Yeah, I feel like Nate is just overhyped, spinning out of AoA. The fact that you can ignore his solo and he barely registers on the grand scheme of things shows you he's not all that(I'm sure some hardcore Nate fans could school us, but still, he doesn't have that powerlevel anymore after Sugar Man drained his powers or whatever in the Utopia era).
Colossus is technically organic osmium, the most dense naturally occurring element, rivaling diamond in hardness. Using real science, he would have a definitive melting point of 3306 K (3033 °C, 5491 °F) and boiling point of 5285 K (5012 °C, 9054 °F), the fourth highest of all known real substances(behind only carbon, tungsten and rhenium). His limit was reached in the comics when Pyro super heated him and then Avalanche busted liquid nitrogen on him.
Rogue had to steal his powers to revert him to flesh and the Morlock Healer had to fix him instantly to save him from that one. After the Mutant Massacre he was also severely damaged by Riptide's shurikens that Magneto had to fix the molecular damage, which left him paralyzed until the Fall of the Mutants(but he was stronger than before).
And yass, that cosplayer is working that mane!