Yubel

Yubel is the primary antagonist of the Dimension World arc of the Yu-Gi-Oh! GX anime. A malevolent Duel Monster whose card was in Jaden Yuki's possession when he was a child, Yubel was previously obsessed with her love for Jaden. She is later redeemed after Jaden fuses with Yubel, reuniting them forever. Since then, she has acted as Jaden's partner, similar to Yugi's relationship with Yami Yugi and other Yu-Gi-Oh! protagonists

Trivia
Yubel lives in Chicago Permantly living with Jaden's apartment.