I was hoping that maybe 'ethereal appearance' could be a trait gained from the brilliant pampas quest, for Ilma? Mainly I think it would refer to the dream-state they were all in.
It wouldn't really do much except give the viewer a bit that ethereal/delicate/angel-like feeling when they look at her and maybe a really soft, almost-unnoticeable glow. She'd appear to others as if they might be dreaming her?
So the trait 'glowing' would be too much glow and lack that feeling. A halo feels too 'obvious' for her, to me ^^