Dragon Ball Super reintroduces Uub to the series, and he bring a major revelation that improves Goku’s original ending from the Dragon Ball Z era.
Dragon Ball Super has made a huge improvement to how Goku’s story ended. Chapter 66 of Dragon Ball Super brings the Galactic Patrol Prisoner saga to a highly-anticipated close, as Goku powers-up, defeats Moro, and gives the reassuring thumbs-up, but the Saiyan received assistance from a most unexpected source. In a previous Dragon Ball Super chapter, Goku squandered a golden opportunity for victory, accidentally letting Moro absorb the angelic power of Merus. Goku’s only hope was destroying the crystal inside Moro’s head, but he required Ultra Instinct to do so, and no one on Earth could provide the necessary God energy.
In a surprise twist, Dragon Ball Super brings back Uub in chapter 66, the youngster who first debuted at the very end of Dragon Ball Z. Never one to waste a good opponent, Goku killed Buu with a Spirit Bomb, but wished the wicked villain could be reincarnated into a good guy. As a reward for saving the universe, King Yemma granted this wish, and Buu’s power was reborn into a humble villager known as Uub. The final episode of Dragon Ball Z (set after Dragon Ball Super), sees Goku take on Uub as a student, flying off toward his next adventure. It now appears that Uub inherited the God ki of the Grand Supreme Kai inside Majin Buu, and he donates this to Goku, powering the Saiyan into Ultra Instinct mode and allowing him to crush Moro easily.
Revealing that Uub possesses God ki represents a major change to the character, making the youngster meaningful after years of Dragon Ball anonymity. Buu was such a chaotic villain, he likely never knew how to harness the strange ki inside of him, lacking the refined control that Goku learned through intense Ultra Instinct training. Uub, on the other hand, has a calm and peaceful nature that might allow him to master Ultra Instinct with the right tutor, and this added wrinkle dramatically improves Goku’s original Dragon Ball ending.
For some, Goku’s decision to abandon his family (again) and fly off with Uub in the final Dragon Ball chapter was an unsatisfying conclusion. For years, Goku neglected his duties as a father and a husband to train and beat up villains, and after Majin Buu’s defeat, it looked like those days were finally over. Especially after missing out on the first chapter of Goten’s life, Goku might’ve wanted to actually settle down, but instead, he opted to train a brand new character. Choosing Uub over his family fits Goku’s character, but doesn’t exactly resonate as an ending to such an epic journey. Knowing that Uub possessed God energy, however, gives Goku a justified reason to take interest in the youngster, since the ability is so rare and Goku is one of the few capable of showing Uub the ropes.
The revelation of Uub’s God ki doesn’t necessarily contradict the end of Dragon Ball (or even Dragon Ball GT, unfortunately) but the shock reveal might be a first step towards rewriting Goku’s future. The longer Dragon Ball Super runs, the more likely it’ll begin to loosen the canon surrounding Dragon Ball’s final chapters. With Uub now officially reintroduced, the youngster could be incorporated into future story arcs, then conveniently made to forget everything by Whis ahead of his “first” meeting with Goku at the World Martial Arts Tournament. Featuring Uub more heavily in Dragon Ball Super’s future could finally allow the budding warrior to meet his potential as an exciting and powerful character.