NPC exists
Whether an NPC with that name is in the world.
A Minecraft element (a check) in Plugins. Needs the Basic plan or higher to go live; building and testing are free.
Example
When the server starts → If NPC exists: guide is not → Create an NPC.
Also called
has npc, npc there, npc check
Works as a data pack?
No. This one needs the Elementium plugin on a Paper server.