I'm Slow, But I'm Wide!
So, I'm curious ...
As to how much of your initial character selection influences Shaun's adult appearance. Skin tone definitely carries over; Shaun can be Caucasian or African-American, though I haven't experimented with the Asian, Hispanic or Indian character models, so I don't know if Shaun could appear to be Asian, Hispanic or Indian.
My current character is dark with black hair, my first was light with blonde hair.
Shaun Jr appeared identical in the second playthrough except for black hair.