Izuku's quirk is Potionbrewer. It's an Emitter type that allows Izuku access to forgotten knowledge and wisdom. Not all forgotten knowledge, but forgotten items and how to make them, where legendary treasures and items lay. Knowledge of forgotten places and their whereabouts. One for All and All for One is known to Izuku, as they were forgotten to time, and is relative to Izuku's future. No matter what, when he is 14 he will be throughly caught up in the battle between the two.
Izuku knows how to make Potions. Healing Potions, Regrow Potions, Stamina Potions, and any other potions you want or need! He knows the whereabouts of Atlantis and legendary weapons made eons ago. He knows of where objects of power lost to time lie. If its mysterious Izuku usually knows of it or how to make it.
Of course Izuku officially named it Potionbrewer, and has only put down that he can make Potions. He's hidden that he knows this stuff to protect himself and his mother from unsavory individuals.

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MHA Story And Quirk Ideas
FantasyStory/Plot and Quirk Ideas I have no motivation to make, but think sound really cool! The entries with Quirk : [Name Here] means this entry is about a quirk idea! The entries with Story: [Name Here] means it's a story idea! If they're combined, it m...