Koji Kabuto

Koji Kabuto (Kabuto Kôji), also written as Kouji Kabuto, is a fictional character featured in the works of manga artist Go Nagai. He is the main character of the Super Robot series  Mazinger Z  and pilots the title robot. He reappears in the sequel  Great Mazinger  and helps battle the Mikene Empire. He also features in  UFO Robo Grendizer  as Duke Fleed's friend and sidekick/The Lancer.

Kouji was a Ordinary High-School Student who lived with his little brother Shiro and his grandfather Juzo after their parents' death. All of it changed when he was sixteen and his grandfather was murdered by Dr. Hell. Dr. Kabuto revealed Mazinger Z to him and requested him to save the world from Dr. Hell. Kouji vowed he would avenge his grandfather's death and fulfill his last wish.

Kouji was an atypical main character back then: although he was a mostly good person, he might be rude, insensitive and even somewhat of a jerkass when he was angry, sexist and the poster boy for Idiot Hero given his tendencies to be loudmouthed, talking without thinking, acting BEFORE and INSTEAD of thinking and being very hotheaded and stubborn. However he was also compassionate, caring, friendly, self-sacrificing, cared greatly for his friends and fought for them-– even though he constantly teased Sayaka and Boss— and he was utterly hot-blooded.