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Shirou Yoshida (吉田 四郎 / サンファイアー)Shiro's mother died out of radiation poisoning when he was still a young child. Shirou (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.
(Source: Marvel Database)