Enemies can come in many different shapes and sizes as can allies.
Just food for thought
The root distinction we are trying to make here is GM controlled or Player controlled. Yes?
If so then GM Controlled or Player Controlled or some variation might be suitable?
Actually you can create as many or as few Creature Types you want. Go to the file menu and select Edit Creature Types, that will popup a dialog that allows you to edit all of the creature types, including creating new ones and deleting ones you don't like. So you could create the list above or anything else you needed in your game.
I'll update the editor for creature types so that you can choose which types are GM controlled and which types are not.
Having said all that, if there is a default set that we could agree on, I will add that to the code as well.