Rize Kamishiro

Rize Kamishiro is one of ghouls in manga turned anime Tokyo Ghoul who posed as collage student who lured Ken Kaneki to eated him but before she eat him, she was killed accident by steal bars and her origins were transplanted to Kei by Dr.Kanou whose connection with ghouls and humans at Kanou General Hospital, Ken Kaneki, making him half-ghoul. She aperned in Kei's hallucination for taunted him about his deceased mother or not eaten his best friend Hideo it was revealed Rize was not her real name and possible took stolen identity from a person. She is Shuu Tsukiyama's acquaintance whom she worked with him before her death and Kei searched Rize's motives for kill.

Side story of manga it revealed her past before her death, Rize was always killing humans and ghouls and she put her kind face for her landlady who heard smell of stange is actaully Rize's victim. Banjou infomred the coffee cafe running by ghouls at 11th ward and ghoul invegstors track her down soon, Rize lured her neighbor Haysai and killed him, she met Haze and the gang before she fought and killed them and she informed Banjou that she was bored and leaving 11th ward searched her food.

Personally
Rize was well known cruel ghoul who eaten humans without remorse and pretend be shy to order get Kei as her food and used her charm as woman to seduce men and devours them.