Yandere

Yandere (ヤンデレ): They have two sides to their personality.First, they love someone they love normally  and then they love extremely. Finally, they became a stalker and psycho.

Yanderes are extremely sweet, caring and gentle to those they love very much. However, they are usually mentally unstable, causing them to show their affection often through violence.

Male and Female can be YANDERE. Normally, Female can be yandere easier than male.

YANDERE IS THE MOST ANIME'S PERSONALITY THAT I LIKE
(I don't know why I like but I like it 5555)

FOR THE EXAMPLE:

Gasai Yuno ( Mirai NIkki)>> QUEEN of YANDERE

Her normal face

 YANDERE!!!

Natalia Arlovskaya ( Axis Power Hetalia)

Her normal face!!

Yandere ( only His brother, Russia or Elvan) !!!

Ryugu Rena ( Higurashi no naku Koro Ni)

Her normal face

YANDERE!!!

Lucy, Kaede or Nyu ( Elfen lied)

Kaede( when she was young)

Nyu

Lucy

Toma(  Amnesia)