Mushibu is the collective name for the Heavenly Creative Agency's insect design department. This team comprises seven members who are physically indistinguishable, all possessing neck-length black hair and typically obscured eyes. The sole differentiation between them is the color of their shirts.

They function as experts dedicated to designing and researching insects. The Mushibu team operates as a single cohesive unit, frequently speaking in unison. Their intense fascination with insects is pronounced and occasionally causes discomfort for other departments due to its overwhelming focus.

Professionally, Mushibu collaborates with the main animal design department whenever insect-related elements are needed for creature designs. They lend specialized expertise and inspiration for projects requiring arthropod characteristics. Their documented work includes refining a giant dragonfly prototype down to a manageable scale.

Details beyond their professional role and team function within the agency remain undocumented.