There are some authors who are known for their creative plotlines in Horimiya fanfiction. They might take the basic relationship of Hori and Miyamura and add a lot of interesting twists and turns. These authors usually have a good understanding of the anime's world and can create believable scenarios that fit right in. Another group of great authors are those who can write really heartwarming and fluffy stories that just make you feel good when you read them.
There are Horimiya fanfictions with plots centered around school events that didn't happen in the original story. For instance, a big school festival where Hori and Miyamura are in charge of different parts but end up working together closely. It could also be a plot where they have to deal with a new transfer student who has an impact on their relationship, either trying to break them up or actually bringing them closer in an unexpected way.