Aura

Description/Properties
Aura is a concept that appears often within canon.

Aura Color
When an Aura is activated, its light is visibly generated from a body, and has a distinct colour. Almost every aura colour is different, though a number of them are the same colour; however, none of them are the same colour, scent, and type, making every aura unique.

Aura Scent
When an Aura is activated, and its presence is released from a body, a scent is released along with it. This scent is preset as an associated scent connected to the person and their aura, and it is usually something that is the same colour as their aura. However, most aura scents can be changed at will with a magical procedure. The procedure is not permanent, and aura scent can be changed at any time. "Pure colours" and "pure greys" cannot change their aura scent.