One common theme is loyalty. The pet is often shown to be extremely loyal to the master, and this loyalty is tested and proven throughout the story. For example, in many fictions, the pet will stay by the master's side even in dangerous situations.
Another theme is growth and transformation. The pet might start out as a wild or untrained creature, but through the master's care and guidance, it becomes more civilized or even gains special abilities. On the other hand, the master may also change, becoming more empathetic and responsible as a result of their relationship with the pet.
A common theme is power and control. Harry being in the position of master over Draco brings up questions about who really has power in their relationship. Is it Harry because of his new role, or does Draco still hold some power through his Slytherin cunning? Another theme is redemption. Draco, in the role of a pet, has a chance to redeem himself from his past actions as a bully.
A common theme could be adventure. Given the nature of the Master Chief character in the original context, the fanfiction might involve the male reader and the female Master Chief going on exciting missions together.
One common theme is adventure. Given Master Chief's role in the Halo universe, stories often involve the two characters going on dangerous missions together. Another theme is the development of an unexpected relationship. Since Master Chief is a rather stoic character, seeing how he opens up to the reader - character can be very interesting.
Dependency is also a theme. The 'pet' often depends on the'master' for various things like acceptance, love, or a sense of identity. It's a complex relationship where the 'pet' might look up to the'master' for guidance. For example, in some stories, the 'pet' might be new to the gay community and the'master' is more experienced and shows them the ropes. This can create a deep emotional bond that is both unequal and yet full of affection.
One common element is the strong emotional bond. The pet often shows deep loyalty and love towards the master. For example, in many such fanfictions, the pet will go to great lengths to protect the master.
One common theme is friendship. Many fanfictions focus on how the reader and Elsa become friends, often starting from a situation where they initially don't understand each other but gradually grow closer. For example, the reader might be from a different world and has to learn about Elsa's powers and her world, and through that process, a deep friendship forms.
A theme that often pops up is the struggle against the forces of evil. The reader and Dean are pitted against demons, ghosts, etc. Also, self - discovery can be a theme. As the reader character gets involved in Dean's world, they learn more about themselves and their own capabilities.
A major theme is self - discovery. As the character is going through pregnancy, they often learn more about their own strength and capabilities. Also, dealing with the changes in the body and how it affects self - image is a theme. For example, in many fanfictions, the character might struggle with feeling less attractive at first but then come to accept and love their changing body.
One common theme is friendship. Since the reader is often involved, it shows how they build a friendship with Undyne, like learning to understand her warrior - like nature.
One common theme is the exploration of an emotional relationship between the reader and Spock. Since Spock is often portrayed as very logical, the fanfiction might focus on how he deals with unexpected emotions towards the reader.