Don’t forget the “reality warpers,” like Mad Jim Jaspers, Proteus, and the Marquis of Death, where some random baby can just, by pure chance, be born a neigh-omnipotent god-being that can overpower the cosmic embodiment of time or some shit just by thinking about it.

I meant to include something like that in the 11 category, Legion and Franklin Richards would also fall into that list although Franklin isn't a mutant anymore because Dan Slott decided so.

Instead I was going to name Matthew Malloy since he only comes into his powers during adulthood due to Xavier putting various mindwhammies on him prior to that. His powers awaken and he causes the equivalent of a nuclear explosion turning the local area into a crater. When SHIELD ends up trying to kill him, and does kill Cyclops and Magik in the attempt, Matthew survives, reconstitutes himself, takes out the SHIELD helicarrier, then ends up accidentally killing Emma Frost and some others when he visits the X-Mansion after.

Prior to all this Maria Hill talks about how Nick Fury only ever had 1 "worst case scenario" which was "Man wakes up with the power of God", which is precisely what happens with Matthew.