|Marvel Universe Colossus Action Figure|
To the uninitiated, this is Piotr "Peter" Nikolaievitch Rasputin, AKA Colossus. Colossus has the mutant ability to transform his entire body - not just his skin - into an Osmium-like organic steel. In the process he gains significant mass, growing from 6'6" in height to around 7'5" in height, and weighs t least double his normal weight.
With the armor comes an extremely high resistance to injury and superhuman strength and stamina - supposedly Colossus is in the Class 100 strength level following the realignment of his cells by Magneto due to an injury sustained during the Mutant Massacre. While armored, Colossus requires no food, water or oxygen and is naturally resistant to other forms of energy attacks including temperature extremes, electricity and even magic.
At one time, while in armored form, he was able to kiss Rogue.
Which Marvel constantly forgets.