Maybe he loved the Munchkin Land / Lollipop Guild look as a kid and went with it. If he likes it, let him rock it.
Who cares? How does his hair effect anyone reading the books?
Wouldnt any fetus Emma carried be aborted whenever she turned to diamond?
I thought Emma couldn't have kids since all her ovules were used to create mini Emmas.
(I could be wrong with that though)