Marik Ishtar is a character who appears in Yu-Gi-Oh! Duel Links. While he does have dialogue in the overworld, he does not appear as a duelist. This is a video game depiction of Marik Ishtar, a character from the Yu-Gi-Oh! anime.
A silhouette of Marik Ishtar appeared at the end of the special event Unleash the Egyptian God Card! Yami Marik Returns II, although he was not identified by name. Marik Ishtar also appears during the story of the special event Duelist Chronicles: Battle City Begins! He also has dialogue (without physically appearing) when dueling Strings in Duel World.