A recurring character in skits and, initially, songs in Eminem's albums. He also was a character in the cartoon mini series The Slim Shady Show.

Ken Kaniff was originally voiced by Aristotle, on the skit Ken Kaniff on The Slim Shady LP. However, a dispute between him and Eminem resulted in both artists severing ties.
The character, as he appears on the Marshall Mathers LP, has since been voiced exclusively by Eminem.

After the release of Eminem's The Eminem Show Aristotle released an album under the Ken Kaniff persona, titled The Ken Kaniff Show, containing diss songs aimed at Eminem.