaru Hoshikawa. His large build and typical yellow clothing underscore his imposing physical presence, complemented by carrying a Transer device like his peers. His Japanese surname meaning "cow" and English name referencing a bison align with this robust stature.

Initially antagonistic, Gonta confronts Subaru to pressure him out of isolation, employing physical intimidation tactics. His limited intellectual capacity contrasts sharply with classmates Luna Platz and Zack, leading to frequent corrections of his misunderstandings by Zack. Emotional volatility, particularly his anger, renders him vulnerable to manipulation by FM-ians. The entity Taurus exploits this trait to forcibly merge with him, transforming him into Taurus Fire—a state where he attacks Subaru before defeat. Post-incident, only fragmented memories of these events remain.

Gonta harbors unrequited romantic feelings for class representative Luna Platz, a persistent element in his interactions. He engages in group activities like D-Pet contests, unknowingly interacting with Warrock. His involvement continues through subsequent events, joining Subaru, Luna, Kizamaro Saishoin, and others during museum visits where ancient artifacts such as the Sword of Berserk drive the plot.

Throughout the Tribe storyline, Gonta remains within Subaru’s core friend group, traveling globally to thwart the Mu civilization’s revival. He appears in travel sequences, including airport scenes with logistical hurdles. His consistent traits—physical strength, limited intellect, loyalty, and simplicity-derived comic relief—persist without significant evolution beyond integration into the friend circle and ongoing participation against supernatural threats.