Source: nerdist.com
7. Iceman
Omega Level Mutant
I know. I'M SURPRISED, TOO. But Bobby Drake is a canonical Omega Level Mutant.
Admittedly, Bobby is only one of the most powerful Mutants IN THEORY, as he hasn't yet cracked his full potential. He has gotten close, though. When Emma Frost took control of Bobby, she was able to unleash a massive amount of power. Psylocke was also able to get some serious ice powers going for him.
Alternate future versions of Iceman have also exhibited crazy abilities. The alternate future Bobby of Battle for the Atom was able to create sentient living beings out of ice, and his Ice Hulk became a member of the Brotherhood of Evil Mutants. Granting sentience to solid ice is a godlike ability, and our Bobby has come close, especially with his ability to create ice clones. In addition, Bobby is maybe my favorite X-Man, and is by far the best original team member. He's just a likable dude with cool powers, and some crazy power waiting for him to tap into it.
Power Level: This popsicle has potential.

