Jester’s a vintage typical court harlequinade. He's 1'8" and weighs one and a half pounds. In Puppet Master III: Toulon's Revenge it is revealed that before he became a puppet, Jester was a man named Hans Seiderman; a bookkeeper who loved to play pranks and tell jokes who was killed by the Nazis when his jokes went too far.
He was used for evil under puppet masters Neil Gallagher, André Toulon (Puppet Master II), and Dr. Magrew, all whom he turned against in the end. Jester has the ability to rotate three portions of his face: his forehead, middle face, and chin. He can show five expressions: happy, devious, sad, angry or surprised, which also doubles as scared. He holds a scepter which can sometimes be used as a weapon. However, Jester is only seen with his scepter in Puppet Master vs. Demonic Toys.
Out of all the puppets, Jester has the most designs. In Puppet Master 1-5, Jester has red clothes, his sleeves are mixed in purple and black, in Part 1 and the beginning of Part 2 he doesn't wear a hat, except in a scene where he is behind a curtain, while every movie since he has worn a jester hat, the rest of Part 2, and 3-5, he had a purple hat. In Puppet Master 6-8, Jester is all red, mixed on his sleeves are red and blue, and he has a blue hat. In Puppet Master vs. Demonic Toys, Jester is all orange. He was given a mace-arm by Robert Toulon after a terrible fire in Puppet Master vs. Demonic Toys. In Puppet Master, the puppets turned on their master because he threw Jester, and in part II, the puppets tried to find the formula for the starving puppet. In Puppet Master 1–5, Jester Serves as the watchman of the group; looking out for danger and keeping the enemy occupied long enough for the puppets to strike. Jester's most common companion is Pinhead in films III-V, and Blade in Curse of the Puppet Master and Puppet Master vs. Demonic Toys. Jester also spends time with Leech Woman. He is cared for by the other puppets. Jester can fit through small places where the other puppets can't. He is also sometimes credited as the leader of the puppets, but he lets Blade act as leader.