One common theme is obsessive love. The yandere characters in these fanfictions are overly attached to their love interests. Another theme is possessiveness. They often want to keep their loved ones all to themselves. For example, a yandere character might try to isolate their love interest from friends and family.
In yandere x reader fanfics, yanderes usually display intense emotions. Their love for the reader is not the normal kind; it's more of an obsessive love. They may have a dual personality where they can be extremely sweet and loving one moment, but if they feel threatened in their relationship with the reader, they can turn very dangerous and menacing.
When writing yandere dev fanfiction, start with a strong concept. Consider what makes your story unique. Are you going to have a yandere who is also a supernatural being? Or a yandere in a historical setting? Next, plan your story structure. Have a clear beginning, middle, and end. In the beginning, introduce the characters and the situation. In the middle, build the tension as the yandere's actions become more extreme. And in the end, resolve the conflict, whether it's the yandere getting better or the love interest escaping. Also, read other yandere dev fanfictions for inspiration and to see how other writers handle the genre.
First, understand the RWBY universe well. Know the characters, their personalities, and the world they live in. For the yandere part, focus on creating a character with an obsessive love. Decide who they will be obsessed with among the RWBY cast. Then, plan out a plot that shows how this yandere character's actions affect the story. For example, they might try to isolate their love interest from the others.
Her relationship with her classmates would become strained. They might notice her odd behavior towards the person she's fixated on. For example, if she's constantly glaring at anyone who gets too close to that person, it would make others uncomfortable. Her friends might start to avoid her or try to talk to her about her behavior, but she won't listen as she's too consumed by her yandere feelings.
Yandere characters in these novels are often extremely possessive. They see the object of their affection as solely belonging to them. For example, they might get angry or even violent if someone else shows interest in their beloved.
One of the well - known yandere characters is Yuno Gasai from 'Future Diary'. She is extremely possessive of her love interest, Yukiteru Amano. Yuno is willing to do anything, including murdering others, to ensure that she is the only one in Yukiteru's life.
One popular 'My Hero Academia Yandere Fanfiction' is 'Obsession'. It delves deep into a yandere character's unhinged love for a hero student. Another is 'Twisted Devotion' which shows how a yandere's actions can disrupt the normalcy of the hero academy world. And 'Dark Affection' is also quite good, it has a unique take on the yandere trope within the My Hero Academia universe.