Yubel, a monster card that Jaden owned when he was still young, appeares in the third season of Yu-Gi-Oh! GX as the main antagonist. It exists as a real Yu-Gi-Oh card as well. She's the guardian of Jaden's Ancestor, and Jaden is the reincarnation of his ancestor so she protected him as well. Until she was exposed to the Light of Destruction in outer space which drives her to insanity.
Note: All credit regarding this information leak goes to XOF.
Among these, are cards owned by the protagonist Jaden Yuki and other prominent characters such as Aster Phoenix, Chazz Princeton, Alexis Rhodes and Bastion Misawa, meaning that they might be the first unlockable characters once GX is added. The datamine also shows the rarity of some cards and how duelists could get them.
Zane is a powerful duelist from GX series, his deck is themed around Cyber Dragon and it's other forms and fusions, his deck then centered around both Cyber Dragon and Cyberdark later on in the series.
Yubel is an androgynous spirit that was drawn from a male child. Yubel is neither male nor female so in the respects of characteristics we think of her as feminine as she lacks enough masculine qualities to be male. Most notably vocal