This one's different from what I've seen previously. Instead of getting a Miraculous in one way or another. Izuku is born with an immense amount of Innate Magic (Not a Quirk). And when he reaches certain milestones in life a new Kwami is crafted.

Why not have Nooroo abandoned the Box and find Izuku? Switch her to a Ring for example and leave Gabriel unstable cause without her, he cannot use his power without mental instability. Prompt from SethTDW.

What if Master Fu saw something more in his short observations of Adrien and Marinette before giving them the Miraculous of the Ladybug and Black Cat? What if this slight observation was enough to alter a single event that reshaped the future?

Izuku was born with a Quirk so powerful it couldn't be detected, but so simplistic that anyone with a Quirk Identification Quirk would miss it. He could create any one thing he wants. As long as it wasn't a Quirk.

Harry Potter is not a normal boy, with a normal life, he has no secrets. Or that's what everybody thinks. See Harry is a genius, and secretly takes every course at Hogwarts. Learning and studying everything he can. And now that the Triwizard Tournament has arrived? It's time he showed everyone the real Harry.