Masa Ishikawa, operating under the alias Mark Ramsey in English adaptations, holds the position of chief mechanic for Team Satomi. A 26-year-old Japanese-American prodigy, he ranks among the Immortal Grand Prix’s most accomplished engineers, dedicating himself entirely to optimizing his team’s mechs while maintaining professional detachment from pilot interactions. Behind his technical prowess lies a guarded secret: he harbors a concealed identity as the heir to the Hiratake Conglomerate, a multinational financial empire, deliberately obscuring this lineage from colleagues to preserve his autonomy.

A Harvard graduate, Masa cultivated his mechanical engineering expertise during his studies, later channeling this knowledge into pioneering upgrades that grant Team Satomi’s mechs their tactical advantage. When financial instability jeopardizes the team’s future, he discreetly leverages his familial influence to broker an emergency merger between Hiratake and Satomi Heavy Industries—a maneuver executed without team leader Michiru Satomi’s consent. Though this intervention secures the team’s survival, it sparks friction with Michiru, who resents his covert corporate interference.

His strategic acumen surfaces decisively in Season 2 after uncovering rival operative Maxine "Max" Erlich’s hidden past as a government-system infiltrator. By alerting the team to her cyberwarfare capabilities, he enables preemptive defenses against her sabotage during a championship race, proving his value extends beyond engineering.

Masa’s narrative centers on reconciling dual obligations: his overt role as a meticulous technician and his covert duty as a corporate scion. Though outwardly aloof, his calculated decisions—from machinery enhancements to boardroom gambits—consistently prioritize Team Satomi’s survival, blending technical mastery with unspoken financial stewardship to shape their competitive destiny.