Card shop owner
Yu-Gi-Oh! episode 55: "Stalked by the Rare Hunters"
The merchant or card shop manager is a clerk who owns the RPG Hobby Trading Cards shop.
The merchant's shop stocked the new Duel Disks that were used in the Battle City tournament. He also worked for the Rare Hunters, informing them when someone who owned a rare card registered for the tournament; he altered Joey Wheeler's ranking in order to allow them to have access to his "Red-Eyes Black Dragon". In the manga, Dark Yugi figured this out and went straight to the shop to confront the merchant, only to find Pandora instead.