Elmo

Elmo is a Muppet from Earth-Sesame. He has a crippling addiction to cocaine, and has committed multiple murders.

History
Elmo was born at the Sesame Street Hospital, his mother dying when she gave birth to him. His father kept Elmo in the basement of his house for two months when Elmo was ten years old, feeding him through a mail slot installed in the basement door. The exact reason for this is unknown, but it's mainly attributed to the fact that Elmo's father was a drunk and known racketeer, so he may have locked Elmo up to keep him away from his dealings.

Whatever the reason, when he was let out at the end of the two months, Elmo ran away from his home, attempting to scrounge out a life for himself in the alleys of Sesame Street. He failed to supply for himself, and lived homeless. It is unknown if Elmo had any encounters with any other psychotic Muppets, but he eventually began to develop acute psychosis, and an addiction to multiple drugs (cocaine being the foremost, most likely supplied by Cookie Monster.)

Eventually, a TV crew came to Sesame Street and hired Elmo to be their main character, along with multiple other Muppets. Elmo agreed to their contract and joined the TV crew.

Elmo soon became popular among the children who watched Sesame Street, and began to exert influence over the filming crew, blackmailing most of them into complete submission. As time wore on, Elmo's psychosis began to surface, driving him to order large shipments of cocaine from his supplier (which he insisted "calmed him".)

The mass amounts of cocaine he ordered made at least a few Muppets rich, and can be attributed to the rapid growth Cookie Monster's drug empire.

Murders
On June 12, 2007, after a series of issues with the Sesame Street producers, Elmo murdered Prairie Dawn, a female Muppet of six years of age. Her body was discovered behind a playground slide by a Sesame Street cameraman. The producers of the show threatened to fire Elmo, who responded with, "You can't do that. Elmo owns you."

It is theorized that Elmo murdered Prairie Dawn due to his psychotic tendencies and his monumental amount of cocaine intake, but the murders after were just due to the fact that he found it more satisfying than drugs.

After threatening to fire Elmo, the producers cancelled the show for a small amount of time, which they told the public was due to "an employee strike". Elmo apparently decided to take matters into his own hands, and murdered the producers of the show. He quietly replaced them with others under his control, and ordered them to act "as if nothing had happened". The Sesame Street show resumed broadcasting as normal.

Elmo began to use Sesame Street as a cover for his serial murders, which spanned multiple years.