Eyeless Jack

Eyeless Jack is the main antagonist of the Creepypasta of the same name. He is not given any origin, and while fans have written many of their own, there is no confirmed origin of Eyeless Jack.

Story
In the original story, a man named Mitch moves in with his brother Edwin after his house is foreclosed. A week later, Mitch wakes up with a large gash on his cheek. After going to the hospital, the doctor reveals that Mitch's left kidney had been surgically removed overnight.

Around midnight that night, Mitch wakes to see Eyeless Jack over his bed, wearing a blue mask with black liquid dripping from empty eye sockets behind the mask. Mitch manages to grab his camera and take a picture before Jack attacks, clawing at his chest. Mitch escapes and flees into the woods, where he trips and is knocked unconscious.

When Mitch awakens in the hospital, it is revealed to him that Edwin had been killed the previous night. His parents drive him to the house to collect his belongings. When he enters, Mitch sees Edwin's corpse and a small object laying next to it. He observes it to find that it is his kidney with a bite taken out of it, covered in a black substance.

Appearance
He is a typical serial killer like Jeff the Killer or Ticci-Toby, but his goals, origins, motives, age, nationality, true name, black blood, and supposed ability to see and stay alive with presumably no eyes are never explained.

Eyeless Jack is usually described as a person in a black hoodie and a expressionless blue mask with no nose or mouth. Black liquid, supposedly blood, is dripping from the eye sockets behind the mask.

Eyeless Jack is infamous for being able to successfully remove a victim's kidney while they are asleep and sew up the wound flawlessly, so it is apparent that he has anatomical and perhaps even medical knowledge. He also possesses tremendous stealth and is almost never caught in the act.

Trivia

 * With the villain being so shrouded in mystery, it's gender is truly unknown. And doesn't even have to be male (Which it's name suggests it to be)
 * Eyeless Jack is considered one of the most popular mainstream Creepypasta characters including Jeff the Killer, Laughing Jack and Slenderman.