Gai Shishiou is the main protagonist of the anime series Yuusha-Ou GaoGaiGar. Once a courageous astronaut, Gai was mortally wounded during a Zonderian attack, but was revived as a cyborg by the GGG organization. As the pilot of the super robot GaoGaiGar, he leads the battle against the Zonder threat. Known for his indomitable spirit and strong sense of justice, Gai inspires his teammates and demonstrates unwavering bravery in the face of overwhelming odds throughout the series.