I'm not sure specifically what 'kagari death visual novel' is about as it could be a rather niche or indie work. It might involve a story centered around a character named Kagari and deal with themes of death, perhaps in a fictional or fantastical setting. But without more information, it's hard to say for certain.
Kagari's back story involves him being part of the Sibyl System's operations. He was created or conditioned in a way to serve within the system. He has a certain loyalty towards the system initially, but as the story progresses, his experiences start to change his perspective.
In some Pokemon Ayaka fanfiction, there could be other trainers that she meets on her journey. These trainers could be rivals, like a cocky trainer who always challenges Ayaka. Or they could be friends who join her on certain adventures. Also, there might be some Pokemon professors or experts in the story who give Ayaka advice on training and taking care of her Pokemon.
Most 'aether x ayaka fanfic' tend to be set in the richly detailed world of their original game. The stories might involve quests that they embark on together. Their relationship can range from being friends who support each other to having a more romantic undertone. For example, in some fanfics, they might share a special moment under a starlit sky while on a journey. This kind of setting and relationship development is quite characteristic of these fanfics.
One common theme is adventure. Since both Aether and Ayaka are part of the Genshin Impact world which is full of exploration. Writers often create stories where they go on adventures together, facing challenges and discovering new places.
One interesting Pokemon Ayaka fanfiction could be about Ayaka's journey to become a Pokemon master. She might start with a single Pokemon, like a Pikachu, and face various challenges and trainers along the way. Another could be a story where Ayaka discovers a rare and powerful Pokemon in an uncharted region.
The theme of friendship is also quite prevalent. Even if the fanfic doesn't focus on a romantic relationship, their friendship can be a strong element. They can support each other through difficult times, like when Aether is facing challenges in Inazuma and Ayaka offers her help. Or when Ayaka has to deal with political or family matters, Aether can be there as a true friend.
You can start by looking on platforms like Steam. Sometimes indie visual novels are available there. Also, check out some dedicated visual novel communities or forums. People there might be able to point you in the right direction. It could also be on the developer's official website if it's a relatively unknown or self - published work.