Random first appeared as a bounty hunter with the power to adapt his body to counteract any mutant power and to fire projectiles from his gun-morphed forearms. He is citizen of the nation of Krakoa.
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History
FIRST APPEARANCE: X-Factor Vol. 1 #88 (March 1993)
Marshall Evan Stone III was born in Albany, New York.
When his mutant nature manifested, Marshall sought aid in controlling his body's now-protoplasmic state. Help came in the form of the Dark Beast, who gave Stone control in exchange for his services as a superhuman operative for X-Factor. Though still only a young boy, Stone used his powers to make himself appear larger and older, becoming the bounty hunter Random.
As a bounty hunter, he took down a mutant suspect, a serial killer, and Speed Demon, but didn't kill any of them.
He established himself in Albany with a housekeeper and mother-figure Vera.
At some point a thief, he killed Charlie Ronalds's parents Harry and Robin while the family was leaving a screening of the 1966 Batman movie. Charlie Ronalds grew up with a hatred for mutants.
Random was eventually welcomed to the new mutant island of Krakoa, created by Xavier, Magneto, and Moira X. He entered through the teleportation gateway alongside other villainous and fractious mutants, who had been invited to join the nation in order to heal mutantdom and start over as a whole species together.