Jeff the Killer (also known as Jeffrey Woods) is one of the younger children of Slenderman and Anakin Skywalker. Like his siblings, he can and will eat humans if given half a chance.
Due to his insanity, he severely burned his eyelids and cut his cheeks to make it look like he's always smiling, and he regrets nothing. Due to being a son of Slendy and Anakin, he can use the force and he has the same tendrils that Slenderman does (same color, too).