One common theme is loyalty. Gabriel's protectiveness shows his loyalty to Castiel. Another theme is sacrifice. Gabriel might be willing to sacrifice his own well - being or position to keep Castiel safe. For example, he could risk getting on the wrong side of other powerful angels.
The theme of redemption can also be present. Maybe Gabriel has some past actions he's not proud of, and by protecting Castiel, he's sort of making up for it. And of course, there's the overarching theme of the supernatural world they inhabit. The threats from demons, other angels, or even cosmic entities are what drive the need for Gabriel to be protective of a hurt Castiel. These fanfictions can really play with all these themes to create engaging stories.
I'm not sure of specific fanfiction titles off the top of my head. But you can also try fanfiction.net. Sometimes, fan communities on platforms like Tumblr might also recommend good fanfictions on this topic. You could post a request there, saying you're looking for fanfiction where Gabriel is protective of a hurt Castiel. They might direct you to some great reads.
A common theme is the exploration of Castiel's humanity. When he's being protective of the hurt Dean, he starts to understand human emotions like love, fear, and worry on a deeper level. This can lead to his own character development as he becomes more in tune with his human side while still maintaining his angelic essence.
One common theme is redemption. When Castiel is hurt, often the story will revolve around him finding a way to redeem himself, whether it's from a mistake he made that led to his pain or just from a sense of lost purpose. For example, in some fanfictions, he might have been hurt because he trusted the wrong entity and then has to make amends.
Family - like relationships are also prevalent. They are sometimes written as if they were brothers, with Gabriel taking on an older - brother - like role. He might teach baby Castiel about the world, about their angelic nature, and how to use their powers. There could be heartwarming scenes of them bonding over these things.
The theme of Castiel being tortured, either physically or mentally, is quite prevalent. It could be at the hands of demons or other angels. And then there's the aftermath of his hurt, like his struggle to regain his strength or his faith. Also, his relationship with Dean often takes center stage during his time of hurt, with themes of Dean's protectiveness and Castiel's dependence on him.
One common theme is isolation. Castiel often feels alone in his pain, whether it's due to his otherworldly nature or the actions of those around him. Another theme is betrayal. He is frequently betrayed in these stories, which causes him deep emotional harm. For example, when his allies turn on him or when he is misled by false friends.
Family - like relationships are also common. They might be depicted as brothers or having a surrogate family. This could involve interactions with other characters like Sam and Dean who might take on a caretaker role. In some fics, they learn about love and protection within this family - like setting.
One common theme is loyalty. They are brothers after all, and many fanfics explore how they stay loyal to each other despite the odds. Another is family secrets. Since they are angels, there are often secrets within their family that the fanfics like to uncover. And of course, there's the theme of redemption, especially when one of them makes a mistake and the other helps in the redemption process.
One common theme is the strength of their relationship. Batman's over - protective nature towards Robin when he's hurt shows how much he cares. It's like a father - son or mentor - protege bond that is intensified by Robin's vulnerability.
One common theme is loyalty. The pack's unwavering loyalty to Stiles is often a central aspect. They will do anything to keep him safe.