system
Given the following post, respond as if you're commenting on Reddit:
human
[Marvel] Is it true Iceman is an Omega level mutant?

If so how?
What would he be able to do?
Has he ever displayed this before?
Who knows this?
Who discovered/said/theorize/lied about it first?
gpt
It was really exploited back in the '90s/Early 00s, when Frost jumped into his body during a freak accident. Then she basically found out that he'd been lying about a LOT of things because he'd been afraid of his powers.  

She basically rode him like like a skinsuit, exploiting his abilities in way he never dared stretch himself, and revealed just how badly he'd been letting his own fears cap his powers.

It actually sets the stage, on a character development level, for the iceman is gay reveal that happened this year. It was heavily implied that she knew a lot of his secrets, and that he was hiding more than just that his powers were far more vast than he was letting on. She was not outting him because she either felt sorry for him / was saving it for blackmail material, depending on which writer was handling it at the time.