Damn... You were 7 when Ruby/Sapphire came out? Didn't know more than a decade has passed since then.
I feel so old. I was probably like...12-13 but I always thought you were older than me. -looks at your age in your profile and starts slapping myself with anti-aging cream- D:
You can't do customization. They tried to stay true to R/S as much as possible and the main characters aren't supposed to be anyone, they're supposed to be the protagonists of R/S.