Though Omega-level mutants are universally considered to be the strongest and most powerful in all of mutantkind, there are still plenty of X-Men characters who aren't considered Omega-level, but ...

But it wasn’t until 2001 that the term took more concrete form, labeling Iceman (Bobby Drake) and Jean Grey as Omega-level in X-Men Forever #3. Through 2012’s Avengers Vs.