Well, a Nishimiya x Ishida fanfiction often explores the relationship between these two characters. It could be about their friendship deepening into something more, like a romantic relationship. The fanfiction might focus on their interactions, how they understand each other's feelings, and the development of their bond over time.
In a fanfic, their relationship could also take a more romantic turn. Ishida, who has come a long way from his bullying days, might start to see Nishimiya in a new light. He could realize his true feelings for her as they spend more time together, perhaps helping each other with their personal growth and insecurities.
Love and acceptance is also a prevalent theme. Nishimiya and Ishida might come from different backgrounds or have different ways of dealing with things. The fanfiction could explore how they learn to love and accept each other's differences, creating a strong and loving relationship.
A very common theme is redemption. In some fanfictions, Ishida might be on a path of redeeming himself for past actions, and Nishimiya is there to support him. Also, the theme of hope is prevalent. Their relationship gives hope, and fanfictions often expand on how they can be a symbol of hope for others around them in different scenarios.
One popular ishida x nishimiya fanfiction is 'A New Beginning'. It delves into their relationship post - canon events and shows how they grow closer in a new setting. Another great one is 'Shared Moments' which focuses on the small, tender moments between them that were not explored much in the original work.
A fanfic plot could also be about Nishimiya's dreams and how Ishida helps her achieve them. Maybe she wants to be an artist, and Ishida uses his own skills and connections to help her. In the process, they get closer and their relationship blossoms into something more than just friendship.