Wikileaks appears as a regular rat with dark gray fur and a blond head of hair.
In "Bass to Mouth", he enjoyed posting the South Park Elementary students' gossips and secrets on Eavesdropper, even though any potential self-benefit is outweighed by the cost of running and maintaining a website. He is also the older brother of Lemmiwinks. Wikileaks was shown to be intelligent enough to operate a computer, and record things with a helmet cam.
- Wikileaks' name and character is a reference to Julian Assange's website WikiLeaks, on which leaked government documents are posted and made available for download. The character's hair also resembles Assange's.
- Wikileaks is also used to reference the rat and villain "Martin" from The Secret of NIMH 2.