Saki Asami

浅海 サキ

Saki is leader of the Pleiades Saints. She has a strict and cold personality, but is very nice and kind to those who she holds dear to. [Spoiler] She once had a littler sister, Miyuki, who always loved flowers and dreamed of getting married. However, Saki and Miyuki were in a car accident and Saki was the only survivor. Saki went into depression was about to commit suicide until she was saved by Michiru. To become a Mahou Shoujo, Saki wished that her sister's flower would bloom forever. [/Spoiler] [Spoiler] Saki always loved Michiru. Therefore she could never kill Kazumi, as she holds the same face as her. In the final battle Nico placed a grief seed in her which turned Saki into a witch, in which she destroyed herself. [/Spoiler] (Source: Puella Magi Wiki)