[...] a "yandere" is a psychotic girl who's violent who has affections for a guy character mostly.
I believe the definition means a character (regardless of gender, but usually female) that alternates being sweetly affectionate and violently possessive towards another (regardless of gender). The yandere in question doesn't need to "just" kill the people who are trying (in their head or in the real world) to steal their beloved. Future Diary's Yuno tried to kill the object of her affections, for example.
last edited at Jul 6, 2015 9:34PM