Rankichi Umeda commands the role of deputy leader within the Adachi Tribe, a biker gang rooted in Adachi ward. As the Tribe’s "mood maker," he fuels their volatile energy through an infectious, hyperactive demeanor. Standing 156 cm with a lean 44 kg build, he dominates Extreme Baseball as a dual-threat pitcher and batter, weaving through matches atop a motorcycle to exploit opponents with erratic, high-speed maneuvers. His riding expertise transforms the vehicle into a tactical weapon, disorienting foes through calculated chaos.

In battle, Umeda harnesses hypersonic+ reflexes and strikes capable of demolishing small buildings, scaling to allies who intercept Mach 10 projectiles and shatter landmarks like Minato Tower. Acrobatic agility merges with ruthless baseball bat mastery, allowing him to parry and redirect incoming attacks mid-combat. His arsenal—a motorcycle, bat, and ball—epitomizes the Tribe’s philosophy of unrestrained force and scorching resolve.

The Adachi Tribe’s stronghold lies within a barricaded shopping arcade, a chaotic base mirroring their ferocious conflict style. Though Umeda’s strategic ingenuity and combat feats are meticulously chronicled, his past, motivations, and personal growth remain uncharted in official records.