Reason

Reason (理 (ことわり), Kotowari) is a term that refers to the will of the world. It is the consciousness of reality itself, acting in effort to give rise to all things in the world but to also maintain the balance of the world itself. As such, it is both a force of action and a force of response, which are often referred to as yin and yang. Reason is known to manifest in the form of physical incarnations, exalted as, while living beings who manage to break free of Reason and stand outside of it are known as.

Overview
were once referred to as "Balancers" (調整者 (バランサー), Baransā; Japanese for "Regulators"), denoting their role as agents of Reason that serve to maintain balance in the world in its stead.

Behind the Scenes
Although an idea introduced by Kubo through indirect mentions, the author has chosen to interpret the concept of Reason as something akin to that of Brahman from Hindu mythology. Similarly, the concept of Reason can be likened to that of the Counter Force from the multimedia franchise, Fate/Stay Night.