Custom NPCs is a mod that lets you add NPCs (non player characters) that can do a lot of roles. It only +works in Creative, unless you are cheating the wand in. These characters can be assigned to be anything from a guard to a trader. They can even be set so they drop certain items when they die! You can also set their skin, so they look like their role. They can be given items to trade or weapons and armor to attack enemies with. From acting as traders in a multiplayer game to being guards for your obsidian fortress, Custom NPCs can do it all.