Kirishima is still alive in the manga. The story doesn't have that plot point. Usually, character deaths are significant events and are clearly shown if they occur.
The reader could be a member of a rival group to Ayato's. At first, they are enemies, constantly trying to outdo each other. But during a common mission or task, they realize they have more in common than they thought. Ayato and the reader then have to navigate their new - found understanding while also dealing with the expectations of their respective groups.
In the manga, Ayato survives his encounters with Kaneki. The story doesn't have Ayato being killed by Kaneki. Their interactions are part of the complex plot but not resulting in Ayato's death.
Incorporate some unique elements. For instance, if there's a special event in the world of Ayato Kirishima, like a once - in - a - lifetime festival. Have the reader and Ayato attend it together. This gives you a chance to explore new aspects of their relationship. Also, add some humor. Maybe the reader tries to cook for Ayato but it turns out horribly, and Ayato's reaction can be both funny and endearing. This mix of different elements will make your fanfiction more engaging.
In the manga, Bakugo and Kirishima don't get together romantically. They have a strong friendship based on mutual respect and shared experiences in battles and training.
One possible analysis could be that their relationship in fanfic often showcases a strong bond of friendship. Bakugo's explosive personality and Kirishima's more stable and friendly nature create an interesting dynamic. Fanfic writers may explore how they support each other during battles or in their daily lives at school. For example, Kirishima might be the one to calm Bakugo down when he gets too riled up, and Bakugo could inspire Kirishima to be more confident in his abilities.