Just change animations of the biters, spitters, spawners and worms into an army of humans. Non-game-changing, only change looks. Thanks JD-Plays for the fix!
Would it be very difficult to make it so each tier (small, medium, big, and behemoth) has the color associated with that tier? Examples would be a small biter would be a brown human, big spitter would be a blue tank, and a behemoth worm would be a green turret?
This mod doesn't actually contain any sprites itself save for the mod icon image as it uses the game's own built-in sprites and animations.
If you know some Lua and have the patience to learn the Factorio API feel free to lookover https://github.com/SirHall/humanoids2/blob/main/data.lua and open up a pull request.
Unfortunately I do not have time to maintain Factorio mods but I will certainly update this page should any new updates be made by others.