Defoko is the default voice for the program UTAU, originally named Utane Uta, meaning either "Default Child" or "Default Girl". Although Kasane Teto is more popular, more people know her as a tough voice to use in UTAU because of the fact that her voice is 100% artificial, made from the program AquesTalk. Her companions, Kasane Teto and Momo Momone, are usually featured in videos with Defoko. They are known as the "UTAU 3"
Defoko has such a wispy voice! It's wonderful!