A significant theme is adaptation. Sirius has to adapt to a world that has changed since he was last this young. He may have to learn new magic, new social norms, and new ways of interacting with others. This theme of adaptation can lead to many interesting plotlines as he tries to fit into this new - yet - old - to - him world.
One common theme is the idea of second chances. Since he's deaged, Sirius gets to relive parts of his life. Another theme could be self - discovery. He has to figure out who he is again in this new younger form.
One common theme is the idea of second chances. With Harry deaged, Sirius gets a chance to be a better guardian or mentor, sort of like a redo of their relationship. For example, in many stories, Sirius is able to prevent some of the traumas Harry faced in the original story.
One popular idea in such fanfiction could be Sirius Black being deaged and having to adapt to the modern wizarding world. He might struggle with new spells and technology while still having his old memories.
The theme of freedom is quite important too. Sirius was locked up in Azkaban for a long time, and when he escaped, he was fighting for his freedom. Fanfictions often expand on this, showing his journey to fully regain his freedom and his place in the wizarding world, while also dealing with the prejudice against him because of his supposed crimes.
Well, a frequent theme is perhaps the sense of betrayal. In the original story, there were elements of betrayal he faced, and in this type of fanfiction, it could be magnified to the point where he feels there's no way out but suicide. Also, the theme of broken dreams might be there. He had dreams of a normal life, of clearing his name, and if those seem completely out of reach in the fanfiction, it could lead to thoughts of self - destruction.
One common theme could be the exploration of Sirius Black's complex character in a dark context. It might show how his past traumas could potentially lead to actions that seem like abuse, even if not in a traditional sense. Another theme could be the impact of such actions on other characters in the fanfiction universe.
Often, in Sirius Black bashing fanfiction, his loyalty might be questioned. Writers may create scenarios where it seems like he's not as committed to his friends as he should be. They might twist his relationship with James Potter, showing him as being jealous or having ulterior motives. Also, his time in Azkaban could be used against him, making it seem like he was more of a criminal than a wrongfully - imprisoned man.
One common theme is their relationship as brothers. Many fics explore the complex dynamic between them, from their early days in the Black family to their diverging paths. For example, some stories focus on how Sirius's rebellious nature clashed with Regulus's initial loyalty to the family.
The theme of redemption also shows up. Since Sirius had a somewhat 'tainted' reputation in the eyes of the Black family, some fanfictions explore if Orion could have played a role in his redemption or if Sirius could have redeemed the family name in Orion's eyes.
One common theme is the vulnerability of Sirius. Usually, he's portrayed as this strong, brave character, but when sick, he shows a different side. Another theme is the support from his friends and family. They often rally around him, highlighting the importance of those relationships.
One common theme is family conflict. Sirius rebels against the pure - blood mania and dark magic - associated ways of the Black family that Walburga represents. Another theme is the struggle for identity. Sirius is trying to be his own person away from the expectations set by his family with Walburga as a symbol of those family constraints.