Help, when I fast travel this NPC spawns and always follows me and never leaves.

[Ayboii123]

I don't know because of mods or something but every time I fast travel, this npc shows up and keeps following me.

Edited July 13, 2018 by Ayboii123

[dubiousintent]

Sorry, that's too vague to be of any help. At the very least we need the name of the NPC. With that you can try checking either "The Vault" or "Nukapedia" on their name to see what is commonly known about them.

 

If the NPC is not from the vanilla game, then you need to see the 'Issue: Find the source mod-index of an object in-game' entry in the wiki "Fallout NV Mod Conflict Troubleshooting" guide. That will at least tell you which mod the NPC is from.

If none of that helps, then please provide ALL the information requested in the wiki "How to ask for help" article. Don't forget to identify things that do not appear in the "load order", such as NVSE and it's related plugins, texture replacements (specifically their larger image sizes: 1024x1024, etc.), and "post-processors" like ENB or SweetFX.

* See "How to markup images (etc) in forum posts and comments" article.

-Dubious-