How the fuck does he have black hair? The genetics don’t make sense. Let’s look at his family for a second here.
Leia - brunette
Han - brunette
Luke - blonde
Anakin - blonde
Padmé - brunette
Shmi - brunette
All of Padmé’s shown family - brunette
At least one of Han’s parents - brunette
Unless one of Han’s parents had really strong black hair genetics, Kylo/Ben’s hair should either be brown or blonde (which is extremely unlikely but someone Luke managed to have blonde hair, even though Anakin was the only one to carry that gene).
So, what? Does Kylo/Ben dye his hair to be more in tune with the Dark Side or something?