Izuku Yagi: The Ultimate Lifeform

Hisashi and Inko Midoriya were happily married. However, before either could find out that Inko was pregnant with twins, Hisashi was killed during a villain attack. Two years later, Inko remarried a man named Toshinori Yagi. On the day that the twins went to see what their Quirks were, Izuku was heartbroken to learn he was Quirkless. Despite this, his sister, their friends (1-A and 1-B), and everyone they knew still supported his goals to become a hero. Hell, during the kids' middle school years, Toshinori was considering giving his son OFA after seeing how he had the heart of a true hero.

Unfortunately, Izuku was kidnapped by the Shie Hassaikai on his way back home after school one day, where over the next three years, Overhaul experimented on him, turning him into the "ultimate lifeform". Izuku's memories of his loved ones helped him endure the pain, but Overhaul eventually had his mind wiped and renames him Shadow. What Overhaul never anticipated was Shadow turning against him and killing him and the Shie Hassaikai, taking a smol bean with him.

Shadow began taking care of Eri and brought in a new friend named Himiko, and became a vigilante. However, when Shadow learns that a group of villains are planning to attack and kill both UA students and All Might at the USJ, Shadow's memories begin to resurface when he goes to save them.

Can Shadow's forgotten loved ones help him remember who he is?