Just finished reading the My Hero Acadamia fanfiction "Just Deserts" by Elbowsnapper on RoyalRoad. The story follows an overpowered protagonist in his struggles with interpersonal relationships and vigilantism. It's good! I recommend it!
I don't HIGHLY recommend it though. I was disappointed in how poorly I felt it explored the theme of living in a society (bottom text) where using one's natural capacities for defense is forbidden without a license.