It's pretty sad when the custom PC is the most bland and normal of all the characters, while the "side characters" are all super special. And I totally feel that about the undead guy becoming a vendor. I had that conversation with him and was so excited to bump into him later on in the game and see what he wanted from me and what he was all about, like maybe he had a questline or something for me? And then he just randomly shows up in my camp as the cheapest vendor in existence. Like really? Even the vendors in this game are more special than my PC!
Apparently, despite my character supposedly being the main character of this game, she's just some Drow named Tav who just so happened to get abducted by some mind flayers. Meanwhile one of my companions literally has something to do with a goddess and could apparently cause the destruction of the entire world. It's like the opposite of Skyrim, where instead of being some super badass dude who can eat the souls of dragons, you play as Lydia and your job is to just carry his shit around.