Aspergillus Oryzae

Kōjikin is a character in Bacteria at Work.

Real-life use
It is a filamentous fungus (a mold) used in Chinese and other East Asian cuisines to ferment soybeans for making soy sauce and fermented bean paste, and also to saccharify rice, other grains, and potatoes in the making of alcoholic beverages such as huangjiu, sake, makgeolli, and shōchū. The domestication of A. oryzae occurred at least 2000 years ago. A. oryzae is also used for the production of rice vinegars.