The Beholder

The Observer (観察者) is Fushi's creator and the narrator of To Your Eternity.

Appearance
The Observer wears a long, black cloak with a hood that covers his face.

Background
Not much is known about this mysterious being, but it has been revealed that he created Fushi in order to collect information and protect the world. The Observer also revealed that he is not immortal and will one day die.

Abilities
The Observer has the ability to sense the Knockers and knows where they are (except for when they are underground). He compares it to the feeling of bugs crawling on your skin. "As eggs, you cannot notice them, but once they hatch, you are subject to great unease." The Observer is also strong enough to control Fushi, as seen in chapter 32 when he forces Fushi to transform from the boys form into a wolf. Although he can control Fushi's body, he cannot control his mind.
 * Detecting the Knockers
 * Controlling Fushi