Soulmates.

Who are you?

Dustin walked down the school halls, ignoring the numbers that flew past him.
He was born with a special gift - he could see how dangerous people were. A normal high schooler was normally a 1, the kids who got into fights were 2's. A military official trained with an assault rifle would be a 7.
In a world that was black and white, few found colour. A commonly known phenomenon in Dustin's world was the fact that everyone saw in black and white until they met their "soul mate". Dustin snorted at the idea. Stupid. He didn't want to fall in love with anyone.
He walked into his English class, wanting to discuss his project with the teacher. Sitting in the corner, reading, was a boy he didn't recognize.
He was pale, with jet black hair and grayish eyes, and a black hoodie and jeans. He wasn't particularly noticeable, except for one thing.

The bright white 10 above his head.