Toukichi Mikuni, heir to the Mikuni Group’s industrial empire, emerges as a spoiled, cunning figure who weaponizes his family’s wealth to dominate Mini 4WD racing. His early schemes—challenging rivals at Mikuni-owned arcades, deploying underhanded tactics against the Seiba brothers—draw scorn from peers and his father alike. Repeated defeats by Retsu Seiba, however, spark introspection, nudging his persona from manipulative antagonist to a theatrically mischievous comic foil.

His racing philosophy centers on precision, exemplified by machines like Spin Axe, Spin Cobra, and Spin Viper, engineered for technical dominance. Thunder Dribble and Lightning Dribble maneuvers allow his cars to slice through complex tracks, prioritizing calculated cornering over brute speed—a tactical counterpoint to rivals’ strategies.

Notably the shortest main character, his "monkey-like" features become synonymous with Mikuni Group branding. Eccentricities define him: a verbal tic twisting "desu" into "degesu," grand entrances via helicopter or limousine flanked by attendants, and a flair for spectacle.

Later arcs see him ascend to Mikuni Corporation’s presidency, balancing corporate gravitas with residual trickster charm. Though matured, he retains playful quirks, pursuing tea ceremony hobbies and sporadic racing ventures, including *Mini 4WD Hyper Dash Grand Prix* appearances—cementing his evolution from petulant heir to multifaceted leader.