In my module, I would like an NPC I created to join your party.
By this, they will follow you and and go to areas where they will, like a normal party.
Is this possible to just do on any NPC? I could imagine a lot of scripting would be involved, which unfortunately, I am not that experienced in.
It depends on how complex you want your NPC party members to be. At its most simple, you would need the companion NPC to have a companion script set. These can be added to the NPC by clicking Import in the properties window, and selecting script sets, and choosing the one called "b_CompanionScripts." Also make sure the NPCs faction is set to "Defender" (one of the standard factions).
Adding and removing the NPC from the party can be handled by "ga_" scripts in conversations.
If you want more complicated companions, or a Storm of Zehir type party creation system, it will involve more work than that. There are a number of Henchman and Companion tutorials and systems available on the NWVault and the Nexus. Just go there and search "companions" and you should find something that will work for you.
It depends on whether you want the NPC to be a companion or a henchman. The OC had both required companions, such as Shandra, and henchmen. I'd look at the scripts for that module.
I'd recommend the Silverwand Sample Campaign, which is smaller and more focused, and very well-commented for the purpose of teaching how to do things like companions and many other things you may need to do in a module or campaign. Companions can be handled quite simply depending on what you want to do.
You can also see this tutorial.
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