In Castiel and Meg fanfic, a prevalent theme is the exploration of free will. Both characters are somewhat bound by their angelic and demonic natures, but their relationship can be a journey of breaking free. Another theme is the power of connection. Their connection, despite being from different realms, has the power to change their destinies. Also, the theme of transformation is common, as they change and grow through their interactions with each other.
One common theme is the struggle between good and evil. Castiel is an angel, and Meg is a demon, so there's always that conflict. Another theme is redemption. Meg might be seen as someone who could be redeemed through her relationship with Castiel. And of course, love is a major theme. Their relationship, which is so unexpected, often leads to stories of love conquering differences.
One common theme is Castiel's struggle with his angelic nature. He often has to balance his loyalty to heaven and his newfound connections with humans.
Another popular theme is the power struggle between them. Meg is a powerful demon and Castiel is an angel with his own set of powers. Fanfictions sometimes focus on how they use their powers against each other, or in some cases, how they learn to combine their powers for a common goal, which makes for some really exciting action - packed stories.
Another theme is self - loathing. In 'castiel depressed fanfic', he frequently blames himself for things that have happened, whether it's his actions in battles or his perceived failures in protecting others. This self - loathing is a big part of his depressive state.
The theme of self - discovery is also prevalent. As a female Castiel, she has to figure out her place in the world, both as an angel and as a female entity. This often involves her coming to terms with her new identity, learning about her powers in a different context, and finding her role in the fight against evil in a more female - centric way.
Reflection is also a big theme. Castiel has a long history, and on his birthday, he may look back on all the things he has been through, the people he has met, and the choices he has made. This can add a lot of depth to the fanfic and make readers understand his character better.
The theme of sacrifice also pops up a lot. Castiel may have to sacrifice his angelic duties or powers for his wife, or the wife might sacrifice her own safety or desires for Castiel. This creates a sense of drama and emotional depth in the stories. For instance, in one fanfic, the wife gives up her chance at a normal life to stay with Castiel in the dangerous world of angels and demons.
There can be a theme of spiritual discovery as well. In some fanfics, his blindness is seen as a way to connect more deeply with the spiritual realm. It can be a way to show that there are other ways to 'see' beyond physical sight, and it adds a really interesting layer to his character.
A common theme is the power struggle. Castiel is often seen as a more 'pure' angel, while Lucifer is the rebellious one. Their interactions are filled with this underlying battle for dominance or influence. Another theme is redemption. Sometimes Lucifer is portrayed as having a chance at redemption, with Castiel being a key factor in that.
The theme of protection is often present. Castiel, being an angel, has a natural inclination to protect. So in these fanfics, he not only babysits but also safeguards the children from various threats, whether they be physical or more supernatural in nature. For example, in some fics, he might protect the kids from demons while trying to make them eat their vegetables at the same time.
Another theme is growth. In these fanfics, Castiel usually grows as a character. He might learn about human values like love, friendship, and loyalty in a more intimate way since he's part of a family. For instance, he could start to understand the concept of a family dinner and the significance of sharing time with loved ones.