The Dragon Ball franchise is known for featuring some of the biggest power trips in shonen history, with characters constantly giving their all in the quest to attain greater power. Even the act of fusing one's self with another is a rather casual trope that appears in the series time and time again and is handled rather flippantly so — almost humorously at times.
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That being said, one can't deny that any moment featuring a fused character is genuinely quite exciting, with viewers being able to witness their wildest fantasies come to life as two beloved characters fuse their very beings to become an all-powerful fighter who can bring the best of two worlds together while fighting a massive threat.
Keeping this in mind, here are ten of the most powerful fusions to ever make an appearance in Dragon Ball.
10 Veku
When Vegeta and Goku mess up the Fusion Dance, then the result is a flawed fusion by the name of Veku, who has little to no power in battle and can only run until the fusion timer runs down.
Aside from comedic purposes, there's nothing that Veku can really do in a practical situation. In fact, the only reason why Veku even makes this list is that there aren't really that many proper fusions in Dragon Ball at all.
9 Aka
The OVA Dragon Ball: Yo! Son Goku and his Friends Return!! marks the return of an animated feature in the universe of Dragon Ball after nearly a decade. This OVA featured a bunch of interesting things, including Vegeta's long-lost brother and the existence of two characters who could fuse as well.
Abo and Kado — rather ingenious names — are the antagonists of this OVA, who don't really put up much of a fight as separate fighters. However, once they merge into Aka, they become a serious threat that the Z Fighters need to take care of.
8 Old Kai
One thing that most people might not be aware of when it comes to King Kai is the fact that he's actually the result of a permanent Potara Fusion!
The Old Kai is actually a fusion of a young Elder Kai and an Old Witch, giving the god a boundless amount of knowledge at the expense of a frail body. That being said, the Old Kai is still a god, and can definitely draw on huge reserves if need be.
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However, given the fact that the Old Kai hasn't really had his battle aptitude tested, one can't really make a definitive statement in this matter.
7 Kibito Kai
Kibito Kai is the result of a rather unfortunate turn of events when Shin and Kibito end up trying the Potara Earrings out in jest. Unfortunately, they end up fusing permanently and stay like this for a while until they finally use the Dragon Balls to undo this fusion.
That being said, Kibito Kai wasn't exactly torn up about this fusion — he was actually pleased about the increased height of his new body. While his power is mostly a mystery, Kibito Kai certainly wouldn't have been a slouch in battle.
6 Gotenks
A fusion that became quite relevant during the Buu Saga, it seemed that the show finally devised a purpose for Goten and Trunks when they managed to fuse into the powerful Gotenks in a bid to take down Majin Buu once and for all.
However, Gotenks' own hubris was the cause of his downfall. He never really took battles seriously and goofed around with the limited time he had as opposed to actually perform something meaningful. It's no wonder why the reliable duo of Goku and Vegeta took center stage during the finale of this arc.
5 Super Android 17
While most people prefer to discard Dragon Ball GT's existence from the official continuity of Dragon Ball, there's no denying the fact that some of the characters introduced in the series are definitely quite powerful in their own right.
The best example of this is Super Android 17, a combination of Android 17 and Hell Fighter 17 who ends up being absolutely deadly in combat. His power even puts Goku in a tight spot, and he requires a fair bit of strategy in order to finally get the upper hand over this deadly fused Android.
4 Fused Zamasu
Dragon Ball Super introduced a number of powerful characters capable of fusing, with the merging of Zamasu and Goku Black being one of the more notable fusions in the entire series. However, it also proves to be a fatal error in judgment due to Zamasu's immortality clashing with Goku Black's mortal body.
So, when Future Trunks manages to condense the power of the Spirit Bomb into a deadly sword slice that splits Fused Zamasu apart after a frantic and heart-pounding battle, the body of the fused antagonist ends up spasming and expanding grotesquely. This prompts Goku to summon Future Xeno in a bid to eliminate Fused Zamasu once and for all.
3 Kefla
The Tournament of Power featured several powerful fighters from their respective universes... such as the duo of Caulifla and Kale from Universe 6.
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The duo was so powerful in their own right, but it's their fusion that truly put Goku against the ropes. The Saiyan needed to tap into his power of Ultra Instinct in order to turn the tide of battle and eliminate this powerful fused warrior once and for all.
2 Gogeta
Dragon Ball Super: Broly is easily one of the most important movies in the history of Dragon Ball, mainly since it makes two popular facets of the series canon once and for all — Broly... and Gogeta.
After Broly taps into the limitless power of a Legendary Super Saiyan, Goku and Vegeta decide to get the upper hand on battle by using the Fusion Dance to become Gogeta. The ensuing battle is a visual spectacle, with Gogeta unleashing numerous powerful moves to best the berserker that is Broly.
1 Vegito
However, while Gogeta is a powerful fighter in his own right, the lore of Dragon Ball has clearly stated the fact that the Potara Earrings allow for a cleaner fusion. By that logic, it's clear that Vegito edges out his counterpart in terms of sheer potential.
A fight between this fighter and Gogeta would be an absolute treat... but due to the impossibility of this particular situation, one can only look at the individual prowesses of both these fused fighters to compare their power levels.