Duel Dragon

Duel Dragons are a group consisting mainly of Dragon-Type Synchro Monsters (the exceptions are "Machine Dragon - Power Tool", which is a Machine-Type and "Underworld Dragon Dragonecro", which is a Zombie-Type Fusion Monster) shown in the Yu-Gi-Oh! 5D's manga. They appear to have something to do with the Skeleton Knight. Three of the Duel Dragons shown are counterparts of the Signer Dragons, hinting that they will have a similar role. They can be identified by their names being "(Adjective) Dragon and 1 or 2 words" with the first adjective and Dragon written in Kanji instead of Katakana normally used in Japanese cards.

Some of the Duel Dragons have marks that resemble the Mark of the Dragon somewhere on their bodies. Duel Dragons possess a strong miasma which causes their owners' personalities to become darker, or even taking over them. Also, they appear to have more occult powers; When attacking Yusei, Leo's dragon showed him memories from Leo himself, for example.

According to Rex Goodwin, since ancient times, the Turbo Duel has been a ritual designed to fight and seal the darkness, and that the Duel Dragons were specifically designed for such rituals. In the past, they were fought on horseback. He says they are cards which sealed the dragonic power of the priests who controlled them, and adds that controlling or being controlled by that power depends on the strength of the Duelist's mentality. Because of that, he now is gathering Duelists with strong mentality in order to control the Duel Dragons, and according to him, save the world from Skeleton Knight.

Usually, the Duel Dragons are blank cards which take form after obtaining a holder, but there is more than 1 way to obtain one. So far, the known methods are:
 * Sect Ijuin obtained his "Demon King Dragon - Beelze" from Skeleton Knight in exchange of his services.
 * Yusei Fudo had to undergo a ritual involving the Dragon's original owner in order to obtain it.
 * Jack Atlas obtained a blank Duel Dragon from Goodwin, which took form right after being held by him.
 * When Crow Hogan passed by a blank Duel Dragon, the card's black aura took form of a dark version of himself, and if Crow defeated it, he'd obtain the Dragon.

Known Duel Dragons and holders

 * "Machine Dragon - Power Tool" - Leo
 * "Fairy Dragon - Ancient" - Luna
 * "Jeweled Demon Dragon - Red Archfiend" - Jack Atlas
 * "Flashing Carat Dragon - Stardust" - Yusei Fudo
 * "Demon King Dragon - Beelze" - Sect Ijuin
 * "Void Ogre Dragon" - Kalin Kessler
 * "Underworld Dragon Dragonecro" - Skeleton Knight