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

Greiger, Yu-Gi-Oh! Wiki

The Spriters Resource - Full Sheet View - Yu-Gi-Oh! 5d's Tag Force

Goodwin assassination attempt - Yugipedia - Yu-Gi-Oh! wiki

Yugioh Review

Sean Schemmel - Wikiwand

I'm still unsure if Yu-Gi-Oh GX characters actually look like

Tetsu Trudge, Yu-Gi-Oh! Wiki

YGOrganization Phantom Nightmare [TCG]

Yusei Fudo, Wiki

Yu-Gi-Oh! 5D's - Episode 015 - Yugipedia - Yu-Gi-Oh! wiki

Yu-Gi-Oh! 5D's - Wikiwand

Greiger Character Profile : Official Yu-Gi-Oh! Site

List of Yu-Gi-Oh! 5D's chapters - Wikipedia