I would say that it’s completely up to you. I doubt the reader would mind too much if you do or don’t. Personally, I don’t have descriptions of characters beforehand, but go for it it you want to. About the customising, I have specific features change depending on what the readers character looks like. You don’t have to give the option to customise family members, but you will probably get people asking for it if you leave the fanmail on.
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