Colossus - Nicolaevich Rasputin
There isn't much in the terms of an origin story for this massive hero, he had small parts here and there, in terms of boring he was living on a farm with his family, his siblings were also mutants and Colssus's body was made of steel with been recruited by the X-men.
The character is trying to make a come back we see him been added to the big screen featuring in the Deadpool movie, there is little to offer for this character, but with the right vision and story arc, this can be one of the next best hero stories.