One common theme is vulnerability. Castiel's broken wing makes him physically and often emotionally vulnerable, which is explored in many of these fanfics.
Recovery is also a big theme. These fanfics usually detail how Castiel heals his broken wing, both in a literal sense with medical or magical means, and in a metaphorical sense, as he heals his inner self. It can involve him learning to trust others more, or finding new ways to use his remaining abilities while his wing is broken.
Well, 'Among the Broken Wings' is a great one too. It tells a story where Castiel's broken wing situation leads him to discover new aspects of himself and his powers. It's a really interesting read with a unique take on the concept.
One common theme is protection. Castiel's wings often symbolize protection, and in these fanfictions, they might protect the reader from various threats in the Supernatural world.
The theme of discovery is also prevalent. The OC often discovers the existence and significance of Castiel's wings, which can be a journey of self - discovery for both characters. It might also lead to the discovery of new aspects of the Supernatural world they inhabit, like hidden places or powers that are related to the wings.
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.
I'm not sure specifically what 'castiel broken fanfic' is about without reading it. It could be a fan - created story that focuses on a character named Castiel and perhaps some sort of broken or damaged state, like his broken spirit, broken relationships, or a broken situation he's in within the fanfic's universe.
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.