I've seen some NPCs that follow you if your near, but that won't be right because if the NPC is on the other side of the wall from where you were but you were still close it will see you...

I want an NPC that follows when your in its sight...

Please tell me if its possible...

Solution

You can create a ray from your npc to every Player and check the line of sight. If there is then check which player is the closest and then use Humanoid:MoveTo() to go to that player