Escherichia Coli (Black)

Daichōkin is a character in Cells at Work! BLACK. It is an opportunistic bacteria.

Real-life counterpart
It is a Gram-negative, facultative anaerobic, rod-shaped, coliform bacterium of the genus Escherichia that is commonly found in the lower intestine of warm-blooded organisms (endotherms).

Most E. coli strains are harmless, but some serotypes can cause serious food poisoning in their hosts, and are occasionally responsible for product recalls due to food contamination.