MHA Ben 10

During the first era of quirks, there was a hero named Ben 10 whose quirk called the Omnitrix was the greatest hero. But after his passing, the omnitrix quirk was lost until your 4th birthday, You've inherited the omnitrix quirk. After 12 years, you've fully mastered every alien, unlocked their ultimate form, and master control. when you were 10, you've found Overhaul and defeated him and his group, and took care of baby Eri and raised her. You are apart of the plumbers, which is the intergalactic police force that dealt with aliens.