One common theme is the combination of magic and hunting. In these fanfics, the magic from the Harry Potter world and the hunting skills of the Winchesters are often merged. For example, they might use spells to track down monsters that the Winchesters usually hunt.
A common theme is the clash and combination of different worlds. Harry's magical world with spells and potions meets the Winchester's world full of demons and angels. Another theme could be the idea of family. Both Harry, who has his own complex family history in the Potter series, and the Winchesters, with their strong brotherly bond, might explore family relationships in new ways in these fanfics.
Another theme is friendship. Fanfictions might show how Dean forms new friendships in the Harry Potter world, like with Hermione and Ron, and how his friendship with Harry is based on their shared experiences of facing danger. It's about different characters coming together and relying on each other, despite their different origins.
One common theme is protection. The cat often protects the Winchesters in some way, whether it's from physical harm like a demon attack or from more emotional harm by providing comfort during tough times. Another theme is mystery. Since the cat usually has some sort of special ability, it adds an element of mystery to the story as the Winchesters try to figure out what the cat is and how it can help.
One common theme is family. Dean is all about family, whether it's his biological family or his found family like Sam and Castiel. Fanfics often explore the bonds, the sacrifices, and the love within the family dynamic.
I'm not entirely sure as I haven't read this specific fanfic. But generally, it might combine the world of Harry Potter where he is abused in some way with elements related to the Winchesters. Maybe it has crossovers in terms of character traits or story arcs from both universes.
Family is a very common theme. Since Dean comes from a complex family situation, fanfics often explore his relationship with his father and brother at a young age.
The struggle between good and evil is also a common theme. The angel represents the celestial good, while Dean has his own complex moral code. How they navigate the situations where good and evil are not so clearly defined is an interesting aspect that many fanfics play with.
One common theme is revenge. When Dean is angry, he often seeks revenge on those who have wronged him or his family. Another theme is protection. His anger can be a result of his strong desire to protect Sam or other friends. And self - blame is also a theme. Sometimes his anger is directed inward because he feels he has failed in protecting someone.
One common theme is self - discovery. Since it's a fem version of the character, often the story focuses on her finding out who she is in a world that may have different expectations of her compared to the male version. For example, in some fics, she has to navigate through male - dominated spaces and prove herself.
Harry would probably have a complex relationship with Sam and Dean. Since they are his half - brothers in this fanfic, there would be a sense of family loyalty. Dean might be a bit overprotective at first, seeing Harry as the younger brother he needs to keep safe. Sam, on the other hand, would likely be interested in Harry's magical knowledge and how it could be applied to their hunting.