Throughout the story of My Hero Academia, Izuku Midoriya (aka Deku) underwent a variety of changes, most of them for the better. When he gained the One For All Quirk, he became All Might's worthy successor and gained the power to fight villainy. Deku kept glowing up with new abilities, strategies, and friendships. Then his darkest transformation took place, and fans want to know exactly why Deku went down the path of dangerous vigilantism.
Source：https://www.cbr.com/my-hero-academia-why-izuku-midoriya-deku-became-dark-deku/
