Wannya

Wannya (also known as Baumiao, a play on "Bow-meow") is a cat-like alien "sitter pet" from Otto, entrusted to take care of Ruu. He can transform into a human being (his most common ones being a young blond man vaguely identified as Miyu’s relative and whom Mikan once liked, a dark-red-haired woman passed off as a housewife from the neighbourhood, or Hōshō), an animal or an object. He develops a passion for mitarashi dango (dumplings in sweet soy-based sauce), and writes about the day's events in his computerized "sitter pet" diary. Wannyā does all the cooking and cleaning in the house. He addresses Ruu as "Ruu-chama" (likely a portmanteau of chan, a term of endearment for children, and sama, a title denoting respect).