User blog comment:Maki Kuronami/Lesson 6: Aura and the Grim diversity/@comment-14843841-20130823011114/@comment-4773581-20130823013048

Better yet, think of Aura as Ki. It's a staple of the Martial Arts genre of manga and anime, and shares quite a lot in common with Aura.

A natural and somewhat supernatural body contained in one's own body; check. Enhancing one's perception; check. Increasing the force of one's blows; check. Making one tougher overall; check. Healing (minor) wounds; check. Creating an aura around its user when seriously used; check. Being defined as "life energy", or some variation thereof; "soul energy" counts, so check. Can be focused into or around an object to increase its usability as a weapon and/or durability; if the fang Ren used is anything to go by, check.

Now the only question is whether it can be gathered into balls and thrown/shot, like in the Dragon Ball series.