The worms could provide a hide used for further armor upgrades possibly? Perhaps they could be found in a garden area or even mainly underground. Perhaps under the wood pile?
Bees don't seem to be as neutral as they're supposedly are. Terrified by wasps and I can only imagine what they would do.
I can see the butterflies being introduced around the flowers or maybe the Upper Yard to the left of the house. They can drop pollen, too. Wings for a glider! Or hang glider!
I really like these ideas. Thanks for sharing them!