Another theme is the exploration of their differences. Shigaraki represents chaos and destruction while Deku represents hope and heroism. Fanfics usually explore how these two opposing forces interact and influence each other. For example, in some fanfics, they start to understand each other's perspectives better as they spend more time together.
One great 'Shigaraki x Deku' fanfic is 'Unlikely Bonds' which explores a unique friendship-turned-something -more between them. It delves deep into their complex characters and how they might interact in different scenarios outside of the main plotline.
To write their relationship realistically, you need to consider their personalities. Deku is kind - hearted and determined, while Shigaraki is more cynical and vengeful. So their interactions would be full of tension. For example, if they have an argument, Deku might try to reason with Shigaraki using his ideals, but Shigaraki would likely mock or reject them.
One interesting plot could be that Deku and Shigaraki, as brothers, are on opposite sides at first. But then they discover a common enemy that forces them to work together. This would involve a lot of character development as they have to overcome their differences. For example, Deku's belief in heroism and Shigaraki's hatred for the hero society.
A 'shigaraki x femkokkuri fanfic' might explore the relationship between the two characters. It could involve character development, their interactions in different scenarios. For example, it could show how they support each other during difficult times or how their personalities clash and then gradually find common ground. It might also introduce new plot elements based on the unique characteristics of Shigaraki and femkokkuri in the fanfic's universe.
One common theme is redemption. Both characters have a lot of darkness in their pasts, and in some fanfics, they find a way to redeem themselves through their relationship. For example, they might encourage each other to move away from their villainous ways.
One possible theme could be friendship. Despite their differences, Shigaraki and femkokkuri could form an unlikely friendship. Another theme might be self - discovery. Through their relationship, they may learn more about themselves.
Well, there's 'Fusion of Powers' in the 'dabi x shigaraki fanfic' genre. This one is cool because it imagines what would happen if they combined their powers. It's a very creative take on their relationship. And 'Unexpected Comrades' is also worth reading. It shows their journey from being just acquaintances to something more, with some really heart - touching moments.
You can try Archive of Our Own (AO3). It has a large collection of fanfics, including many 'dabi x shigaraki' ones. Just use the search function on the site.