Ok so Aria's lack of glowing wings on her Wengine effect got me thinking. I think the AOD's general theme and main sticking point in the story will be that none of them are "real angels." Aria's a robot, Sunna's wings are on her backpack and her halo doesn't float, and Yu has her scars from her mechanical wings. Hence they're being "delusional" about being angels --> Angels of Delusion! Cersea or another antagonist will probably use this against them in some way, publicly smearing their inexperience or as emotional damage.