Yandere
Yandere is a Japanese term for a person who is initially loving and gentle before their devotion becomes destructive in nature, often through violence. The term is derived from the words "yan", meaning a mental or emotional illness, and "dere dere", meaning to show affection. Yandere characters are mentally unstable, often using extreme violence as an outlet for their emotions. Often tagged along with Rape or Reverse Rape.
