Aspergillus Oryzae, often referred to as A. Oryzae, is a character from the anime series Moyashimon. This character is a tiny, anthropomorphized representation of the actual fungus used in the fermentation of sake, soy sauce, and miso. In the series, A. Oryzae plays the role of a helpful microorganism, guiding the protagonist, Tadayasu Sawaki, who has a unique ability to see and communicate with microbes. A. Oryzae's presence is key in illustrating the scientific and educational aspects of fermentation and biotechnology in the show.