The fondness idea is bad. They should have a community inside a huge hollow tree. They should leave a trail of vegetation on any grass or dirt bloc.tif you give them saplings, apples, etc. They will give you items like wood logs and if you do that enough the "leader" which is like a slightly bigger version will take you into a secret room and there is a chest with random supplies and a sapling that will grow another giant tree and will "grow" sprites from it that will farm for you, give you plant related items, and make you their "leader". The ones that come from your tree carry special seeds that when used will wrap any aggressive mob in vines. The sprite will then proceed to attack said mob with wood swords, hoes, and axes.
This is an incredible and i have read all the post on this thread and about 99.9% of them are good ideas' but i definitly think this should be implemented into the game, just make sure it happens hahaha