Custom NPCs in Game

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I think that this is something along the lines of the many recruit mods, but I'm not really sure as I have not had much luck deciphering those things. Anyway, I was wondering what I nee to do in order to place custom made NPCs into the standard game. For example, I've created an NPC called Tran Ulrich, I've made equipment for him and everything including a story and I'm working on scripts. Anyway, I would like to see him in the game, and possibly make him a recruitable character. I have no idea if this could work to the extent I'm hoping for, or it it will work at all for that matter, but I would like any help that could be offered.