One common theme is the idea of an unlikely bond. Since the predator is often depicted as a fearsome and alien being, the development of a relationship with a human reader is quite unexpected.
Survival is also a big theme. In many of these fanfictions, the reader and the predator must survive in a harsh and unforgiving environment together. This could involve fending off other dangerous creatures or dealing with the elements. The relationship between the two is then strengthened through these shared experiences.
A common theme is the discovery of their mate bond. It often starts with an unexpected encounter or a strange feeling that draws Crowley and the reader together. Another theme is the protection aspect. Crowley, being a powerful character, will do anything to protect his reader - mate from harm.
A sense of danger is also a common theme. Slenderman is often associated with fear and threat in his original lore. In these fanfictions, the reader is usually in a situation where they are both attracted to and a bit afraid of Slenderman. It adds an element of excitement and tension to the story. For example, in many stories, the reader might be in a spooky forest where Slenderman lurks, and they have to navigate their relationship while also being in a potentially dangerous environment.
A third common theme is transformation. The male reader may experience a change in his perception of the world or himself due to his encounters with the female predator. This could be in terms of his courage, his view of other species, or his understanding of the concept of danger. These themes add depth to the fanfiction stories and make them more engaging for readers.
One common theme is the power struggle. In 'alien vs predator x reader fanfiction', there's often a fight for dominance between the aliens and predators, and the reader gets involved in some way. Also, the theme of adaptation is prevalent. The reader has to adapt to the harsh and strange environments created by these two species. For example, in many stories, the reader has to learn how to avoid the acidic blood of the aliens or the advanced hunting techniques of the predators. There's also the theme of friendship or alliance in some cases, where the reader forms an unlikely bond with either an alien or a predator against a common enemy.
Love and loyalty are big themes. The reader's love for the Volturi kings and their loyalty to them (or vice versa) is often explored. Also, the theme of destiny is common. Many of these fanfictions depict the reader as being fated to be the mate of the Volturi kings, and how they come to terms with this pre - determined path.
One common theme is survival. The male reader and the fem predator often find themselves in dangerous situations and have to work together to survive. For example, they might be stranded on an alien planet and need to rely on each other's skills.
There's also a story where the predator is on a hunt but instead finds a connection with the reader who becomes its mate. In these types of fanfictions, the cultural differences between the two are usually explored in depth, creating a really interesting dynamic.
One common theme is the allure of the supernatural. David being a vampire, there's the mystery and danger that comes with being involved with him. Another theme is transformation, both in terms of the reader perhaps being turned into a vampire and also in their personal growth as they enter this new relationship. And of course, love against all odds is a big theme, as the reader is getting involved with a vampire which is not exactly a normal or safe relationship.
Romance is also a big theme. Writers like to create a relationship between the reader and Darkiplier, which can range from a slow - burning attraction to a more intense love affair. There are also elements of danger and mystery in many of these fanfics. Darkiplier's nature as a somewhat menacing character brings in the danger aspect, and his complex backstory provides the mystery.
One common theme is survival. The OC often has to find ways to survive in a world dominated by the Predator. Another theme is the unexpected alliance. Sometimes the OC and the Predator end up working together.