Fushi's creator and the narrator of Fumetsu no Anata e.

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 Beholder also revealed that he is not immortal and will one day die. The Beholder has light colored skin and wears a long, black cloak with a hood. He also doesn't appear to have hair.

He has the ability to sense the Knockers and know where they are (except for when they are underground). He compares it to the feeling of bugs crawling on your skin. He 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.

Although Fushi is normally the only one that can see and communicate with him, The Beholder seems to be able to show himself/talk to other people as well. This can be seen in chapter 54 when Pioran asks The Beholder to take her and, if possible, let her be reborn into something that can help Fushi.

(Source: Fumetsu no Anata e Fandom Wiki)