Yuno Gasai from Mirai Nikki - Future Diary

A woman dressed in a purple schoolgirl outfit with a large red bow on her chest, holding a knife and covered in fake blood. The woman's long pink hair is styled in two braids that fall over her shoulders, and she wears a white apron over her dress. Her eyes are wide open, and she has a crazed look on her face. She holds the knife up to her mouth, as if preparing to bite it. The background of the image is blurred, but it appears to be a dark room or hallway. The overall atmosphere of the image is one of horror and violence, suggesting that this woman may be a character from a Japanese anime or manga series.