Master Chen is the main antagonist of the fourth season of the Ninjago: Masters of Spinjitzu TV Series.
Chen was requited by Lord Vortech to the Villain Army. Shortly after the first battle with the Hero Alliance, Lord Vortech asked Chen, where the Nindroids could be. At the exact moment, Nindroids come next to Vortech's throne and Chen says "Here they are!"
He is similar to The Joker, as they both enjoy drama, games, are insane, and have high pitched laughter.
His appearance is referenced to Shang Tsung from Mortal Kombat.
He may also be based on Mola Ram from Indiana Jones and the Temple of Doom.
Though while many Ninjago protagonists had been turned into snakes, Chen (with the exception of his cult and Garmadon) is the first Ninjago antagonist to be turn into a snake.
Chen claimed to have knowledge of the fate of Ray and Maya, Kai and Nya's parents; it is thus possible that he may have been in league with Krux.
Tommy Andreasen's fanfiction Way of the Departed expands on this implication, revealing that Chen had Clouse use his dark magic to plant the idea that they were the most powerful Elemental Masters in the minds of Acronix and Krux. Chen is also identified as having helped the pair find The Great Devourer's eggs that later hatched into the Vermillion. Chen is also implied to have turned the Elemental Masters against each other during the Serpentine Wars through similar methods as well as employing the powers of the Serpentine against them.