Jeff the Killer uses his original creepypasta. Although, there are some few changes in his original form.
Jeff the Killer wears a white jacket covered in blood, with a black shirt worn underneath. Jeff's face seems to be his original face that can be found in the creeypasta, but his face have a few changes. His mouth seems to be missing some teeth. Blood is visible on his face, dripping down his eyes. Jeff also has a long hair.
Jeff The Killer's behaviour is unknown. In the creeypasta, it is said that he is a malevolent and murderous entity.
Jeff The Killer's start location is unknown but he possibly starts in Pirate Caverns.