Aura is an ability that all those with a soul can use, at least with enough practice. A person with a strong Aura may radiate bright colors when using it. Because Aura is the manifestation of the soul, it can appear very differently depending on who is using it. For example, the color of Aura differs from person to person.
It appears that Aura is able to manifest in different ways when in use and takes on the color of one's inner energy. It appears as a slight glow around the body.
It has been stated that the activation of an Aura requires training and willpower, though someone with considerable training can unlock the Aura of another person.