Shinobu is the younger daughter of Foreman Takeda and his wife, Mia. She is Mariko's younger sister. Because of her father's obsession with Mariko she became invisible to his eyes. She discovered her father's secret and decided to enter the Fast World and follow the W.I.T.C.H. girls. Shinobu was the one who found William in the Fast Realm. Later, Shinobu revealed that she has the magical ability to turn invisible, but it seems that she was unaware of her powers at the time.