Mister Enigma was a potential foe of Linkara from the Channel Awesome Multiverse. After Mysterior got tired of being mysterious for Linkara, he left, allowing Mr. Enigma to take his place.
While Mysterior was clearly Linkara's foe, Enigma may or may not have been, leaving Linkara confused as to his true purpose.
He possessed the ability to make human skulls appear from nowhere. Linkara pointed out that the skull chosen looked like the one that Phelous had been claiming belonged to the Nostalgia Critic, which made little sense as the Critic had merged with the Plot Hole.
Enigma suggested that it was the skull of a clone of the Nostalgia Critic, but Linkara didn't believe it. Linkara, trapped in his apartment due to his ongoing battle with Jaeris, considered asking Enigma for help. Enigma suggested he may or may not give it, because he was mysterious, leading Linkara to order Enigma to never contact him again.