Looks like we won’t be seeing Colossus in Human form in his appearance in the ‘Deadpool’ movie.
As seen in previous X-Men films, Colossus has the mutant ability to change his skin into metal which results to giving him superhuman strength and impenetrable skin. The Marvel character has been seen transitioning between his human form and metal armor in “X-Men 2”, “X-Men: The Last Stand” and “X-Men: Days of Future Past” as portrayed by Daniel Cudmore.
The Colossus name also suggests that he resembles a statue that’s bigger than a normal human being. What better way to make it more intimidating but by having a body of strong build and being able to coat the skin with steel.
True to that intimidation, Colossus in the movie will remain in his metal form for the whole duration of his part. Greg Lasalle, the face of Colossus, spoke with Cinema Blend: “Well actually, this film he’s only in his metal form. I don’t know if you knew that. So you won’t see a human form of Colossus in Deadpool, only the CG version.”
This entails that the metallic giant in his human form will not be present. Lasalle also made mention that keeping the character in his metal form is actually less difficult for the filmmakers. This way, they let motion capture performance actors Andre Tricoteux and Stefan Kapicic act the part then worry about the emotions later. Aside from Kapicic’s body build, he is also employed as the voice of the comic book character due to his Serbian accent as what was reported in an interview with Entertainment Weekly.
His hesitation to revert to the frail human form is perhaps with good reason. Being with Deadpool, the titular character portrayed by Ryan Reynolds and is known to be a loose cannon, it’s best to keep your defense up all the time. Another reason to stay in metal form protected is Negasonic Teenage Warhead, played by Brianna Hildebrand and the X-men girl capable of exploding at whim who is always seen by Colossus’ side.