Mad Dummy (Undertale Film)

Mad Dummy is a character in the Undertale 2025 film. He is a ghost monster living inside a dummy located in the Garbage Dump. He wants to kill Frisk to avenge his cousin back in the Ruins.

Appearance
Mad Dummy takes the appearance of a dummy with a set of upper teeth on the torso, a set of eyes on the head, and nostrils on the nose.

Personality
Mad Dummy has an aloof attitude when making conclusive presumptions, which is notable when any action Frisk does to the dummy is considered unfathomable. He also despises the feeling of powerlessness, feeling disarmed when his dummies cannot kill Frisk quickly. He also acts unhinged at exciting points of an event, often repeating three times what he says in a crescendo and uttering maniacal laughter, such as against Frisk to entice an outward fear of hopelessness and boast his invincibility.

Abilities
Mad Dummy, being a ghost, is immune to physical attacks, and can only be hurt by magic attacks. He can also summon small versions of himself, both in typical dummy and robot form.

Differences from Game Character

 * Mad Dummy in the game has an ambiguous gender. However, in the film, he is voiced by, and described in certain promotional material as male.