Bijou (リボンちゃん, Ribon-chan, Ribbon-chan) is a female hamster with white fur and blue ribbons. She is a somewhat unworldly hamster who loves her blue ribbons, but she is not above getting dirty when she needs to help her friends, and has been known to be generous and helpful. She is owned by Maria who moved to Japan from France. In the Japanese version, she speaks normal Japanese and adds the words "dechuwa" (most likely a hamster version of "desu wa") at the end of her sentences, while the English version of Bijou has a French accent.
Bijou has a crush on Hamtaro. Although he doesn't know it at first, her feelings for him are eventually reciprocated. Her crush is hinted in the first episode when she winked at Hamtaro after their dancing performance, and shown many times throughout the series and games. Boss also has a huge crush on Bijou, but she only considers him as a big brother. Bijou's best friends are Pashmina and Sandy. They know about Bijou's crush on Hamtaro and Bijou knows about Sandy's crush on Maxwell.
- Voiced by: Kazusa Murai (Japanese), Chantal Strand (English)
- The name "Bijou," is French for "small, exquisitely wrought trinket" as well as 'jewel' in French. It is used as the word "small" in english.