She is voiced by Marina Inoue in the Japanese version and Monica Rial in the English version, both of whom also voice Pheles.
Shisui has short brown hair and lavender eyes. As a result of her kidnapping by Kirito Kamui, she loses her right eye. During the time she works under Kamui, she wears a maroon leather outfit with red lipstick and a black eyepatch covering her empty eye socket.
Shisui is very much a 'by-the-book' kind of cop; like Shimotsuki, she strongly disapproves of Akane's tactics like letting two Enforcers go after a suspect without a supervising Inspector. However, she also carries significant inner animosity towards the Sibyl System and has quite a sense of inferiority due to her relatively high Crime Coefficient.
This gives her the incentive to help Kamui shut down the system and give her the freedom she sought from her society's repressions. Shisui is also shown to be ruthlessly bloodthirsty as she was the most willing to kill on Kamui's behalf.
So she showed no remorse in helping to coordinate the slaughter of dozens of Inspectors who used to be her colleagues. By the time the MWPSB confront her, she has become completely obsessed with Kamui as she believes he will truly clear the entire world of its color. It's unsure if this is because of the medicine, Kamui's words to her before, or just her own desires for him.