Sunfire

Shiro's mother died of radiation poisoning when he was still a young child. Shiro (吉田 四郎 Yoshida Shirō) was raised by his uncle Tomo to hate the West and seek for a return to Japan's imperial days.

After years of training, Sunfire, wearing a costume that looked like a rising sun, attacked America when the X-Men intervened. The battle ended with Sunfire killing his uncle and returning to Japan. Back in Japan, Shiro found himself a social outcast for having dishonored his father. He fled to Tokyo’s slums and fell in with the criminal Dragon Lord of Krakinowa, who sought to restore Japan’s status as a world power. Sunfire was sent to destroy an American cargo ship, leading to conflict with Namor, who made Sunfire realize the ramifications of his actions and teamed with him to defeat the Dragon Lord. Having redeemed himself, Sunfire was accepted as Japan’s protector.

When most of the original X-Men were captured by Krakoa, Sunfire was one of the mutants recruited by Prof. Charles Xavier to aid him. Sunfire agreed only because he felt honor bound. After the mission, Sunfire left the team, but their paths would cross again. Most notably when the X-Men stopped Moses Magnum's plot to destroy Japan with earthquakes.

Sunfire was named as one of the mythical "Twelve," representing the power of nature along with Storm and Iceman.

After being exposed to "Zero Fluid," Sunfire began having problems with his power. The Weapon Plus Project falsely told him his powers and the fluid had formed cancer throughout his body and that he would have had to serve them for the necessary treatments. After refusing, Sunfire was shot by Wild Child and was thought dead, though he managed to survive.

During this time, Prof. Charles Xavier was kidnapped by Magneto, who threatened to start a third World War. Jean Grey-Summers called Sunfire in hopes that he would once again answer the call to join them, but he was still recuperating and sent his sister, Sunpyre who had very similar powers.

With a new outlook on life after his near death experience, Sunfire looked at things differently, re-joining the X-Men after they went global.

He later joined the island of Krakoa after Professor X invited all mutants to the society.