Viola Vincent

Viola helps her brother help mythical creatures. She drives the car.

They are siblings who travel across the world, selling useless products and helping mythical and supernatural beasts and people. 

They are both half demon, and the freckles that Vance has are remnants of souls that are left behind from a person. So the more people he's around, the more freckles. The freckles clump together and spread like groups of people, too.

 Viola's covered eye is completely black. 

 If they create magic, Vance's is a pinkish, and Viola's is blue.

 they have both been shot before by angry people