Hisoka in yandere fanfiction might also display a jealous streak. If he sees the reader interacting with someone else, he could become very agitated and might even start to plan ways to remove that person from the picture. His actions are often unpredictable and a bit on the crazy side, which is typical of a yandere character. For instance, he might give a chilling smile to the person who is talking to the reader, a warning sign of his impending wrath if they don't back off.
One interesting plot could be Hisoka becoming overly possessive when the reader starts getting close to another character. He might start to eliminate any potential threats in a very Hisoka - like, unpredictable way.
Hisoka fanfic often focuses on his unpredictable nature. Hisoka is a complex character, so many fanfics explore his motives and desires. For example, some fanfics might dig into why he is so obsessed with strong opponents.
Hisoka is still alive in the manga. The storylines haven't led to his death yet. Maybe there'll be developments in the future, but for now, he's kicking.
Hisoka's origin story involves his early days as a powerful and somewhat unhinged nen user. Key events include his discovery of his nen abilities and his growing fascination with strong opponents. He has always been on a quest to find and battle those who can give him a good fight, which led him to various parts of the world in search of worthy adversaries.