In my view, 'bracket fiction' could also be something specific to a certain literary movement or group of writers. It might be a way to play with the traditional format of fiction. The use of brackets could be a device to create a sense of fragmentation or to juxtapose different ideas or voices. For instance, a writer could use brackets to insert historical facts or cultural references within a fictional narrative, adding depth and context to the story.
A simple fanfic could be about Reg and Nat sharing a quiet moment on the surface, away from the dangers of the Abyss. They could be talking about their dreams and fears, getting to know each other on a deeper level.
There may be some experimental short stories or self - published works that are examples of 'bracket fiction'. Maybe a story where the main character's dreams are presented in brackets within the regular narrative. So, as the story progresses, the bracketed parts about the dreams add a different layer of understanding to the character's waking life and actions. Another possibility could be a story that uses brackets to show alternative endings or different paths the story could take, making the reader more involved in the decision - making process of the narrative.
One great fanfic could be 'Reg and Riko's Adventure Beyond'. It beautifully captures their relationship as they explore deeper into the Abyss. The author does an amazing job of showing Reg's protective nature towards Riko.
There are many possible fanfics for Reg and Nat in the Made in Abyss world. Some might focus on their adventures together exploring the Abyss. For example, a fanfic could be about them facing a new and dangerous creature while on a quest to a deeper layer.
One common theme is friendship. Their bond in the original story is strong, and fanfictions often explore how that friendship could develop further. Another theme is adventure, as they are both characters associated with exploring the Abyss.