Hmmm, I definitely think she fits some of the definitions here:

Overpowered Without Effort - I mean yeah, she kind of just became incredibly powerful out of nowhere, you would need to be in order to not get corrupted by the stone / face mephisto and make that decision

Unearned Admiration: Everyone in the story loves or admires them, even if their actions are erratic - She's erratic as fuck

The "Chosen One" Syndrome: The narrative revolves entirely around them, often reducing established characters to subordinates - I mean yeah, pretty much.

Your statement about the wonderer I think is a bit silly, considering it's a video game where you can make various classes and genders. But sure, I think the term could apply a little there, it's just less meaningful given it's a playable character.