Luna Lovegood

In All the Wrong Things by lovesbitca8 Luna tells Draco she can see peoples auras as colors when she's being held prisoner in Malfoy Manor. His aura used to be green when they were at Hogwarts but has since changed to a dark blue. The Death Eaters in Manor have "no colors" she says. He asks what color she is and she says she doesn't know - she can't see herself. He responds as he's leaving that day that "she's all the colors" I haven't been able to stop thinking about that in association with Luna now and this is close to what I envision as Luna's Aura.