Wannyaa, also known as Baumiao, is a babysitter pet from Planet Otto, who is entrusted to take care of Luu, and is a cat-like alien who can transform into all sorts of human beings, often a blond-haired man (dubbed Mitarashi Dango) who was actually once the subject of Mikan's affection, and all forms of animals and objects. He develops a passionate liking for dumplings, and often writes about the events of the progressing day in his computerized nanny diary. Wannyaa often does all the cooking and cleaning in the house.