One common theme is the combination of their hunting/slaying skills. Since both are used to fighting the supernatural, fanfics often explore how they work together to take on bigger threats.
The theme of facing new and unknown supernatural forces also pops up a lot. Buffy and Dean are usually thrown into situations where they have to figure out a new type of evil or mystery. This allows for a lot of creativity in the fanfics as authors can come up with all sorts of new creatures and plot twists.
Another theme is the relationship between them. Whether it's a romantic relationship or a strong friendship, many Buffy x Dean fanfics focus on how they interact and grow closer. They come from different backgrounds in the supernatural world, so their relationship development is always interesting to read about.
Another theme is the idea of partnership. Fanfics often explore how Buffy and Dean can work together. Given their skills - Buffy's slayer strength and agility, and Dean's hunting knowledge and weaponry expertise - they make a great team. And stories show how they combine their strengths to take on bigger threats.
A common theme is the crossover of their two worlds. Since they both deal with the supernatural, fanfictions often explore how the Buffyverse and the Supernatural world can interact. Another theme is the building of a partnership. Given their skills in fighting evil, they usually end up working together in these stories.
One of the main themes is the exploration of power. As Slayers, they both have power, and fanfics often deal with how they handle it, whether they compete or collaborate. Also, self - discovery is a big theme. They both are on a journey to figure out who they are, especially in relation to each other. For example, Faith might be trying to find out if she can be more like Buffy in some good ways, and Buffy might be learning from Faith's more reckless nature at times. It's a complex interplay of identities.
A common theme is self - discovery. The oc often has to figure out their place in the Buffy - filled world, which is full of danger and magic. Another theme is friendship. They form bonds with Buffy and the Scooby Gang, learning to trust and rely on each other.
One common theme is the exploration of an unexpected relationship. Since Buffy and Marty are from different 'worlds' in a sense, their relationship is full of surprises.
One common theme is the exploration of their deep friendship that could be something more. Many fics play around with the idea of unspoken feelings between them. Another theme is their shared experiences in fighting the supernatural. They face all kinds of monsters together, and this often forms the backdrop of the story. Also, the theme of sacrifice is quite common, as they are always willing to sacrifice for each other in these fics.
The theme of sacrifice is also prevalent. Since they are hunters, they are often put in situations where they have to sacrifice something for the other's well - being. This could be their own safety, a chance at a normal life, or even a relationship with someone else.
One common theme is sacrifice. They often sacrifice for each other in these fanfics, like Castiel giving up his grace or Dean putting himself in danger to save Castiel. Another is the exploration of their unspoken feelings. Since they don't always express their emotions openly in the show, fanfics love to dig into that.
One common theme is loyalty. Castiel is often depicted as extremely loyal to Dean, and this loyalty is tested in various ways in the fanfics. Another theme is sacrifice. They are willing to sacrifice for each other. For example, in many stories, Castiel might sacrifice his angelic powers for Dean.
Family is also a big theme. They are brothers, but their relationship is more than just a typical family bond. Fanfics may show how their family ties are tested and strengthened. For example, they might face a situation where they have to choose between family and the greater good, but they always find a way to stay together as a family.