A plot could involve a power - hungry villain who tricks Naruto into believing that Goku is a threat to his world. The villain gives Naruto a weapon that can disrupt Goku's energy. Naruto, believing the false information, attacks Goku. Goku, not wanting to harm Naruto at first, holds back. But as the fight progresses, Naruto manages to use the weapon and deal a fatal blow. Or perhaps there's a tournament across different universes where the rules are twisted, and Naruto, in order to protect his friends in the Naruto universe, has to eliminate Goku who is unbeatable in normal circumstances.
Well, here's an interesting plot. There could be a prophecy in both the Naruto and Dragon Ball universes that says one must die for the other to reach a new level of power. Naruto and Goku initially don't believe it and try to find a way around it. But as events unfold, they are pushed into a battle. Naruto, with his strong sense of duty to his own world and the people he loves, decides that he has to be the one to end Goku's life. He uses his Sage Mode combined with some new - found power from an ancient artifact in the Naruto universe to overpower Goku in a long and drawn - out battle that tests both of their limits.
In 'naruto black goku fanfiction', a plot could be that Black Goku is somehow connected to an ancient evil in the Naruto world. For example, there could be a long - forgotten scroll or prophecy that mentions a being like Black Goku. When he arrives, he starts to awaken dark forces that were once sealed away. Naruto and his friends then have to go on a journey to find out the origin of Black Goku and how to stop these newly awakened threats. Along the way, they might encounter new types of enemies and also gain new powers to face Black Goku and the emerging darkness.
Perhaps they could start off not knowing they are brothers. Naruto is in his ninja world and Goku is in his. Then, a strange rift in the dimensions brings them together. They realize their connection when they notice similar powers or markings. After that, they train together and combine their unique skills, like Naruto's shadow clones with Goku's ki attacks, to face challenges in both worlds.
One idea could be a tournament where Goku and Naruto are both invited. They start off as rivals but then realize they have more in common as they face powerful opponents together. Another could be a situation where an enemy from Goku's universe somehow ends up in Naruto's world and they have to team up to defeat it. A third idea is that a magic spell or some kind of power - related accident causes their powers to be swapped, leading to comical and also challenging situations as they try to adapt to each other's abilities.
A possible plot could be that there is a cult that worships Asura and they believe Naruto is the key to bringing back Asura in his full form. They try to manipulate Naruto into doing their bidding. Naruto has to figure out their true intentions while also dealing with the fact that he might actually have the power to bring Asura back. This creates a moral dilemma for him as he doesn't know if bringing Asura back is a good or bad thing for the ninja world.
One idea could be that Naruto is kidnapped by an enemy who wants to use his Nine - Tails power for their own evil plans. His friends then have to embark on a dangerous rescue mission, facing various traps and powerful foes along the way.
One idea could be that Goku and Goku Black are forced to team up against an even greater threat from another universe. They start to understand each other's fighting styles during the battle and gradually develop a grudging respect for one another.
In some versions, the female Goku could be part of a prophecy. The two Gokus meet, and at first, there is some confusion and misunderstanding. But as they get to know each other, they discover that they are key to fulfilling the prophecy. They combine their powers and defeat an ancient evil that was threatening both of their worlds.
Well, perhaps in this fanfiction, Goku Black makes a fatal mistake. He could underestimate Goku's ability to adapt during battle. Goku, being the experienced fighter he is, notices this weakness and uses it against Goku Black. He might use a combination of his signature moves like the Kamehameha in a new and unexpected way that catches Goku Black off - guard, leading to his defeat.
One idea could be a story where Bulma creates a new device that accidentally sends Goku and her to a parallel universe. There, they have to work together to find a way back home while facing new and strange enemies. Another could be a time - travel plot where they go back in time to before Goku met Chi - Chi and Bulma realizes she has feelings for him. The third idea is a story where Goku and Bulma get trapped on a deserted planet and must rely on each other's skills to survive and escape.
One idea could be a crossover universe where Goku somehow ends up in the Naruto world and meets Sakura. They could team up to fight a new common enemy that is causing chaos in both their worlds. Maybe this enemy has the ability to steal energy like the Saiyans but also uses genjutsu like the ninjas.