Addon: Creepypasta

Herobrine: Herobrine will chase you until you die.

Entity 303: This entity will haunt you and bring nightmares to your Minecraft world.

Null:

It lurks in the shadows waiting for the players.

Enderbrine: It can teleport, get angry when you look at it and other resemblance to that of an enderman.

Green Steve: It will throw emeralds at its victims and even attack some of the entities. It won't spare the players either.

Faceless Steve:He travels from world to world, seeking unwary victims that are only looking for having fun time.

Billy: This entity is rather just a lonely fellow who wants to make friends. but don't let this fool you.

Vllr: A creepy villager who will do his best to haunt the players who enter his territory.. He shows signs of telepathy and some sort of magic abilities.