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 common theme is friendship. Often, the stories focus on how the reader becomes friends with Dean and Castiel. Another theme is adventure. Since they are hunters in the Supernatural world, they go on many adventures together with the reader. For instance, they might go on a quest to find a powerful artifact.
One common theme is redemption. In some stories, Dean Ambrose might be portrayed as having made some mistakes in his career or personal life, and the reader helps him find his way back. Another theme is friendship - turned - love. They start as friends, perhaps sharing a common love for wrestling or a mutual dislike for a certain heel in the WWE, and then it blossoms into a romantic relationship.
The theme of self - discovery is also present in some 'dean and reader fanfic'. The reader character, through their experiences with Dean, often discovers things about themselves. Maybe they find out they're braver than they thought, or they learn about their own family secrets. In a way, Dean becomes a catalyst for the reader's personal growth in these stories.
Love and protection. Dean is often portrayed as being very protective of the reader. For example, in many fics, he'll stand up to any threats that come their way.
One common theme is the struggle between the human and the divine. Dean represents the human side with his flaws and earthly desires, while Castiel is the angelic being. The reader is often caught in the middle, trying to understand and bridge this gap. For example, in many fics, the reader has to help Dean accept Castiel's otherworldly nature and vice versa.
Another theme is self - discovery. Through their relationship with Dean, the reader often discovers new things about themselves, like their own strength or the fact that they are worthy of love. Dean helps them see these things, which adds a deeper layer to the fluffiness of the story.
One common theme is protection. Dean is often portrayed as being extremely protective of his daughter, ready to face any danger to keep her safe.
One common theme is power dynamics. For example, Dean might be in a dominant role while the reader is submissive. Another theme could be adventure - they might be on a hunt and the kinky elements are incorporated into the dangerous situations they face.
Another common theme is adventure. They could go on a journey together, either inside Hogwarts where they discover secret passages or outside the school exploring the wizarding world. It gives the writers a chance to create new and exciting scenarios for them to experience.
The theme of isolation is also prevalent. As a vampire, Dean may be shunned by his old friends or hunted by other hunters. He has to deal with being alone in a world that he no longer fully belongs to. And sometimes, there's the theme of power. His new vampire powers can be both a curse and a way to protect those he loves.