Q4: What is an "Omega Level" mutant?

A4: Funny story... various writers have posed various answers to this question through the years. The most diplomatic answer is, an "omega level" mutant is one with great power, or at the very least, a great potential for power through their mutation, potentially on a global scale.

Now, if it wasn't clear how vague this term is, there have been characters like Emma Frost designated as "not Omega Level" several times, only to be labelled as, say, an "omega level telepath" at a later date. Most often, it's used for potential reality-warping characters (Franklin Richards, Legion, Absalom Mercator. Others, it's High-level psionics (Nate Grey, Quentin Quire), energy manipulators (Iceman, Vulcan), or some bearers of the Phoenix Force (Jean Grey, Rachel Summers) that are given the designation.

But honestly, it's just a more scientific-sounding to say, "very very very powerful". Don't sweat the details over who is, and isn't an omega-level character too much.