Odion Ishtar

Odion Ishtar is the older brother of Marik Ishtar and one of his main Rare Hunters in Yu-Gi-Oh!

The Anime
Odion was adopted by Marik's parents, and was going to be the tombkeeper, until Marik was born (after his sister Ishizu). When Marik and Ishizu snuck out, their father punished Odion, but Yami Marik awakened inside Marik and killed his father. Odion contained Yami Marik within Marik.

He became one of Marik's Rare Hunters when Marik began seeking out Egyptian God Cards. During the finals of Battle City, Marik instructed Odion to pretend that he was Marik so that no one would know Marik's true identity. Odion dueled Joey with a deck of trap cards, and nearly defeated him, but Marik told him to finish Joey with the Winged Dragon of Ra. He summoned the fake Ra that Marik had given him, but the real Ra was angry for using a counterfeit Ra card and struck them both with lightning, knocking them out. Joey got up first and won the duel by default. Without Odion, Yami Marik reawakened.

Odion did not wake up until Yami Marik's duel with Yami Yugi, and attempted to help Marik defeat Yami Marik. In the end, Marik and Yami Marik were switched around, and Yami Marik was destroyed by Marik when he forfeited the duel.

Odion later appeared alongside Marik and Ishizu to witness the duel between Yugi and Yami, which was being played so that Yami could go through the door and rest.

Though he works for Marik as one of his Rare Hunters, Odion is not truly evil, and wants Marik's good side to overcome his evil side.