Finn

Finn was a black Stormtrooper. Finn was not a badass black man like Mace Windu or a cool smooth talking black man like Lando Calrissian. Finn was a pacifist who hated fighting so he ran away from the Stormtroopers... Except he really was not that apposed to violence because he and Poe Dameron shot up a hanger full of Stromtroopers that for all Finn knew felt the way he did.

Behind The Scenes
Fin defected from the Stormtroopers like how Leia defected from the Imperial Senate.