Colossus
Real Name: Piotr Nikolaievitch Rasputin
Nickname: Peter
Universe : Earth-616
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Piotr Nikolaievitch Rasputin (Russian: Пётр "Питер" Николаевич Распутин) was born on the Soviet collective farm, called the Ust-Ordynski Collective, near Lake Baikal in Siberia. Piotr grew up with his dear brother, the famous cosmonaut Mikhail Rasputin, and his beloved younger sister, Illyana Rasputina and would pass the time drawing or painting, a hobby he was immensely talented in. Piotr's superhuman powers emerged at the age of 13. At first, he was content simply to use these powers to aid his family and the other people of the Collective. After a transformed Piotr rescued his sister Illyana from a runaway tractor, he was contacted by Professor Charles Xavier, founder of the X-Men, when Professor Xavier was organising a new team of mutant X-Men to help him rescue the original X-Men from the sentient island of Krakoa. Piotr agreed to leave the farm community in which he had been born and raised to go to America with Professor Xavier and stay at his School for Gifted Youngsters. Professor Xavier gave Piotr the code name "Colossus" and Piotr aided Professor Xavier's other new recruits in their battle against Krakoa.

Credit: Marvel.fandom.com

1ST APPEARANCE
Volume 1 July 1975
2ND APPEARANCE
Volume 1 August 1975
APPEARANCE OF DEATH
Volume 1 March 1986