Hyoma Aoi is the hot-blooded and passionate leader of the Combat Team, serving as the pilot of the Battle Jet, which forms the head of the super robot. He is a tall young man with reddish-brown spiky hair and a well-built physique, typically dressed in a red bodysuit with a prominent yellow V emblem on his chest.

His background is marked by tragedy, as he lost his parents in a car accident at a young age and was subsequently raised in an orphanage called the Sun Academy. This experience of growing up without parents is a deep-seated source of pain for him, and he carries a complex about being an orphan. Consequently, he has a particularly strong protective instinct towards children and other orphans, and any threat against them becomes a powerful trigger for his righteous anger.

In terms of personality, Hyoma is defined by his energetic, impulsive, and determined nature. He has a strong sense of justice and often prioritizes the safety of his teammates and civilians over tactical objectives. He leads the team with a strong will and a focus on moral integrity, which once led him to confront a lazy ally. His passion for speed makes him an avid motorcyclist, and his reckless driving, which often involves high-speed chases with the police, is a hallmark of his character before and during his time as a pilot. Despite his impulsive exterior, he is capable of understanding the feelings of others and demonstrates strong responsibility.

His role in the story is central as the leader of the five pilots defending Earth from the alien Campbellian invaders. He coordinates the team through numerous crises, from direct combat to personal emergencies within the group. Early in the series, Hyoma suffers a critical injury when the Campbellian general Garuda destroys both of his arms. He receives cybernetic prosthetic replacements, but these artificial limbs are not without flaws; they can malfunction or go numb at inopportune moments due to rejection reactions. Despite the pain and disability, Hyoma undergoes secret rehabilitation and continues to pilot his machine, embodying the spirit of a determined fighter who refuses to be sidelined.

Key relationships shape his development significantly. He shares a complex dynamic with his rival, General Garuda. Initially enemies, their conflict evolves into one of mutual respect, with Garuda acknowledging Hyoma as a worthy opponent. Hyoma also has a deep, evolving bond with his teammate Chizuru Nanbara, the granddaughter of Combattler V's creator. Their shared experience as orphans fosters a deep empathy between them, and Hyoma's protective instincts are amplified upon learning of Chizuru's hidden heart condition. While initially dense about romance, he eventually becomes aware of her feelings, and their relationship develops into a romantic one by the end of the series. Within the team, he initially experiences friction with fellow pilot Juuzo Naniwa due to their contrasting personalities, but they grow to become the most like-minded of colleagues.

Throughout the conflict, Hyoma demonstrates notable personal abilities. Before becoming a robot pilot, he was a highly skilled biker and later proves himself to be a formidable hand-to-hand combatant. After losing his arms, he masters the use of his prosthetic limbs through sheer willpower. His combat skills are such that he is capable of dodging laser fire and defeating elite enemy soldiers in personal duels with a sword. His unwavering determination is perhaps his greatest asset, allowing him to fight on even when physically compromised. After the final defeat of the Campbellian threat, Hyoma chooses to remain with Chizuru rather than return to his orphanage, remaining vigilant for any future dangers to Earth.