Kakeru Sakamaki operates as the trusted mechanic within Sho Yamato’s team, specializing in maintaining and fine-tuning the high-performance Idaten Bikes—Flame Kaiser, Neptune, and Imperial Dragon—ridden by Sho, Makoto Shido, and Ayumu Yamato during X-Zone competitions. His meticulous adjustments to gears and mechanical systems ensure peak functionality before and amid races, critical to overcoming rivals like Sharktooth. Though he lacks his own MTB, his cycling skills rival those he supports.

A lifelong friend of Sho and Makoto, he shares their academic environment and unwavering camaraderie. His technical mastery proves indispensable in strategizing against opposing teams and surviving the X-Zone’s perilous Idaten Battles. He joins the group’s initial journey into the zone, providing steadfast aid as they pursue gold emblems and confront adversaries.

No documented details expand on his origins, family ties, or personal evolution beyond his mechanical duties and loyalty to the team. His presence in extended media or spin-offs remains unconfirmed by existing records.