When Dartz and his "evil motorcycle-riding henchmen" aren't invited to Marik's Evil Council, he decides to hold his own. It's apprentally "much better" because they serve pizza rather than tacos. Like Marik, whenever he swears, an [EFF!] sound is heard instead of the traditional bleep. In his revenge he planned on spamming Marik's YouTube account, which apparently did not work. In his second attempt to get revenge, he tried the "is your refrigerator running?" prank call, which spectacularly failed as Marik told him he didn't even have a refrigerator (Although Marik hadn't realized it was a joke until Dartz hung up).
Dartz and the others also apparently play Dungeons & Dragons according to the spam comments on Marik's YouTube account.
As of Marik's Evil Council of Doom 3, he is voiced by Takahata101 and his hair changes color whenever the shot changes, though his hair has been seen continuously changing colors in a single shot in episode 64. Dartz then began speaking with a strong Cajun accent and when he told his minions to duel Marik, they mistook it as to "do" Marik instead. Later, he ordered his minions to cut Yugi Muto's and Mai Valentine's decks in half. The henchmen, however, misinterpreted "deck" as "d*ck", which confused Yugi when they called him. Dartz's henchmen agree that he is a "notorious douche". Rafael cited him taking Channing Tatum's soul for fun as an example.
Overall, his character is a combination of Coiffo, the main antagonist of Perfect Hair Forever, and Boomhauer from King of the Hill, in terms of appearance and mannerisms. Also, ironically, he can't understand anything that Zombie Boy says (despite that he can talk normally).