Yubel is a Duel Monster Spirit from Yu-Gi-Oh! GX. In their previous lives, Jaden Yuki promised to never forget Yubel, and so after being abandoned and forgotten by a small well-intentioned Jaden in the present, they sought revenge on him. After being reminded of his promise and learning of the suffering Yubel went, Jaden used Super Polymerization to fuse his spirit with Yubel's, finally reuniting the two. This also allowed Jaden to use Yubel's powers and communicate with them at any time.