Toko is intellectually gifted, but she has problems in social behavior. It's been stated that she either never learned or never bothered to learn social skills. She even considers herself a gloomy outcast, often deciding to distance from others. Due to the constant bullying she faced as a child, Toko is highly suspicious of other people, frequently accusing them of thinking bad things about her. She expresses her opinions freely and extremely bluntly, which can come across mean and more than often rubbing people the wrong way, though she claims she is just being honest. Unlike Toko, Genocide Jack is very loud and outgoing. During Chihiro Fujisaki's murder trial she reveals everything about herself. She obsesses over Byakuya Togami, calling him "Master" in the English version. In the Japanese version, she uses honorifics in such as “-sama” which indicates that she has a submissive side -  as this honorific is used primarily in addressing people much higher in rank than oneself.

Voice Reference (Has Toko and  Genocide Jack):  https://www.youtube.com/watch?v=iQy35V_1rWc