Sunfire I
Nick Name
Civilian ID
Shiro Yoshida


Government Agent

Legal Status
Citizen of Japan with no criminal record.
Nation or Planet of Origin
Agarashima, Japan
Group Affiliation

Alpha Flight

Big Hero 6

Death's Champions


Pacific Overlords

(The) Twelve



Base of Operations
Tokyo, Japan
5' 10"
175 lbs.
Eye Color
Hair Color
Known Powers

Mutation resulting in an ability to generate and project blasts of super-heated plasma. Blast can be used in an offensive manner or be harnessed as a means of flight.

Excellent hand-to-hand combatant with training in the martial arts and traditional Japanese swordsmanship.

Common Enemies

Dr. Demonicus

Moses Magnum

Regularly Appearing

Alpha Flight Vol. 2

Sunfire & Big Hero 6

Uncanny X-MenX-Men Vol. 2

First Appearance
X-Men Vol. 1 #64 (Jan. 1970)
Roy Thomas & Don Heck

Years before he was conceived Shiro Yoshida's mother was exposed to radiation from the nuclear bomb dropped on Hiroshima by the United States at the end of World War II. After giving birth she died and Yoshida was left in the care of an uncle by his diplomat father.

While in the care of his uncle Yoshida was taught to be fervently anti-American. Suspecting his nephew was a mutant he was taken to the site of the Hiroshima bombing and upon contact with the irradiated soil Yoshida's mutation activated. Encouraged by his uncle, Yoshida mastered his abilities and vowed revenge upon the United States for his mother's death.

Attacking the United Nations and the Capital Building in Washington D.C., Yoshida was challenged by the X-Men. Persuaded by his father to cease his mission of destruction Yoshida's uncle fatally shot the diplomat. Driven to grief Yoshida in turn killed his uncle.

Protected by diplomatic immunity and considerable political wrangling, Yoshida returned to Japan to become its greatest champion, the mutant known as Sunfire.