One common theme is the power dynamic. Usually, the devil has a certain amount of power, and the reader has to deal with that. Another theme is temptation, as the devil often tempts the reader in different ways, like with power, wealth, or knowledge.
In these types of fanfictions, a prevalent theme is the allure of the unknown. The devil represents something mysterious and dangerous, and the reader is drawn to that. Transformation is another theme. The reader may change as a result of their interactions with the devil, either becoming stronger, more corrupted, or finding a new sense of self. And of course, there's the theme of the supernatural world that the devil inhabits and drags the reader into.
Power and control are common themes. Vergil is a character associated with power, and in the fanfiction, his relationship with the reader might involve him either trying to protect the reader from the dangerous world of 'Devil May Cry 5' or teaching the reader how to gain power themselves. For example, he could be showing the reader how to master devil arms.
One common theme is redemption. The reader may play a role in Vergil's journey towards redemption, helping him overcome his darker tendencies. Another theme is power dynamics, as Vergil is a powerful character and the relationship with the reader can explore how they interact in terms of power, whether it's the reader learning from Vergil or challenging his authority.
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.