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DannyDarko
DannyDarko(aka.The Dark Minecart or DarkoTDM)is Markiplier use the name of DanTDM's alter egos,his back was a circle that makes him stronger.
Danny was also an Demon/Evil version of Dan.
Danny's first appears at DARKIPLIER vs ANTISEPTICEYE the video,and he will be in DanTDM's video sooner.