What is Yandere?

Yandere is a character archetype describing someone whose love becomes dangerously obsessive. The term combines 'yanderu' (sick/mentally ill) and 'deredere' (lovey-dovey). Yandere characters appear sweet and affectionate but can turn violent or possessive when their love interest is threatened. Famous yandere characters include Yuno Gasai from Future Diary. In hentai, yandere scenarios often involve intense possessive dynamics.