|Size||usually 0.5 to 5μm|
|Role||Antagonists who use human body as a host to live in and multiply.|
Bacteria resemble the larger bully in the series, Stroppy, who was also the villain in Once Upon a Time... Space. Bacteria usually have humanoid forms with various physical features, like wide abdomens, multiple pairs of limbs etc. and are always blue in color (save for diplococci that were yellow). The leader, who resembles Stroppy, usually distinguishes by a big, red nose, thick eyebrows, and similarly shaped head like his human counterpart.