Bobby Drake aka Iceman

Yep that kid who can freeze things and really help you out when you need cold beer is actually an Omega level mutant. The thing is, Bobby is not aware of his potential, and his true ability remained unknown for a very long time. His merits were revealed once Emma Frost possessed him and tapped into the very core of his mutant ability. While Emma was inside Iceman she was able to control moisture, which is significantly better than simply creating ice.

She could freeze liquids inside other people’s body, assume either liquid, solid or gaseous form, which means Iceman can control anything that contains liquid or moisture.  Additionally, Bobby discovered that he can create ice sculptures with a mind of their own, which pretty much classifies him as omega level godlike mutant.