Recently I spawned multiple random strolling NPCS around my town, and it's been working great.

one issue is I have is that, like any other entities, once they come in contact with nether portal, they will teleport to the nether.
I found many of my npcs in town missing, and after searching them it turned out they've been either killed in the nether due to high altitude or from monsters, or can't get their way back to the overworld, or strolled too far to even know where they went in the nether.

One thing that would greatly benefit from this situation is adding a option to toggle on/off whether the NPC can enter the nether portal or not.
I know I could always place some fence gates or surround the portal with walls and doors, but I have placed my nether portals throughout the town and I was looking for if this can be done in the first place.

I would also love to see some designated pathway configuration for NPCs to walk, like u set a point A to B to C and on, as well as the Customizable NPCs' Strolling range (like how far they can go in a circle or square range I think).

let me know if I should post the latters into a seperate feature request.

keep up the good work!