Zako basically means common enemy.
Also does this mean though that stage 4 only has enemies from previous stages/updates or are there new enemies that simply aren't finished (is there even a new boss?)?
Shame if the former cause I did like messing with enemies by stunning them with lightning since they get different animations compared to flinches/losing their hp (or just draining the stamina bar in the case of bosses like Morgan, whose got one of my favorites cause belly clutch).
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The priest also has a fun one where it looks like she's praying. I would have went back for a screenshot, but I lost my save file abit ago (the shop bugged out on me anyway after defeating the 3-B's succubus boss) and I don't feel like going all the way through again (especially the 1-3/2-3/3-3 dungeon stages, which just drag too long with frequent encounters).