Johnny C. (nicknamed Nny) is the fictional protagonist of the comic book series Johnny the Homicidal Maniac by Jhonen Vasquez. Johnny is a serial killer, mass murderer, and spree killer in an unidentified city in the United States.

Johnny makes cameo appearances in the spin-offs of the series Squee!and I Feel Sick, as well as the television series Invader Zim. The series focuses on Johnny C., or Nny for short (as in (Joh-)Nny).

He is a deranged killer who tortures and murders other characters. He murders anyone who annoys him even slightly in the most elaborate, sadistic ways possible, then drains their blood and paints one of the walls in his house with it (to keep the color of the blood the same, or, later in the series, to keep something from getting out). If the situation dictates, Johnny is also willing to murder innocent people who have done him no wrong; in his mind, however, even they deserve their fate.

The vast majority of Nny's victims are (apparently) bad people who deserve what they get, at least by his perceptions. He has killed people in the dozens (if not hundreds or perhaps even thousands). Authorities are unable to capture Johnny and seem unaware of his existence, although his crimes are often witnessed in public and reported by the few who survive.

Johnny usually has conversations with his victims before he kills them or tortures them (or, in some cases, lets them go). However, he mocks their pleas for mercy as "noise". He is delusional, paranoid, and devoid of remorse.

His insanity manifests itself in several entities, such as Nailbunny, the closest thing to a conscience that Nny possesses; and Psycho Doughboy and Mr. Eff, two styrofoam Pillsbury Doughboys that argue over whether to let Nny commit suicide or continue living to feed the wall. Later in the story a new character from Nny's mind arises, Reverend Meat, who attempts to invoke feeling in Nny as he searches for numbness.

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