Yuri is a yandere in "Doki Doki Literature Club!".
Background
It's implied that, like Monika, Yuri suffers from Borderline Personality Disorder (BPD for short). She has a hobby of cutting herself even when at school. If you choose her place in the first act, she will be wearing sweater, implying that she may be hiding scars in her arms from cutting herself. She is said to be very crazy around your character (yandere).
During act three, Monika gives a piece of dialogue confirming that Yuri was, indeed, a yandere.
Yandere Traits
Yuri is obsessed with the player. When she spends time with the player in the second act, she becomes angry with him. She also spills some blood on poems. (She becomes mean towards her friends if she feels like they're trying to take the player away from her. At one point, she calls Monika out on being jealous of the player being with Yuri and "politely" suggests that she l herself. After she forces Natsuki and Monika out of the room, she confesses her love towards the player and acts obsessive while explaining her confession. No matter what player chooses, Yuri happily stabs herself out of excitement or rejection three times, then bleeds out and dies on the ground. She even tells the player that Natsuki is a obnoxious brat and says that no one will miss her if she kills herself. lol dead
