Comandante Robinson, also known as General Oka in the original Japanese version, leads the Earth Defense Force and co-designed the robot Voltes V. He is the father of Jamie Robinson (based on Megumi Oka), whom he trained extensively in ninjutsu from childhood, emphasizing discipline and combat readiness. His military background forged a rigid command style demanding absolute obedience, with severe consequences for perceived insubordination or desertion.

This strictness defined his relationship with his daughter. Despite initial pride in her skills, he harshly reprimanded and physically struck her for leaving her Voltes team post to save him during an attack, viewing it as desertion. He enforced her confinement for four days, disregarding her injury and successful intervention, believing military protocol superseded personal bonds.

Robinson's character arc involved significant sacrifice. Battling terminal cancer, he resigned from the Earth Defense Force to spend time with Jamie, revealing his illness only after leaving. His death occurred when Boazanian general Oslak used a mind-controlling ring to force Jamie to attack him. Robinson freed her from the control but was shot by Oslak during the confrontation. Before dying, a final letter expressed immense pride in Jamie, revealed his illness, and shared his wish to create lasting memories with her. His sacrifice provided the Voltes team critical time to regroup during the battle, serving as atonement for his previous harshness.

His legacy centers on his role in Earth's defense, his complex relationship with Jamie balancing protectiveness with excessive discipline, and his ultimate act of paternal love amidst personal tragedy.