Freelance worker Villager (New Villager mob type)

Collecting materials can be a chore and a hassle. My fix for this was Villager Freelance workers. They would be paid with emeralds. Examples is harvesting gravel. Pay the villager, and he will mine and collect gravel from an area specified by the player. They could also assist with strip mining, wood harvesting, and terraforming. They would fill a role, normally occupied by other players. Stretching this idea a little,  they can be outfitted with armour and weapons and fight monsters. This villager could be its own unique mob, or function with some job block in mind. In my personal opinion, going on an adventure with a party of villagers would be a cool and unique experience, which would enrich the relationship between the player and villagers.