Gen Urobuchi
Writer Gen Urobuchi stated that he had created Sayaka based on an "Urobuchi character". He referred to her as his favorite character in the series and said her story was the most enjoyable to write. She was designed by Ume Aoki; due to the character's tomboyish personality, Aoki wanted to express both boyish and girlish qualities to the character's design. Sayaka is voiced by Eri Kitamura in Japanese and Sarah Anne Williams in the English version of the series.