Sqweegel

Sqweegel is the main antagonist in the book Level 26: Dark Origins and a particularly cruel and sadistic villain (probably one of the most evil human villain in this Wiki). His cruelty is so limitless than he can't be classified in the 25 levels of dangerousness established by the FBI, making him the only known criminal to be ranked Level 26 (During the time of the first volume).

Description
Sqweegel always wears a latex full-body suit which allows him to never leave fingerprints or traces of DNA.

Powers and Abilities
Despite being a simple human, Sqweegel is an extremely skilled contortionist and is able to realize virtually superhuman things. He can move without any noises, hide in very tight stashes, pass through awfully petty passages...

He is also an especially talented killer and, despite his craziness, he is very intelligent.

History
Early Life

Sqweegel was the most wanted criminal by the FBI. He committed countless atrocious murders  in every continents and his victims include children and babies. His nickname "Sqweegel" comes from noises heard by a young girl when his mother was killed by him in a carwash ("sqweegle sqweegle").

Once, a FBI agent named Steve Dark has almost succeeded in apprehending Sqweegel, but the latter retaliates by killing all his family. After that Dark chooses to leave the the FBI.

Current Life
In present days, Sqweegel continued his murders. After a particularly ignoble murder of a baby, a former colleague of Dark convinces him to back into service.

Sqweegel still torments the life of Dark, notably by raping his wife. He also brutally rapes three teenagers. Later, he kidnaps Dark's wife and kills her, but he's finally killed by Dark.

Trivia

 * A serial killer who is also named Sqweegel and who also wears a latex full-body suit appears in the fourth episode of the eleventh seasons of CSI: Crime Scene Investigation. The episode also contains references to the book such as the car wash sequence.