After studying, I'd like to say my words on suggestions:
Make a bunch of roles, common ones being like hunters who can goto crafting tables and make crossbows and stuff, uncommon like builders who can make these things
Make fast zombies and poison zombies
Make nests and homes
Make chopping wood
Make a tool for natural resource nodes
Make a bunch of buildings like medical, armor, training, and more, and have players move them
Make water, and this isn't going to be spawned by a tool, only by players, big and small water
Make Civil protection and combine units and robots a VERY rare human spawn, like a technician for it, so they can have guns and advanced armor


Make these ideas combine towards other animals, like maybe crafting nests and skin for armor