NPC

NPCs are passive mobs that have a mob model similar to villagers. They are exclusive to the Education Edition.

Spawning
NPCs do not spawn naturally, however, they have a spawn egg in the creative inventory. It can also be spawned using commands. 

NPCs have a custom name when spawned:.

Behavior
NPCs will show a "Talk" button if you tap and hold on them.

NPCs  page could only be edited if the player has a permission as a world builder.

Trivia

 * NPCs have villager sounds.
 * NPCs name can't be changed using nametags, so the only way to make NPCs name editable if the player using the  command.
 * NPCs are invulnerable, even if the player that is hitting it is in creative mode. The only way to kill NPCs is using commands, or drop it to fall into the void
 * NPCs can't move themselves, so they can only moved using just one command, a piston or sticky piston, minecart or boat or by pushing it with water.