Puppeteer

"The one who pulls the strings and the one who was corrupted most by Nightmare."

Puppeteer's description from the extras.

"Puppeteer is an empty vessel meaning that he can get anywhere he needs to be. Use all of your knowledge from Nights 1 - 4 to deal with him."

Puppeteer's Guide from the manual in the extras.

Puppeteer is the main character in Dermatos and is part of the reason as to why you cannot leave along with Nightmare.

Story
Puppeteer is the one who is beyond all. He was originally was a puppet inside a box however began to create horrific amalgamates. After the Fazbear's Fright fire he was trapped inside of the building and was corrupted beyond redemption by Nightmare. This caused him to create everyone except The Molten's {With the exception of Golden Molten who is not a molten}.

Appearance
Puppeteer is similar to the Nightmarionne. Both of them have black stripes streaming right down from their eyes to face. Puppeteer also has a grayish white face. He has no eyes, two red cheeks and he wears a black bowtie.

Behavior
Puppeteer like with Nightmare uses everyone from Night 1 - 4's mechanics. Puppeteer can come from the doors, vents, cameras and Pirate's Cove. The same way that you dealt with everyone else using these mechanics will work on the Puppeteer. He also can send Spyware phone calls like Golden Molten, they can be dealt with the same way as how you deal with Golden Molten when he does them. After you enter the number, Nightmare will come through the left door and can be beaten the same way as Molten Fazbear when he does that. Failure to deal with Puppeteer will cause him to restart your game after his jumpscare.

Nights
Puppeteer is active on Night 5 - 15. He is also active and replaces everyone along with Nightmare at 4:00 AM on Night 6.