Here are some others.

Compassion--if this one isn't self-explanatory, please check your harp at the door on your way out. When one of our fallen brothers shows more thought to a mortal's safety and well-being than you, with no ulterior motive--well, bravo for him, first off, and second--what are you thinking?

Non-judgment--judging the worthiness of others is God's job. Not yours. If you want to know whether someone must be warned, ostracized or punished, as my daughter likes to say, "take the problem upstairs".

Patience--important one for dealing with humans, dears. And angels!

Courage--note. Courage is not bloodlust. Sometimes courage involves refraining from violence for the safety of others when someone else is threatening you or yours.

Loyalty--Loyalty is not a blind following of dogma, nor angelic leaders, nor one's own understanding of how best to appear loyal. Nor is it blind obeisance. No. I do not agree with everything in the way things work, nor with every decision He has ever made. Yet when Called on, I act. Nor do I agree with all my brethren--yet when they are in need, I will aid them.

Industry--Yes, yes, I know, my angelic beauty is getting a bit round and cuddly looking as I move toward a more earthbound existence.  That's fine--Gabriel has Terribly Pretty covered anyway. Nevertheless, I do my work, and so do those beneath me.

A Sense of Humor--If you don't think that this is necessary to deal with such grim tasks as ours, well...you must be an archangel consider trying it. It lightens the load a bit.

More as I think of them. I'm terribly pedantic.