One possible theme could be their rivalry. They are known for their friendly competition in the Naruto series. Fanfiction could explore how this rivalry started, how it evolved over time, and how it made them both better shinobi.
A theme could also be their growth as individuals. How their interactions with each other have contributed to their personal development. For example, how Guy's positive attitude might have influenced Kakashi's more reserved personality and vice versa.
Well, family growth can be a theme. We could see Naruto's family evolving over time, learning new things together, and facing challenges as a unit. Also, the theme of family traditions, like certain ninja techniques or cultural practices that are passed down through the family generations in the Naruto world.
Friendship is also a great theme. The relationships between Harry and his teammates can be developed further. Maybe they have some inside jokes, or they help each other with schoolwork aside from Quidditch. These aspects can make for interesting fanfiction stories.
One theme could be the cultural exchange within the Naruto world. Shion comes from a particular background, and fanfics could explore how she shares her culture with Naruto and the others in the Hidden Leaf Village, and vice versa. Also, the theme of redemption or atonement could be relevant. If Shion has made mistakes in the past, fanfics could show her journey to make up for them. And of course, the theme of love in a non - inappropriate way. Not the 'lemon' type of love, but a more pure and emotional connection that she might develop with Naruto or other characters over time.
One possible plotline could be a story where a vampire is drawn to the unique chakra of Naruto. They initially see Naruto as a source of power but then come to respect him as a person and ally with him against other dark forces. Another could be a vampire who is exiled from their own kind and finds refuge in the Hidden Leaf Village, where Naruto helps them adjust to a new way of life and they in turn share their knowledge of the supernatural with Naruto.
Another theme could be their self - discovery through their interactions. Rei might start to understand her own emotions better because of Shinji, and Shinji could grow in confidence. In many fanfictions, they might also face challenges together, like dealing with the threats in their environment or the expectations placed on them by others. This can create a strong bond between them that is explored in the story.
Well, one common theme could be the power of female Arceus. It might explore how she uses her unique abilities to shape the Pokemon world. Another theme could be her relationships with other important Pokemon characters, like how she interacts with them and influences their actions.
A possible plotline could be their friendship development. They might start as acquaintances in the ninja academy and gradually become close friends as they train together and face challenges. For example, they could team up for a difficult mission and learn to trust and rely on each other.
Perhaps they are both part of the same gang. Sasuke is the tough enforcer while Sakura is the brains behind the operations. They get into various scrapes with other gangs. For example, they have to protect their territory from invaders. Along the way, they develop a deep friendship or even a romantic relationship based on mutual respect and admiration for each other's capabilities.
A common theme can also be the exploration of their shared heritage. Since they are related, there might be fanfictions that focus on the family secrets or unique ninja techniques that are passed down from her father to Naruko. This not only deepens their relationship but also adds an element of mystery and intrigue to the story.
One possible plotline could be a friendship that develops between them. They start off as enemies but gradually come to understand each other's perspectives. For example, they might realize they both have a deep love for their respective families in different ways.