I want to write a yandere without them being cliche or annoying
How to write a yandere
take your own forms of jealousy and intensify them. make the obsessiveness settle at first. make them seem like a normal person but drop hints of them being a little off
group
https://www.notebook.ai/forum/characters-board/how-to-write-a-yandere
Maybe try reading through this other thread from a while back?