The original developer, EMB4, has given me permission to re-post the mod here and on Minecraft Forums.
Once placed, you can even copy or replace them at your own pace, without any hassle and with complete convenience, which make the mod a force to be reckoned with in the world of Minecraft customization.
Another thing that shows you the large power of this mod is the fact that alongside the normal NPCs you can also add a multitude of other features, which includes things like roles, jobs, dialogues, factions and even a quest system.
Windows Ansi Output Stream [main/INFO] [Launch Wrapper]: Loading tweak class name net.common.launcher.
FMLTweaker [main/INFO] [Launch Wrapper]: Using primary tweak class name net.common.launcher.
Once you get the hang of it, controlling them is very natural and you'll easily get all around the world!