Laughing Jack

Laughing Jack is the titular antagonist of the Creepypasta story of the same name and its prequel, "The Origin of Laughing Jack".

History
Laughing Jack was created by the guardian angel of a lonely boy named Isaac Grossman who was beaten and tormented by his mother, in London, United Kingdom. Laughing Jack's colourful appearance turned monochrome and he became emotionless as a result of his imprisonment.

Jack became more evil as Isaac became a serial killer who would commit his murders in front of Laughing Jack's prison. Isaac rediscovered the box Jack was trapped in and accidentally released him. Resentful of his former friend and having a newfound love for violence, Jack brutally murdered Isaac and continued spreading his own brand of "fun" to all the other children of the world.

Killings
Laughing Jack is known for after killing someone, he replaces their guts with candy, a kind of way of "spreading fun".

He nails the children up the wall and then slices the children's organs open, and fills it with candy.

He is mainly targeted at killing children as mentioned, as, once again, a way of "spreading fun", but the children he kills doesn't matter what age they are, he has killed a baby once or more.

He is extremely heartless and egotistical, at another time when he nearly killed a baby, the mom was going to kill Jack, but instead of just moving away, he fades away and makes the mom fall down and kill the baby, who still is barely alive. After this the mom gets sent to a house for the criminally insane.

Trivia

 * To date, Laughing Jack is easily one of the most popular and recognisable Creepypasta characters, rivalling Slender Man, Jeff the Killer and Eyeless Jack.
 * Derek Gilbert, a News presenter, did a short documentary concerning his concerns about Laughing Jack and how children were becoming obsessed by what he saw as "occult material."
 * Many fans have found it disturbing that Laughing Jack was created by an angel, as this might imply the angel is the ultimate Bigger Bad behind the series, given that he unintentionally (or intentionally) poured so much capacity for hate into Laughing Jack.