Test.java

@Getter
@Setter
public class NPC {

    private Location location;
    private String name;
    private EntityPlayer entity;


    public NPC(Location location, OfflinePlayer fake) {
        this.location = location;
        MinecraftServer nmsServer = ((CraftServer) Bukkit.getServer()).getServer();
        WorldServer nmsWorld = ((CraftWorld) location.getWorld()).getHandle();
        entity = new EntityPlayer(nmsServer, nmsWorld, new GameProfile(fake.getUniqueId(), ""), new PlayerInteractManager(nmsWorld));
        entity.setLocation(location.getX(), location.getY(), location.getZ(), location.getYaw() * 256.0F / 360.0F, location.getPitch() * 256.0F / 360.0F);

    }


    public void show(Player... target) {
        remove(target);
        PacketPlayOutPlayerInfo add = new PacketPlayOutPlayerInfo(PacketPlayOutPlayerInfo.EnumPlayerInfoAction.ADD_PLAYER, entity);
        PacketPlayOutNamedEntitySpawn spawn = new PacketPlayOutNamedEntitySpawn(entity);
        PacketPlayOutEntityHeadRotation rotate = new PacketPlayOutEntityHeadRotation(entity, (byte) (location.getYaw() * 256.0F / 360.0F));
        for (Player player : target) {
            PlayerConnection connection = ((CraftPlayer) player).getHandle().playerConnection;
            connection.sendPacket(add);
            connection.sendPacket(spawn);
            connection.sendPacket(rotate);
        }
    }

    public void hideAndShow(Player... target) {
        remove(target);
        // if you remove the delay the NPC will dissapear completely.
        new BukkitRunnable() {
            @Override
            public void run() {
                show(target);
            }
        }.runTaskLater(Core.i(), 2);
    }

    public void setHand(ItemStack item) {
        entity.inventory.setItem(entity.inventory.itemInHandIndex, CraftItemStack.asNMSCopy(item));
    }

    public void remove(Player... player) {

        PacketPlayOutEntityDestroy packet = new PacketPlayOutEntityDestroy(entity.getId());
        for (Player viewer : player) {
            ((CraftPlayer) viewer).getHandle().playerConnection.sendPacket(packet);
        }
    }

    public void onInteract(Player p) {
        p.sendMessage(ChatColor.GREEN + "Thanks for interacting with me, " + p.getName() + "!");
        //todo open inventory or sth
    }
}