Ranjiro Kiyama, alias Socho in Japan and Cap'n in English dubs, emerges as a pivotal character in *Beyblade Burst Turbo*. As Rantaro Kiyama’s younger brother, he sports a signature flattop blonde haircut, hazel eyes, and a left-cheek bandage, frequently clutching a green-and-yellow lollipop. His Turbo-era wardrobe features a flame-patterned white jacket over an orange shirt with two-toned pants, later evolving in *Surge* to a jagged flame jacket design paired with blue-orange trousers and a yellow-orange dress shirt. Initially wielding Raging Roktavor Gravity Revolve, he upgrades to Crash Roktavor 11Reach Wedge after defeating Fubuki Sumiye, establishing the Wild Bey Gang by recruiting Beigoma Academy defectors. His leadership blends fierce rivalry with loyalty, evident when aiding Aiger Akabane’s confrontation with resonance obsessions and sacrificing his Legend Festival slot to support an injured Hyuga Hizashi. Hot-tempered yet principled, Ranjiro fiercely retaliates against insults toward his hairstyle or skills—like chasing Hikaru and Hyuga post-“Broomhead” taunt—but honors rivals through actions such as his 149-battle draw with Aiger, culminating in mutual collapse and a pact to evolve. His arc transitions from brash overconfidence to tactical maturity following losses to Lui Shirosagi and Lain Valhalla, the latter shattering his Glide Roktavor Wheel Revolve 1S. These defeats spur introspection and collaborative growth, exemplified by his Double Tornado technique co-developed with Rantaro. Notable clashes span his Luinor Cup participation, repeated duels with Aiger, and mastery of Lightning Launch maneuvers via Glide Roktavor. In *Surge*, he mentors younger bladers while recovering from Lain’s devastating tactics. Relationships hinge on brotherly loyalty, rivalries with Lui and Phi, and alliances with Valt Aoi and the Hizashi siblings. Childhood admiration for Rantaro drives his ambition to exceed his brother, paralleled by protective instincts toward siblings Randira and Ranmira, whose narratives remain briefly outlined.