Transformation is another theme. The reader might change as a result of their encounter with the demon, perhaps becoming more confident or more in touch with their darker side. Similarly, the demon might also transform, maybe becoming more human - like in their emotions or actions. These themes add depth and complexity to the demon x reader fanfiction.
The theme of redemption can also be found. Sometimes the demon in the fanfiction is on a path to redemption because of the influence of the reader. It gives the story a deeper meaning. Also, there's the theme of mystery. Demons are mysterious by nature, and the fanfiction often plays on that, with the reader trying to figure out the demon's true motives and nature as the story progresses. This keeps the readers hooked.
One common theme is the clash of different natures. The lost boys are, well, lost in a way, and the demon reader has their own set of powers and characteristics that are often at odds with the boys. Another theme is the idea of redemption. Sometimes the demon reader might be on a path to find redemption through their interactions with the lost boys.
One common theme is the exploration of different demon cultures. Since Sesshomaru is a powerful demon and the reader is a dog demon, their different backgrounds often play a big role. For example, how their clans' traditions might clash or complement each other.
A sense of belonging is another big theme. The reader, who may feel like an outsider in the real world, finds a place where they belong among the mutants. There are also themes related to fighting for justice, just like the X - Men do in the original stories.
One common theme is adventure. Since Chekov is part of the Star Trek universe, many fanfictions involve the reader going on adventures with him through space, exploring new planets and facing various challenges.
Love and sacrifice are also very common. The reader might fall in love with Vergil and be willing to sacrifice for him, or vice versa. In some fanfictions, there is also the theme of discovery. The reader discovers new sides of Vergil that no one else has seen, which deepens their relationship.
One common theme is adventure. Since boboiboy is often involved in battles and saving the world, the reader character gets to be part of those exciting adventures in the fanfiction.
One common theme is growth. Both Armin and the reader often grow as individuals while their relationship also evolves. For example, they might learn to be braver in the face of danger.
One common theme is friendship. Since Fluttershy is a character known for her gentle and friendly nature, many fanfictions focus on building a strong friendship between her and the reader. Another theme is personal growth. The reader often helps Fluttershy overcome her shyness, and in the process, both characters grow.
A common theme is the exploration of Nico's character. Fanfiction writers often dig deep into Nico's personality, his insecurities, his strengths. And the reader character is usually the catalyst for this exploration. Another theme is the power of connection. Whether it's a romantic or platonic connection, it's shown to be very powerful. For instance, in some fanfictions, the connection between Nico and the reader is what saves them from a dangerous situation.
One common theme is the discovery of the supernatural. Since Amaimon is a supernatural being, the reader often discovers his world and all its strange and wonderful aspects. For example, in many stories, the reader might learn about different magical powers or otherworldly places.