Yuri is a possible yandere in Doki Doki Literature Club.
Background
It's implied that, like Sayori, Yuri suffers from borderline personality disorder (BPD). She has a habit of cutting herself even when at school. If you choose her place in the first act, she will be wearing a sweater, implying that she may be hiding scars on her arms. She has been writing for a long time, making her one of the more experienced club members.
Yandere Traits
Yuri is obsessed with the player character. When she spends time with the player character in the second act, she becomes infatuated with him. Things intensify when she starts stealing his personal items and smearing blood over her poems so that it's "covered in her scent". She becomes quite hostile towards her friends if she feels like they're trying to take the player character away from her. At one point, she accuses Monika of being jealous of the player character being with Yuri and suggests that she kill herself. After she forces Natsuki and Monika out of the room, she confesses her obsessive love to the player character and asks if he accepts her confession. No matter what the player chooses, Yuri will stab herself to death.
