John is a tall machine with a Painter's Brush mustache. He wears a black top hat and a black tuxedo. His mouth is in the shape of an upside-down U from the bottom of his face to just above his mustache, and he has black circles for eyes.
John was built along with many other machines for the Granbell Kingdom back when it had many visitors. After the park was abandoned a century ago, he and the rest of the machines were left to fend for themselves. About ten years before all the Granbell machines ceased to function, when the Demon King discovered an orphaned boy named Shiki, John and the others looked after the boy who in turn looked after their repairs. When the Demon King's body broke down and he ceased to function, he left Shiki to be looked after by John and the other Granbell machines. And he requested that John and the other machines make Shiki leave them behind as he knew he would be all alone once their batteries died.
John is one of the three machines that Shiki introduces to Rebecca and Happy. After the introductions are finished, John, along with the others, throw a party to celebrate the first visitor in Granbell in 100 years. When Shiki falls asleep, John along with the other machines explain to Rebecca exactly why Shiki is living on Granbell before escorting her to bed. The next morning, John, along with the other machines, ties up Rebecca and attacks Shiki before Shiki attacks back to save Rebecca. John and the other machines then pursue Shiki, Rebecca, and Happy as they flee, but they manage to escape. Once they are gone, John and the other machines, who have only attacked Shiki as a ruse in order to make him leave before he ended up alone, express their happiness at him being able to leave before they all cease to function.