A few general notes, applicable regardless of AU:

- fairly emotionless, with a side of snark; ironically a very good actor so not a stranger to faking emotions to manipulate someone 

- original hair color is an ashy, dark brown

- halo is very faint if not completely invisible most of the time; usually shows up in a striking red color while committing something particularly heinous

- when particularly excited or mad, his eyes gain a red circle around the pupil, increasing in vibrancy based on the intensity of the emotion

- wings are usually white but depending on his actions, they may start to turn black, starting at the base then spreading towards the extremities; if starting to darken, he may or may not bleach them