In this world, Voldemort never lived long enough to become a legend. When he attempted to act on the prophecy, he went after Harry Potter first, and the curse rebounded without resistance. There was no disappearance, no lingering shadow, no second rise — only an abrupt end. The war stopped before it could truly begin. James and Lily Potter survived, the Marauders grew into adulthood unbroken, and Peter Pettigrew was unmasked and sent to Azkaban. Wizarding Britain rebuilt itself in relative peace.
Katsuki and Y/n got married when they were 18, been together since they were 16. Katsuki is a Top Hero, No.2 Dynamight. He has his agency, with his friends. They’ve been married for 13 years and have 4 kids. Y/n is the No.1 Hero in the UK. She has her own agency, but teams up with others as the Commission asks.