Custom NPCs Mod allows you to create new NPCs, mob spawners, and even copy them, not to mention using other items for aesthetic purposes while the weapons deal similar damage to the vanilla weapons. While it works primarily for singleplayer, it is multiplayer enabled. This mod includes extra features such as factions, roles, and jobs, dialogues, and a quest system.

Detail and Download here : Custom NPCs Mod

See also : Mods for minecraft 1.8