Forever Ninja

The Red Knight or Forever Knight Ninja was a robot member of the Forever Knights and a member of the Negative 10.

Ben 10
He was defeated by Perk Upchuck, who had spit 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 made 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 battles by using the Forever Knight's ninja gadgets, like shurikens, twin swords, lightsabers, machetes, and has enhanced speed. In the Ben 10: Alien Force video game, he appeared as the Forever Ninja, a fighter in several stages.

Ben 10: Omniverse
It returned in Return to Forever.

Ben 10

 * Perfect Day (first appearance)
 * Ben 10 vs. the Negative 10: Part 1
 * Ben 10 vs. the Negative 10: Part 2

Omniverse

 * Return to Forever (first re-appearance)

Trivia

 * Some Red Knights also appear in Ben 10: Alien Force The Video Game and Ben 10 Ultimate Alien: Cosmic Destruction (in Tokyo)
 * Despite being called "Red Knight", his color is more of a brownish-maroon, untill Ben 10: Omniverse were he is crimson red.
 * The raised portions on the back of his helmet resemble the ears on the cowls of DC's Batman and Marvel's Black Panther. Both of these characters fight with similar ability to the Red Knight. He is slightly similar to Marvel's Deadpool.
 * He is quite resemblant to Snake Eyes from G.I. Joe.