Kazuki Ferrari is one of the three Ferrari sisters in the anime series Galilei Donna. She is the middle sister and often acts as the mediator between her older and younger siblings. Kazuki is portrayed as a serious and responsible individual, with a strong sense of justice and leadership qualities. Her role in the series involves helping her sisters uncover the mystery behind the legacy of Galileo Galilei, their ancestor, while they evade capture from various antagonistic forces. Throughout their journey, Kazuki's logical thinking and bravery prove vital in overcoming challenges.