I always have loved microorganisms, especially amoebas. So here are some courtesy of your local pond.

An amoeba takes its pet t4 virus on a walk through the lovely green pondscum. I had too much fun with this in opencanvas. This particular ameboa-person shows up in my sketchbook a lot because they are fun to doodle. Amoebas can take any shape they want naturally, this one generally looks roughly humanoid in form.
Asexual fission ftw. The amoeba (and everything else in here) is an it, as all these organisms are asexual and genderless... Despite some people's assumptions, it is not a girl, nor a boy, nor does it want to be either of those things, thank you.

Paramecium, paramecium, euglena!