The main characters are Naruto and the 'ruler'. The 'ruler' could be a half - human, half - something - else entity. There might also be some minor characters from the Naruto series who are just passing through the ruler's domain. For example, Kakashi could make a cameo appearance. He might give Naruto some advice regarding his relationship with the ruler. And there could be some original characters in the ruler's court, like a court jester who provides some comic relief while Naruto is trying to navigate his relationship with the ruler.
Obviously Naruto would be one of the main characters. For the 'ruler' character, it could be someone new created specifically for the fanfiction. It might be a powerful female or male ruler with unique abilities and a strong personality. There could also be side characters from the Naruto universe like Sasuke or Sakura who might play a role in Naruto's interactions with the ruler.
In some fanfictions, there could be an original character within the Hyuuga clan. This character could be someone who has a unique ability or perspective that draws Naruto's attention. For example, a young Hyuuga who has a different view on the clan's strict hierarchy and teams up with Naruto to bring about some changes within the clan while also facing external threats.
One possible plot could be that the 'ruler' has a power that Naruto needs to defeat a greater evil. In the process of trying to get that power, they get involved in a complex relationship. The 'lemon' aspect could be the added element of a budding romance that is full of challenges and emotions. For example, the ruler might have a set of rules that Naruto has to follow, and his struggle with those rules while falling for the ruler could be the main story.
Most likely Naruto himself would be one of the main characters. He's the titular character of Naruto. And probably some of his close friends like Sasuke and Sakura. From High School of the Dead, it could be Takashi Komuro.
One likely main character could be Hermione. Since she's open to new ideas and is always looking to improve things, she might be the one to embrace the Lilly Lemon concept. She could be the bridge between the two worlds, using Lilly Lemon - like ideas to make Hogwarts a better place.
Obviously Naruto would be one of the main characters. And among the Hollow harem, there might be some well - known Hollow characters like Orihime Inoue (who has Hollow - like powers in the original series) or other original Hollow characters created specifically for the fanfiction.
Another possible pairing could be Sasuke and Elsa. Sasuke has his own dark past and a brooding personality. Elsa also has her own internal struggles with her powers. They could bond over their shared experiences of having to control something within themselves that others might fear. And their cool and somewhat aloof demeanors could make for an interesting dynamic.
Well, Naruto and Tsunami are the core. But don't forget about Shikamaru. He's a smart character and if added to the harem in some creative way, it could lead to some really interesting stories. Also, Kiba might be included. His energetic and somewhat brash personality could add a lot of humor and conflict to the relationships in the harem. And of course, there could be other minor characters from the Naruto world who could be brought in to spice things up.
The main characters are Naruto and Kushina. Given that it's about Kushina inside the seal within Naruto, their relationship and interactions would be at the heart of the story. It's possible that other characters from the Naruto universe could play supporting roles. For example, the Nine - Tails might also be important as it is also associated with the seal. But overall, Naruto and Kushina are the key figures in this fanfiction.
Most likely Naruto will be the central character. Alongside him, we can expect to see his usual companions. Sakura could be there, perhaps providing some medical support or getting involved in a beach - related mystery. Sasuke might be there too, either as a friend or with some ulterior motives. And Kakashi could be there to guide the young ninjas, especially if there are any dangerous situations or training opportunities on the beach.
Sasuke and Magneto. Both are complex characters with a bit of a dark side. They could either become enemies as their goals might clash. Sasuke is on a journey to gain power for revenge, and Magneto wants to protect mutants but sometimes uses extreme methods. Or they could form an unlikely alliance, learning from each other's determination and power - seeking motives.