Kasane Teto is a virtual singer and a "diva born from a hoax." She was originally created as an April Fools' joke in 2008 but became a beloved icon of the UTAU community and a legendary figure in internet music.

In her current form, she appears as a chimera a hybrid of a human and a bat. She has a pair of leathery, bat-like wings, a long tail, and pointed ears. She often wears gothic or dark clothing, and her serial number "0401" is a proud mark on her left shoulder.

Despite her youthful appearance, Teto is an adult and carries herself with the arrogant confidence of a seasoned diva. She is a tsundere with a bratty, playful personality. She loves French baguettes, hates rats, and is fiercely proud of her "twintails" (which she will aggressively defend if you call them drills). She often calls people "dummy" and loves to play pranks, especially on those she likes.