The plot might involve Naruto trying to prank Android 17 by challenging him to a fake competition. Naruto could pretend to be really bad at it at first, making Android 17 overconfident, and then suddenly show his real skills and win in a very unexpected way, leaving Android 17 shocked.
Well, in such a fanfic, Naruto might use his shadow clone jutsu for the prank. He could make clones that look like other Z - fighters and confuse Android 18. Maybe the clones would act all goofy around her, like trying to do the rasengan in a really clumsy way right in front of her.
In addition to Naruto and Android 17, there could be other characters involved too. For instance, Sasuke might make an appearance. He could either be in on Naruto's prank or be a bystander who gets caught up in the chaos. Also, some of Android 17's friends or allies from the Dragon Ball universe could potentially show up to see what's going on with him.
The plot could start with Rias inviting Naruto to her clubroom as a new acquaintance. Naruto, being the mischievous type, sees a chance for a prank. He takes some butter from the kitchen (assuming there is one in the clubroom) and spreads it on Rias' chair. When Rias sits down, she realizes what's happened and is both annoyed and amused. This could then lead to a series of events where Naruto has to perform some tasks for Rias as a sort of punishment, and during these tasks, they get to know each other better and form an unlikely friendship.
The prank could also lead to an unexpected alliance. Maybe after the prank, Android 18 realizes that Naruto is just a fun - loving guy and they end up teaming up for some other adventure. They could combine their powers in unique ways. For example, Android 18's strength and Naruto's ninjutsu could be used to take on a powerful enemy. This would completely shift the direction of the fanfic's storyline.
Maybe Naruto pulls a big prank and then has to report the outcome to the council. It could be a humorous situation where the council's reactions range from shock to amusement.
Well, it could be about Android 18's adventures in a new world created in the fanfic. Maybe she teams up with some other characters to fight a new threat.
The plot might involve Naruto and Sasuke. They play a prank on the villagers who used to shun Naruto. However, the villagers end up seeing Naruto in a new light. They realize that he's just a fun - loving kid who doesn't mean any harm. This could lead to a better relationship between Naruto and the village.
A possible plot could be that Android 18 and Goku are thrown into an alternate dimension where they have to rely on each other to survive. In this dimension, they face challenges that test their friendship and fighting skills. Android 18 might learn some of Goku's signature moves and Goku could learn more about the technology within Android 18.
It could be a story where Naruto's positive energy starts to influence Android 21's darker side. Android 21 has a somewhat sinister side to her in the original context. But Naruto's infectious optimism and his belief in the good of people could start to change her. They might go on a journey to find a way to completely purge Android 21 of her negative tendencies, and in the process, they develop a deep bond.
One possible plot could be that Android 21 somehow ends up in the Naruto universe. Maybe she is initially seen as a threat due to her power. Naruto, being the kind - hearted hero, tries to understand her instead of attacking right away. They could team up to fight a common enemy that has the potential to destroy both their worlds.