Jack is one of the creepypastas with multiple variations of his origin. From what I heard he was a college student trying to be a doctor, thus the scalpel and knowledge of where kidneys are. He was kidnapped by a cult and sacrificed to a demon. The sacrifice was truly horrible as they took out his eyes and filled them with tar. The demon took over and Jack became a cannibal.
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My creepypasta art book
RandomI will have another one of these for anime drawings, but this one is for my creepypasta drawings.