Jack Skellington is the patron spirit of Halloween, portrayed as being on par with Santa Claus and the Easter Bunny within his own holiday. As a living skeleton, he is immortal and can remove parts of his body without harm, as is often demonstrated for comic relief. He is the most important of many Halloween spirits, with the implication that their job is to scare people in the real world on Halloween night, though all in innocent fun.
Jack Skellington appears as a part of the starting roster of the game Disney vs. Fantendo: A Collision of Worlds! His role in the game's storyline is currently unknown at the moment.