Domo lives in a cave with Mr. Usaji, known in Japanese-language versions as , a portmanteau of the words , (rabbit), and (old man, grandpa). Mr. Usaji is a wise old rabbit who has lived in a cave for decades, loves to watch television and drink astringent green tea. Mr. Usaji is not into any "new" materials, and does not own a telephone. In terms of fashion, Mr. Usaji focuses on materials instead of shapes. Mr. Usaji's favorite food is carrots, and his least favorite food is "something that is meaningless."