No shame in liking what you like, OP. I'll bite.
Deadshot - Black and Red. Black reflects his calling as a hitman and his desire for death. Red is his rage toward his mother, his son's death, and the way he tortured his son's killer with a number of nonlethal shots before putting the adult-child out of his misery.
El Diablo - Red and White. Red because, hey, he's got pyrokinesis and rage issues toward people that laugh at his offers of redemption. White because he was altrusitic enough to turn himself into the authorities after he torched a gang's hideout and found out that there were women and children inside.
I totally agree on deadshot, though some of his incarnations do seem to have sort of a green vibe for reasons i cant put my finger on? or i might be just wrong. Didn't know that about El Diablo, that's very interesting.
What would you peg Dr. Strange?