Greiger, Yu-Gi-Oh! Wiki

Greiger, known as Bommer in the Japanese version, was initially one of Goodwin's 5 Dueling Assassins that was placed in the Fortune Cup with the intent of exposing the Signers, as well as a member of Iliaster. Later, he became a member of the Dark Signers, bearing the dark mark of the killer whale and having his "Earthbound Immortal Chacu Challhua" (however, in Z-one's time-line he was not a Dark Signer). An honorable Duelist, Greiger was prideful, yet stoic. Likely of South American origin, he

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