One great aspect of Blue Exorcist Rin and Yukio fanfiction is the exploration of their brotherly bond. Writers often delve into how they support each other through their difficult exorcist training and the challenges of their unique heritage. For example, in some fanfictions, they might have to face a particularly powerful demon together, and through this, their relationship deepens as they rely on each other's strengths.
In fanfiction, Rin and Yukio's relationship can be portrayed in various ways. Some writers may focus on the conflict that arises from their different approaches to exorcism. Rin is more impulsive while Yukio is methodical. This can lead to interesting arguments and reconciliations within the stories.
One common theme is the relationship development between them. Writers often explore how their initial interactions, which might be a bit rocky or professional, turn into something more romantic or at least a deep emotional connection.
You can start by looking on fanfiction platforms like Archive of Our Own (AO3). It has a large collection of Blue Exorcist fanfictions. Just search for 'Yukio x Shura' in the search bar, and you'll be presented with a variety of stories written by different authors.