Thank you for your feedback too!
I agree that with the number of Wawps it might make the ecosystem unbalanced if they only took the docile creatures-- To fix this you could perhaps change it to where they only take the predators/attacking beasts and use the docile beasts as bait? Wawsps would get a much more complex relationship with the surrounding systems other than "Take everything and eat it"
I also think that docile creatures could/should be used as a way to have advantage in battle, to explain this I'll use two examples that I've come up with:
Spideperdys (Spider centipedes), while at first you may think it is a hostile monster, they actually like big balls of web/juice (think Luigi's Manison: Dark Moon's first mansion) that can be inhaled and spit at hostile monsters to slow them down, and set on fire to either clear it out or to make incoming monsters think twice. The webs could also slow you down, and if you start burning them the Spideperdys could also become hostile. (These mobs could probably only work in dungeons though because it would be hard to program points of where they can spin their webs on flat ground, but suggestions aren't about realism are they?)
Kiwirds (Kiwi Birds) that lay various explosive fruit products, of which you can suck up and spit out for a big explosion! Adding something like this would add a new structure (nest) with a new dynamic to open up. Monsters could try and get the "egg" while the Momma Kiwird isn't there, and use that against you in battle, like you could to the monsters- some monsters should probably do this more than others (Like the Klown and the Stroll Fiend), the monsters could also eat it to get bigger or go faster, maybe even have an explosive punch. You could also add more elements of danger to this from the actual Kiwird with a Momma Kiwird swooping down and stealing your pineapple gun if you have it out (because she thinks it is her egg) or have her become hostile if you get close to her nest (Which she could also do with the other monsters). The only thing that would crop up is the reason of going away from the nest so you (or others) could actually steal the eggs
It was so nice thinking of docile monsters I forgot what I was going to say next, thank you for this thread!