Headless Horseman (Scooby-Doo! and the Goblin King)

Physical appearance
The headless horseman wears a blue button shirt, blue pants, blue boots, blue gloves, black belt and a blue cape. He mostly rides an evil horse

Personality
He is an evil spirit, who likes to kill people and it appears, he can only laugh or grunt. Not at any point does he talk.

Powers and abilities
The headless horseman has a sword and an axe. He can also take command over Jack O' Lantern, so that Jack becomes he's head. He is also immortal

History
We first see the headless horseman, when Shaggy and Scooby exits the monster pub with Jack O' Lantern. When the three sees the headless horseman, they run into a pumpkin market and the headless horseman follows. The headless horseman afterwards destroys every pumpkin until he is near the three hiding as a pumpkin. They run again right before the headless horseman can get them. The headless horseman gets on his horse and follows them. They try to stop him by using cards giving to them by Mr. Giggles. Scooby falls behind and not short after Shaggy falls into a lake. Jack O' Lantern sees the headless horseman approaching him and he tries to hop away. But the headless horseman catches up to him and graps him by his root on top of his head. The headless horseman then proceeds to move Jack ontop of his headless body and then presses him onto his body. Jack can't escape and the headless horseman takes control of him, so that he becomes one with the headless horseman. the headlees horseman returns to finish of Shaggy, with his newly acquired head. The headless horseman tries to finish Shaggy off, but Scooby swoobs in and grabs Jack O' Lantern. The connection is severed and Jack returns to himself. The three then escapes the headless horseman by running over a covered bridge.

At the end of the movie we see the headless horseman appear in the magic mirror, but it turns out to be Scooby doo.