Bijou, known in the original Japanese as Nabiyu, is a character from the anime Princession Orchestra who takes the form of a small, rabbit-like fairy residing in the land of Alicepia. In this role, Bijou is primarily responsible for guiding and supporting the series' central heroines, the Princesses, serving as their advisor and companion.

Bijou possesses several distinctive traits and abilities tied to this function. Notably, Bijou's ears are highly sensitive and capable of detecting the presence of evil, specifically a type of threat known as Interference Demons. Beyond this sensory ability, Bijou also emits a unique, pleasant scent that has a calming effect on others, a quality that has proven to be quite alluring to certain characters. In terms of personality, Bijou is presented as a straightforward and thorough communicator, ensuring explanations are complete even if Bijou does not possess all the answers regarding the Interference Demons or other mysteries.

Bijou plays a foundational role in the story by being the first to appear alongside the main character, Kagari, before she even awakens as a Princess. Following Kagari's transformation and acceptance of her duties, Bijou begins to accompany her directly, acting as a constant presence throughout her journey. The fairy's key relationships are therefore centered on the Princesses, acting as a mentor and support system. Regarding Bijou's own background, while the official age has not been disclosed, there are contextual hints suggesting Bijou is an adult individual, particularly as Bijou is one of the fairies in Alicepia who can speak human language. Furthermore, Bijou is implied to carry significant secrets, adding an element of mystery to the character's past and true nature. Information on Bijou's personal development throughout the series is not available at this time.