The aura selection is not random, While doing the quest, you receive each aura depending on your answers to the Officer.

There are 6 different auras. that you can choose depending on the procedure of the quest.
Fire
Aqua
Ice
Terra
Thunder
Wind

To get Ice aura, you should follow those steps:
-Will Balance Be captured in real world and Tranquility be restored?
-Will I be travelling, following inner signs, or the opposite side of the mirror?
-5
-Pride of level-headed rationality, Solide strength of a wall.

To get Aqua aura, you should follow those steps:
-Will Balance Be captured in real world and Tranquility be restored?
-Will I be traveling, following inner signs, or the opposite side of the mirror?
-8
-Conquest of opposition. Recovery Power that is repitative.

To get Terra aura, you should follow those steps:
-Will Balance Be captured in real world and Tranquility be restored?
-Will I be asking my current life's path to ensure a pursuit of the truth?
-6
-Balance between mind and body, Protective Power derived from Earth.

To get Wind aura, you should follow those steps:
-Will Balance Be captured in real world and Tranquility be restored?
-Will I be asking my current life's path to ensure a pursuit of the truth?
-7
-Praticall Knowledge. Reasoning Power that is deep and free of superfluity.

To get Fire aura, you have to follow those steps:
-Will I be fighting According to some Floating Illusion?
- Select B
-1
-Intuitive and Aggressive behavior. Power determination that can burn all in its path.

To get Thunder aura, you have to follow those steps:
-Will I be fighting According to some Floating Illusion?
- Select B
-4
-The fury of the skies, Chaotic power that shakes the atmosphere.

IN SHORT:

Legend: 1 (1st choice) 2 (2nd choice)