One possible plot could be a crossover where a Saiyan somehow ends up in the Naruto universe during the time of Kaguya. Maybe the Saiyan's power is sensed by Kaguya and she sees it as a threat or an opportunity. The Saiyan, with their battle - hardened nature, could get involved in the Naruto characters' fight against Kaguya, adding a new dimension of power and strategy to the battle.
Perhaps in the fanfic, a Saiyan is sent to the Naruto universe on a mission to study the chakra system, which is very different from their ki - based power. They encounter Kaguya, who is intrigued by the Saiyan's power. The Saiyan then teams up with Naruto and his friends. Naruto, being the main protagonist, tries to understand the Saiyan's way of life and fighting. Together, they face Kaguya, with the Saiyan teaching Naruto some new combat techniques based on their Saiyan abilities.
Well, it could be that the Saiyan is actually a long - lost relative of Kaguya. In this fanfic, the Saiyan's arrival in the Naruto world reveals a hidden connection between the Saiyan race and Kaguya. This connection could change the way the Naruto characters view Kaguya and their own history. The Saiyan might have different views on power and morality compared to the Naruto characters, which could lead to interesting conflicts and alliances.
Well, one possibility could be that Naruto, with his Saiyan powers (assuming some sort of crossover mechanic), has to deal with Kaguya in a new way. Maybe he forms a harem that includes characters related to Kaguya's story. The plot could involve battles against new threats while also exploring the relationships within the harem.
Naruto is a must. Kaguya, as a key part of the Naruto lore, would be in it. In terms of the harem, Ino could be one of the characters. She has always had an interest in Naruto to some extent. Tenten could also be part of it, perhaps drawn to Naruto's new Saiyan - like strength. And from the Saiyan side, Raditz could be introduced, creating some conflict as he initially tries to take advantage of Naruto's Saiyan powers but later might become an ally. There could also be some original characters created just for this fanfic.
Well, an interesting plot could involve a fusion of the energy systems in both Naruto and Dragon Ball universes. Naruto, as Super Saiyan Blue Naruto, could be tasked with saving both universes from a threat that is causing the boundaries between the two to collapse. He would have to use his newfound powers, which combine chakra and ki, to stop the chaos and restore balance.
Well, it could involve Naruto having some unique powers inherited from Kaguya. Maybe he discovers his true lineage gradually and has to deal with the expectations and the secrets that come with it. He might face new enemies who are interested in his connection to Kaguya, or he could use his new - found heritage to bring about a new era of peace in the ninja world.
A possible plot is that an ancient scroll is discovered in the Hidden Leaf Village. When Naruto reads it, it unlocks a latent power within him that is related to the Super Saiyan 4 transformation. He starts to have visions of a being with great power who looks like a Super Saiyan 4. As he delves deeper into understanding this new power, he has to train in isolation. His enemies, thinking he's weak during this training period, launch an attack on the village. But Naruto emerges in his Super Saiyan 4 form just in time to save everyone and defeat the villains. This form could also give him new abilities like flying without the use of his shadow clones and enhanced sensory perception.
The Saiyan's power is mainly based on their physical strength, ability to transform, and use of ki. Naruto has his chakra, with the Nine - Tails' chakra being a major part. Kaguya has her own powerful chakra and unique abilities like the All - Killing Ash Bones. In a fanfic, the Saiyan's physical might could be a match for Kaguya's brute force attacks. Naruto's chakra - based jutsu could be used to complement the Saiyan's attacks, for example, using shadow clones to create diversions while the Saiyan attacks directly. Kaguya's reality - warping abilities would pose a huge challenge to both the Saiyan and Naruto, forcing them to come up with new strategies together.
One possible plot could be that the reader is a new ninja in the Naruto world. They accidentally stumble upon Kaguya's hidden lair. Kaguya, instead of seeing the reader as a threat, is intrigued by this new presence. She decides to test the reader's skills and knowledge. The reader, in turn, has to use their wits and any ninja techniques they've learned to survive and perhaps even gain Kaguya's respect.
A possible plot idea is that Naruto discovers a new form of jutsu that allows him to dominate Kaguya's mind. He then uses this power to make her see the error of her ways and help her become a force for good in the ninja world. Also, we could have a plot where Naruto forms an alliance with other powerful ninjas and together they dominate Kaguya, but then have to deal with the moral implications of such dominance.
One possible plot could be that Naruto, through some strange space - time rift, ends up in Kaguya's era. He could then team up with her against a common enemy that threatens both their worlds. Naruto's unique jutsu and his never - give - up attitude might inspire Kaguya, and together they could create new and powerful techniques.
Well, one possible plot could be that Naruto somehow gets transported to the DC Universe where the Justice League operates. He meets the Saiyans who are also there for some reason, like a universal rift. They all have to team up to fight a common enemy that is threatening both the Naruto world and the DC world. Maybe it's a powerful demon from Naruto's world that has gained new powers in the DC Universe and is causing chaos.