The White Eyed Twins

In this world, your eye color dictates your Powers. Green all the way up to Red.

But what if there's another eye color? White. White is the most powerful, and it just so happens Mabel and Dipper Pines were born with white eyes. Here's the story of them gaining their powers and learning to control them.

OR- Mabel and Dipper have magic, so does everybody else but they're more important cause protagonists.