The Soul Robber is a rubbery green creature that Dr. Finkelstein created. When Jack came to the doctor for advice on making a new, more exciting Halloween, Finkelstein gave him the Soul Robber, which immediately latched onto Jack's wrist and demonstrated its shapeshifting by snatching a nearby Jack-O-Lantern. When the gameplay begins, the Soul Robber is Jack's only method of combating Oogie's monsters.
Nothing is known about the Soul Robber's personality, except that it seems to like Jack.
When monsters are close by, the Soul Robber trails around Jack's hand like a rope or ribbon. When Jack lashes out, it can strike enemies in the form of a rope-dart, a scythe, or a mace. Lashing it out at nearby collectibles will add them to the inventory, and it can also grab opponents or noncollectible items and slam them into the ground or throw them. If Jack spins around the Soul Robber to charge up its energy before grabbing something, Jack will spin it around instead, creating a tornado effect that damages anything nearby.
However, grabbing something consumes the Soul Robber's energy: the longer it holds onto a monster or item, the more its color will fade from green to red, and when it becomes fully red, it lets go of what it was holding onto and retracts. The heavier the object, the faster the energy detracts. Consuming a Blue Soul causes the Soul Robber to turn blue for a short period of time, augmenting its strength and giving it bottomless energy while the effects last.
Jack says the little creature's name whenever he grabs something.
- The Soul Robber is also considered as a character, as well as a weapon that takes a liking to Jack.