In fanfiction, the Naruto Reverse Harem Jutsu used on Kaguya could lead to some really interesting scenarios. Maybe it could be used as a comical moment to catch Kaguya off - guard. For example, she might be in the middle of some grand, menacing plan when suddenly the jutsu is cast and she's surrounded by a bunch of Naruto clones all vying for her attention in a rather silly way. This could potentially disrupt her concentration and give the protagonists an advantage in the fight.
Often, it can show a different side of Kaguya. She's so powerful and usually in control, but the jutsu can make her seem more vulnerable as she has to deal with this strange and unexpected situation. For example, she might have to waste time trying to figure out what's going on with these clones instead of focusing on her main goals.
One common theme is the development of relationships. Since it's a harem, Naruto has to build different kinds of relationships with multiple characters. Another theme is the use of jutsu in a creative way to attract or interact with the harem members.
It's also possible that some non - human characters could be part of the harem. For example, some of the tailed beasts in human form (if that's possible in the context of the fanfiction). They would bring their own set of powers and a very different kind of relationship with Naruto compared to the human characters in the harem.
Sakura could also be included. She is a strong and independent character. Her medical skills would be useful in the harem, and her relationship with Naruto, which has evolved over time, could add an interesting dynamic to the group.
Another scenario could be that Naruto and Sasuke discover a new power within themselves during the fight against Kaguya. This new power could be related to their friendship or their connection to the Sage of Six Paths. They then use this power to finally defeat Kaguya.
Most likely Naruto and Sasuke. In the original series, they were already very powerful when they faced Kaguya, and in fanfiction, they could be even more so. Their combined strength and determination usually make them the favorites to win.
The 'Naruto Harem Jutsu' in fanfiction is a cool idea that fans have come up with. It allows for a lot of creativity. Writers can explore different character dynamics when Naruto uses this jutsu. For example, they can show how Naruto deals with the sudden attention from multiple characters. But when it comes to the 'lemon' part, it's better to focus on the positive and family - friendly aspects of the Harem Jutsu fanfiction, like the development of relationships, the humor in the situations Naruto gets into, and how the other characters react to his jutsu.
One interesting concept could be how the harem aspect affects Naruto's relationships with different characters. For example, it might show new dynamics between him and his female comrades as they all vie for his attention in a different way than in the original story.
In some fanfictions, the Harem Jutsu plotline involves Naruto accidentally using it on a group of powerful female ninja who then become obsessed with him. This leads to all sorts of chaos as Naruto tries to figure out how to reverse the effects while also dealing with the newfound attention. And there are also fanfictions where the Harem Jutsu is enhanced by some magical or mysterious force, making it even more powerful and unpredictable.