Everything Izuku’s paints happens in real life.

Izuku in this scenario had a quirk that functioned like Banana Barbara from the amazing world of gumball, where he had the ability to paint and make things happen in the future.

He can paint landscapes, and in real time make it rain if he painted clouds, lightening, cause an earthquake, or anything since it always comes true in real time or not depending on his mood.

Izuku is a reality warper with a brush.