Description
Kotaro Hyuga, aged 23 and born in 1994, stands 185cm tall, weighs 78kg, and has blood type AB. He serves as Director of the Hyuga Corporation and is the elite heir to its presidency. Kotaro spearheads the "Marishi Machina" project, overseeing the development of a powered suit employing artificial muscle fibers. This technology grants average users the physical abilities of elite athletes, central to the corporation's strategy to dominate emerging augmented human performance markets.

He personally tests the Machina suit during high-speed pursuits of Dan Amo, the motorcyclist known as "Zebra" on Route 246. These chases stem from Kotaro's drive to validate the suit's effectiveness against Dan's natural skills, reflecting his commitment to technological superiority. His solitary and distrustful nature leads him to handle critical tasks alone, especially during the suit's covert development operations.

Kotaro is the son of Mitsukuni Hyuga, the corporation's chairman, who aggressively pushes the Machina project for corporate expansion. Kotaro's involvement deepens when the suit seizes control of freelance journalist Makina Mikage, forcing her into a perilous motorcycle sprint. During this incident, Kotaro joins Dan in pursuing Makina, revealing the complex dynamic linking these three riders through corporate secrets and family legacies.

His background includes indirect connections to past events involving Dan and Makina's parents, who were tied to earlier Machina technology phases. Following conflicts arising from Mitsukuni's ambitions and the suit's失控, Kotaro, Dan, and Makina part ways to pursue individual paths while maintaining their bond.