TV-Series
Description
Shirō Kabuto is the younger brother of Kōji Kabuto. After the apparent deaths of their parents, he resides with Kōji and their grandfather, Dr. Juzo Kabuto. Shirō becomes drawn into the conflict against Dr. Hell's forces following Dr. Kabuto's murder.

His appearance typically features brown or black hair and black eyes. He wears casual attire, often a green shirt with red outlines, jean shorts, and brown shoes, or in other adaptations, a yellow shirt with dark blue shorts and white sneakers. His personality combines friendliness and playfulness with occasional hot-headedness and impulsiveness. He shows strong loyalty and protectiveness toward Kōji, frequently worrying about his safety during battles. This protectiveness extends to teasing Kōji about relationships, though Shirō himself experiences loneliness when Kōji is occupied with piloting duties.

Shirō possesses notable intelligence and engineering skills, contributing to robot upgrades and modifications. Despite his youth, he demonstrates combat abilities, having been taught by Kōji to defend himself against bullies and larger opponents. In *Great Mazinger*, he pilots Robot Junior, holding his own against Warrior Beasts. His role in *Mazinkaiser* is more supportive during attacks on the Photon Power Lab, and he participates in comedic subplots, including showing lecherous behavior toward characters like Sayaka Yumi or the Lori and Loru twins.

Family relationships significantly shape his development. He initially resents his father, Kenzo Kabuto, upon discovering Kenzo survived an accident and built Great Mazinger in secret. Shirō eventually reconciles with him after learning Kenzo was manipulated by Dr. Hell. His friendship with Lorelai Heinrich ends tragically when she is revealed as a robot controlling a Mechanical Beast, leading to her destruction by Mazinger Z. Later, in *Great Mazinger*, he forms a close bond with classmate Haruka Shiratori, eventually referring to her as his girlfriend.

His battle involvement includes witnessing the near-destruction of Mazinger Z and supporting Kōji during Mechanical Beast attacks. He participates in group efforts, such as identifying impostors during security breaches at the Photon Power Lab. Across various media, his character evolves from providing comic relief to taking a more active role in conflicts, while his core traits of loyalty and occasional impulsiveness remain consistent.