Henry

"'It's only now that I understand the depth of the depravity of this... creature, this monster that I unwillingly helped to create.'-Cassette Man, Pizzeria Simulator"Henry was the original creator of Fredbear's Family Diner and a co-owner of Freddy Fazbear's Pizza. He was first introduced in the Silver Eyes novel and is theorized to be the Desk Man from FNaF World and the Cassette Man from Pizzeria Simulator/FNaF 6.

Role in the Silver Eyes
Henry is introduced as Charlie's father. Little is known about him other than he used to be William Afton 's partner and is the original creator of Fredbear's Family Diner. He supposedly committed suicide however it's unknown if he really is dead or not.

Role in FNaF World
There's a character in FNaF World known as the "Desk Man". He was assumed to be non other than Henry due to one ending where he says he "created something terrible" and says "her name is Baby" and then dies. Many people compared this to his suicide in the Silver Eyes novel.

Role in Pizzeria Simulator
There's a character named the "Cassette Man" in which guides the player throughout the game. He was soon later to be revealed as Henry as he knows who Circus Baby is and says to William Afton/Springtrap:"'As for one of you, the darkest pits of hell has been opened, so I suggest not to keep the devil waiting, 'Old Friend.'"He also seems to refer to William Afton as a "monster that he helped to create". It is unknown what he exactly means by it.