Princess Kenny

Princess Kenny is the hidden final antagonist of South Park: The Stick of Truth. She is the alter-ego of Kenny McCormick from South Park, who is usually "heroic", and was originally a main protagonist until she was overtaken by greed.

The Stick of Truth
When the kids of South Park became fighting over a simple twig they named The Stick of Truth, Kenny was the fair maiden of the humans with the Wizard King, who rivaled the elves. Throughout most of the game, Kenny serves as a playable protagonist of assists the player in the their quest for victory.

However, nearing the end, Kenny betrayed the group and took the stick himself and battled both the elves and humans. Kenny later chugs a vial of zombie goo, turning him into a Nazi zombie and even furthering his power. However, he was still defeated when the player, dubbed Sir Douchebag, breaks the sacred oath of the humans and farts on Kenny's balls, defeating him.

Kenny later returned to normal afterwards and blamed his antagonistic role on PMS.

Trivia

 * After Kenny betrays the player, Morgan Freeman explains to the "audience" that he was the true inheritor of the stick due to an overly complicated series of events that happened in his life. This is obviously not true and is played for laughs, however.
 * Kenny's princess outfit is almost identical to Princess Zelda's from The Legend of Zelda franchise.
 * Coincidentally, the real Kenny would occasionally become the secondary antagonist, when his friend Cartman becomes the main antagonist in one episode.