In some 'Goku vs Beerus' fanfiction, a plot twist could be that Beerus discovers that Goku is actually related to an ancient and powerful race that Beerus once had a connection with. This could change the dynamic of their fight completely. Another plot twist could be that during the fight, Goku and Beerus are transported to a different dimension where the rules of power are different, and they have to adapt quickly to survive and continue their battle.
One interesting plot twist could be that Goku and Beerus end up teaming up instead of fighting. Maybe they discover a common enemy that is even more powerful than them. Another could be that Beerus loses his power temporarily and Goku has to protect him from other villains while also trying to figure out how to return Beerus' power.
In a 'Goku vs Beerus' fanfiction, it's really hard to say who would win. It could depend on how the author wants to write it. If the author wants to show Goku's growth, Goku might win through some new transformation or power - up. But Beerus is a powerful God of Destruction, so he also has a great chance of winning.
There could be a storyline where Beerus, out of boredom, decides to train Goku Black instead of fighting him. But Goku Black misinterprets this as a sign of weakness and attacks Beerus. This could lead to a battle where Beerus has to hold back at first to avoid killing Goku Black, but as the fight progresses, he realizes he has to use his full power to subdue him.
Well, it could be a story where Female Beerus takes Goku on a journey through different universes to find a special kind of food that only exists in a very remote place. Along the way, Goku trains in new ways under Beerus' watchful eye. They encounter various challenges and obstacles that test their skills and their relationship.
The plot might center around Goku being raised by Beerus in a more secluded place. Beerus could be training Goku to be his successor as a god of destruction. Goku would have to learn about the balance of destruction and creation, which is different from his usual Saiyan power - up goals. This would also mean that Goku would have a different view on the universe and its inhabitants. He might be more detached in some ways, but also more powerful and with a different moral code influenced by Beerus.
One interesting concept could be the power struggle. Beerus is an extremely powerful deity in the Dragon Ball universe with god - like powers, while Naruto has his own set of formidable ninja abilities. In fanfiction, they might explore how Naruto's chakra and jutsu would fare against Beerus' energy blasts and hakai ability. Another concept could be the clash of their worlds. The ninja world of Naruto is very different from the Dragon Ball universe, so seeing how the two settings interact, like how Naruto's friends and village would react to Beerus' presence, can be really engaging.
Another plot could involve a strange magical event that causes Goku and Female Beerus to swap powers for a short time. This forces them to adapt to each other's abilities and fighting styles. They initially struggle and bicker but eventually learn to cooperate. Along the way, they discover new things about their own powers as well as the power of their bond.
One interesting plot twist could be that Neji discovers a new power within his Byakugan that makes him evenly matched with Naruto's Nine - Tails power. Maybe he unlocks a hidden ability that allows him to see through Naruto's chakra cloaks or disrupt the Nine - Tails' chakra flow. Another plot twist could be that Naruto loses his access to the Nine - Tails' chakra during the fight, and has to rely solely on his own skills and training, making it a much more even match against Neji.
Maybe in the fanfiction, Naruto loses his chakra early on in the fight against Pain. But then he discovers a hidden power within himself that is not related to chakra, like a spiritual power from his Uzumaki heritage, which he uses to turn the tables on Pain.
Well, in the original Dragon Ball series, Beerus is an extremely powerful god of destruction. For Goku to kill him in a fanfiction would be a huge shock. However, in the realm of fanfiction, anything can happen. Fanfic writers often like to explore 'what - if' scenarios that deviate from the official canon. It could be interesting to see how the writer would justify Goku achieving such a feat, considering Beerus' overwhelming power.
In some fanfictions, a major plot twist is when Goku's ki energy starts to interact in unexpected ways with the magic in the Rosario Vampire world. For example, it might accidentally trigger a long - dormant spell or power within a certain youkai. This causes chaos as both Goku and the other characters have to figure out how to deal with this new situation.