Citizen NPC?

I have a Minecraft Spigot Server I want to create NPC. There remain about 4 NPCs and the remaining newly created ones disappear after each server restart. I tried to configure something there so that they no longer disappear. But it's no use. Someone would be willing to program this plugin identically and remove this garbage that automatically delete or limit. Would be nice if someone helps me there. What should I do now? The NPCs should stay in spite of restarts or something.

I thank you in advance.

Do not reload the server, just enter / npc save. Should be enough.

For other things I have to restart the server at some point. And there's also no Command.

Correctly created NPCs do not disappear and the server is neither reloaded nor restarted and you want to make a change contact the plugin's proger.

Read the instructions on how to create an NPC and don't fumble in a cnfig if you don't know what you're doing there.

Create NPC: / npc create username