Forever Ninja

The Red Knight or Forever Knight Ninja is a member of the Forever Knights and a member of the Negative 10. He is defeated by Upchuck, who spited his own shurikens back at him. According to the Pop-Up version of Ben 10, the knight is a robot personally created by the Forever King, Driscoll to be his bodyguard. He first appeared in the end of Perfect Day and makes another appearance in Ben 10 vs. the Negative 10 (Part 1) and Ben 10 vs. the Negative 10 (Part 2) and does not have a voice actor(being completely mute). He attacks using the Forever Knights ninja gadget, like shurikens, twin sword, and lightsaber. In Ben 10: Alien Force video game, it appeared to be the forever ninja, a fighter in several stages. Possibly alluding that are more than one Ninja and that Forever Knight is actually a human.

Trivia

 * Some Red Knights also appear in Ben 10: Alien Force The Game.
 * Despite being called "Red Knight", his color is more of a brownish-maroon.
 * Red Knight is similar in appearance and abilities to the Marvel Comics character Deadpool, both known for their skills using twin katana. Ironically Red Knight dosn't speak at all where as Deadpool is known for never shutting up.