Aaron L. Goosby/Roku

Roku is a Thought Projection and one of the Seven Concubines (Romaji: Shichisokushitsu, Kanji: 七側室).

She is representative of Aaron's apathy and sadness and as a result she serves as his spokeswoman whenever he is in such a mood.

Personality
Contrary to popular belief, the Seven Concubines aren't just manifestations of Aaron's personality. They're also individuals in their own right and as a result of such each of them have a personality of their own.

Whenever she isn't serving as Aaron's spokeswoman, Roku is working in a diligent manner. For Roku is major workaholic. Through and through. If she isn't doing something for Aaron, than she is doing something for someone else. And if nobody has anything for her to do, she'll find something to do even if she has to cause the problem herself!

Aaron L. Goosby
Roku finds Aaron to be annoying at best and completely intolerable at worst. She finds his tendency to place his pride of reason to be a downright embarrassing trait for an adult to have and as a result she is always trying to break Aaron out of the habit.

She even goes so far as to mouth off about Aaron's secrets at times. Something which gets her into major trouble every time she does it.

Archive
Roku is a capable caster of Archive (Romaji: Ākaibu, Kanju: 古文書). Under normal circumstances, she utilizes it as a means of coordinating Aaron and the other six of the Seven Concubines. However, it should also be noted that she can utilize it to both collect data on any magic that is being used before her and access any of the data she has collected.

Such data, which she can quickly transfer to Aaron and any of the other six of the Seven Concubines, is irreplaceably useful when it comes to efficiently applying Annihilation Magic in combat.