I agree, I'd like to be able to choose the origin class at character creation rather than waiting until I make it to Withers. It gets me off to a bad start when I have to discount all the things that happened in those first couple of levels.
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As for not being able to change the appearance of the origin characters, I'm not sure why that's an issue. In general, I accept it, but I don't necessarily understand it. I can't help but think there must be a reason.