You can force NPCs to follow you or stop. Use inside the NPC:
- function follow - The NPC will follow you
- function stop - The NPC will stop following you

Run these commands near an NPC, not inside:
- function xtra_small - Change NPC height to 0.6
- function small - Change NPC height to 1.1
- function medium - Change NPC height to 2.1
- function tall - Change NPC height to 3.1
These items can adjust the collision height of the custom NPCs.

Hold the item and interact with the NPC to to easily adjust its height.

In version 5 and up was added the ability for you to add your own custom models and skins. Here is a video to show you how.
If you are knowledgeable about addons you could even add your own animations.
1. The barrier can be received by the command: /give @s barrier
2. Take the barrier in your hands, hover over the NPC
3. Press the ยซRemove NPCยป button
