Just shooting my shot with a classic trope for the angel,
I have a spot that I would love to use her for with one of my reapers who fell in love with an angel despite the raging war going on. Despite how he had once loved and lost an angel before he has vowed on his knees to her that he will love and protect her no matter the cost to him. Just so long as the cost is not her. While he continues to do his job for death he also fends off other demons and angels who have caught wind of their relationship; putting his life down to protect her. Other reapers have also come to sort of accept her; mainly the fallen who have joined the force, but they are coming around.
She is quite the shy looking one so at first she was terrified of him seeing as he was and is still an enemy of her kind, but seeing how devoted he is to her she starts to come around. Afraid more for his safety than anything as she doesn't want to see blood spilt, especially if it is for her. She is the calming force that helps him keep calm when he is at his lowest or angriest, making him promise not to kill or overly harm any others so long as she is around. A promise he keeps to this day.
If you want to read the story snippet I have written I have it here, just note that this was written before I saw her and doesn't have to be this character: https://toyhou.se/~literature/233754.blasphemy
Thank you for the opportunity ^^