The Red Knight also known as the Forever Knight Ninja is a member of the Forever Knights and the Negative Ten. The Red Knight made his only appearance in Ben ten vs. the Negative Ten where he served as a member of the Negative Ten. Red Knight is actually a robot who was built personally by the Forever King, Driscoll he was defeated by Ben as Upchuck when he burped his (Red Knight) own shurikens back at him. Red Knight is completely mute, and he attack using ninja like gadgets such as shurikens, twin swords and a lightsaber like sword.
- Despite his name Red Knight is actually a brownish-maroon color