Sanae Uchida (née Susaki) is a Japanese sound designer and programmer who has worked for Nintendo since she was hired in 2004. She is more commonly known as the voice actress for Boo and Spike from the Super Mario franchise. Her other voice roles include the Miis from Wii Music. Her first notable works include Mario Kart DS and Wii Play.
I'm Uchida from EAD. I was in charge of sound programming and creation of sound effects. I, too, fought against a certain pressure, or the weight of tradition this time. (laughs)
-Uchida on the development of New Super Mario Bros. Wii