A more complex fanfiction could revolve around a shared goal between Naruto and Satsuki. For example, they both discover that there is an ancient evil that has been influencing events in both their universes for a long time. They have to put aside their differences (cultural and otherwise) and work together. Along the way, they might have some disagreements but ultimately grow to respect each other more as they fight side by side.
There are quite a few. One aspect that makes some of these fanfictions great is how they delve into the characters' inner thoughts and feelings towards each other. They might show Naruto's unwavering determination to win over Satsuki's heart, and Satsuki's gradual realization of her true feelings for Naruto through small, everyday interactions and big, life - changing events in the fan - created storylines.
Well, obviously Naruto and Satsuki are the main ones. But often, other characters like Sakura might be involved too. Since it's a harem - themed fanfiction, some writers might include characters like Hinata as well. Hinata's admiration for Naruto could be explored in a different way within the context of the harem. Also, characters like Kakashi could make an appearance, perhaps as a mentor figure to Naruto and the others in this alternate fan - created scenario.
One common theme is the overcoming of their initial rivalry. In the original story, they were sort of rivals, and in fanfiction, this often turns into a basis for their love to grow.
Good fanfiction also requires good dialogue. Try to capture the voices of the characters. Naruto might use more enthusiastic and simple language, while Satsuki could be more direct and to the point. Also, don't be afraid to add some original elements to the story. Maybe create new jutsus for Naruto or new weapons for Satsuki. This can make your fanfiction stand out. Additionally, pay attention to the pacing of the story. Don't rush through important events but also don't drag it out too long.
One interesting Naruto and Satsuki fanfiction could be where they team up early on to face a new threat in the Hidden Leaf. They might discover new jutsus together and their relationship grows stronger as they rely on each other's skills.
Satsuki could also be angry at first. Angry that Naruto would consider leaving her and the world in such a way. But this anger would quickly turn into determination. She would be determined to make Naruto see how much he means to her and to the people around him. So she would use her love as a weapon to fight against Naruto's dark thoughts, constantly showing him affection and positive affirmations.
A third scenario might involve a festival in the Hidden Leaf Village. Naruto and Satsuki, along with the other members of the harem, participate in the various activities at the festival. They could try different foods, play games, and there might be a moment where Naruto wins a big prize at a game and shares it with Satsuki and the others, strengthening their bonds within the harem.
You can try fanfiction websites like FanFiction.net or Archive of Our Own (AO3). These platforms have a large collection of Naruto - related fanfictions, and you can search specifically for those involving Naruto and Satsuki.