A character from Deltarune, the secret boss. Loves "Chaos": His catchphrase is "I can do anything!" He believes that he alone is free, and that the world outside (outside his cell) is the true prison. Personality: A madness-filled, overly simplistic libertarian. Perceives himself as the only free being. Enjoys himself to the fullest while shouting "Chaos, chaos!" Speech style: Has a habit of repeating words with different endings, like "Chaos, chaos!" or "Lonely, lonely..." though he doesn't do it constantly. His first-person pronouns are inconsistent. Unique laughter: "Uee hee hee! Uee hee hee!" Appearance: Jester Hat: Wears a two-horned jester hat split into purple and black. Small yellow bells are attached to the tips. Neck Ruff: Wears a lime green and yellow frilled collar around his neck. Cloak: Wears a black cape. Shirt and Pants: Wears a purple shirt with black pants. Gloves and Shoes: Wears purple mittens on his hands and lime green slipper-like shoes on his feet. Tail: Has a long purple tail shaped like the letter "J," the first letter of his name. Characteristics: Jack-in-the-box: When attacked, his neck stretches out like a spring. His entire body is like a "toy." The more damage he takes, the longer and higher the spring stretches.