1 Deku's infinity quirk

As we know originaly from the cannon, Izuku gets his quirk from All Might, but not in this story. When kids hit their fourth birthday, they develop quirks. The supposed "deadline" is around three months after their birthday. See, the more powerful the quirk, the longer it takes to manifest. All Might's quirk set the deadline, do to how powerful his quirk is. But this just goes to show how much more power Izuku's quirk has and is. (I'll try to stop saying power/powerfull).

The Infinity Quirk-

Gives him the power to create quirks. Once a quirk is created, it stays within him forever. The drawbacks are none, exept the fact he has to train using the original quirk, not the created. Basically, he has to practice creating quirks, and once he gets the hang of it, he's, I guess you could say indestructible, or immortal. He does not get tired from using or creating quirks. Once he creates a quirk, he immediately knows the basics on how to use it. However, if he looks up information to benifit the quirk, he can also use that. He can also stay in an animal like hybrid creature, so he could walk aroud with wolf ears and a tail, his favorite is a cat, bunny or a fox.

My All Mighty Changes For All Might-

All Might was not born quirkless in this story, so his quirk came as a natural and rare mutation, since neither of his parents had a quirk like this. Having said that, he cannot pass on his quirk, like he did with Izuku in the cannon.