Ghost Kotsuzuka

Bonz, Sid, and Zygor are Bandit Keith's henchman in Yu-Gi-Oh!

The Anime
Bonz is a kid with a hideous ghoulish face, and the slightly smarter one of the three. Zygor is the big, dumb muscleman, and Sid is the cool guy with red hair.

Duelist Kingdom
They attacked Joey Wheeler, whom Keith picked on as bad as Kaiba did, and took him to a cave where Bonz dueled Joey while following Keith's instructions. Bonz used a card to resurrect his destroyed monsters as zombies, who were mostly invincible. Joey's Time Wizard could have defeated them, but unfortunately, it landed on a skull. Tristan attempted to fight Sid and Zygor when when he, Yugi, and the others arrived at the arena, but Sid threw a rock at him and Zygor punched him. Bonz lost to Joey when he used the Shield and Sword Card, but Keith had them seal the tunnel with a boulder when they left to trap them all inside. He then beat the three of them up and took their star chips.

Battle City
Sid, Bonz, and Zygor entered Kaiba's tournament in Battle City. Rather than duel for star chips, they put on zombie masks and scared people at the cemetery to get their locator cards. They attempted to do this to Yami Bakura, but he was unaffected by it, and dueled Bonz, taking the duel to the Shadow Realm. Yami Bakura gained the advantage, and soon told them that they were in the Shadow Realm, and if Bonz lost, they would be trapped there forever (or at least until Yami Bakura chose to set them free). Sid attempted to run, but came back from the other direction, as one cannot run from the Shadow Realm. Yami Bakura defeated Bonz, so he, Sid, and Zygor became trapped in the Shadow Realm, vanishing into shadowy clouds in the ground. Yami Bakura then took their locator cards so he could enter the final rounds.

They have not been seen since. In the Japanese version, they were sent to Hell rather than the Shadow Realm (though there is little difference between the two), with hands pulling them into the ground.