Can a Japanese person have..?

I'm writing a story in which a part Caucasian part Mexican female, and a part Caucasian part Japanese male have a child. I want to describe the child as having "Sparkling green eyes" from his mother's side, which I believe is totally possible(?) to have fairly tanned skin (That's possible right?)

and his hair to be a very dark brown but with a reddish tinge from his father side, maybe?

My question is,

A. Is that possible, for a half Caucasian half Japanese person to produce a child with dark hair with a reddish tinge? If not, what's the closest to it?

B. With that mix, should the child more-so have lighter skin or is tanned skin acceptable?

and on a different subject, C. If Mexican is a nationality, then is the race automatically Mexican, or is there more to it..?

Thankyou in advance and no idiots, please?

I'm really wanting to write about this because It is a gorgeous mix,

a half Japanese friend of mine had a baby with a Mexican and the baby is so cute n_n