Board Thread:General Discussion/@comment-109.153.113.100-20171222023332/@comment-4010415-20171222033732

But blue and red make purple, not pink.

Ren's Aura is pink, but his Semblance simply conceals negative emotions.

Pyrrha's Aura was red, and her Semblance was polarity, which doesn't really seem to be a "body augmentation" type of thing.

Yang's Semblance has her take damage to build up energy that she can use to augment the strength of her attacks, and her Aura is yellow.

Sun's Aura is also yellow like Yang's, but his Semblance allows him to create and control clones of himself.

I think a lot of characters' Aura colors have more to do with what colors their names point to, though even then, it seems that isn't always the case. Jaune's name points to yellow, but his Aura is white. Though, you could say his last name Arc can point to the French "arc-en-ciel" which means rainbow, and a rainbow is made by splitting white light. But then there's Glynda, whose name points to white, yet her Aura appears to be purple. Then, there's also Mercury Black, whose Aura is white, as well as Qrow Branwen, whose name points to black and white yet he has red Aura.