Rogue and an out-of-control Mimic, more closely. both power/knowledge sappers, and mimic's powers once flared out of control so that he sucked the life energy out of people.
there was a character called Spike in X-Statix [powers akin to Spyke from Evo,] as well as numerous male bone/quill characters, such as Absalom, all of the Quills, etc.
Husk can turn into metal using her power, though it's not the same method as Colossus. Mercury is made of metal, though her body works much differently than Piotr's.