Shinobu Mitsuba, also known as Shinobu-chan, is one of the main characters in the anime series 'Ninja Hattori-kun.' She is a friendly and skilled ninja who lives with the Mitsuba family. Shinobu is known for her cheerful demeanor and her unwavering loyalty to her friends, especially Kenichi, the protagonist. She often assists in solving problems, using her ninja skills to help Kenichi in his daily life. Shinobu's presence adds a dynamic and lighthearted element to the series as she navigates the challenges of being a young ninja in modern society.