Ha trick question, the true answer is to approach the question like a dialogue. If the MC influences the world, then the world should influence them and vice versa. This is also missing the more important/impactful conflict of characters influencing the MC, and them influencing other characters...
I would be a civilian. My quirk would be a portable subspace that bends to my whims. Free housing and amenities including electricity, plumbing, and internet. What else would you want?