Well, I love Jason Momoa and I love Kazuki Kitamura, but I don't see any resemblance - different hair, different eyes, different body type... Actually, I think Kazuki sometimes looks a little bit like young George Clooney.
Momoa & Kitamura have same shapes of their face-figures & look in their eyes. You say, he has different hair, eyes etc but then you compare him to a white guy (clooney). Momoa is half Native-Hawaiian and they resemble asians. Clooney has no temperament/fire in his eyes, he is calm, mature and kinda boring. Momoa and Kitamura have temperament in their eyes as if they always cooking up some scheme/plan. Especially if they smile they look similar.
Clooney used to have temperament in his eyes, when he was younger. Well, I really don't see anything from Momoa in Kazuki, and I have watched EVERY movie and TV series Kazuki has made and most of Momoa's work. And it's not about race at all. If you give me your e-mail I can send you a pic where I think Kazuki resembles young Clooney the most. But I agree Kazuki has more drive and passion than Clooney. Please, don't get me wrong, I don't want to argue with you, we just see Kazuki differently, let's not argue about that please. I like that we both like KK and Momoa as well, we probably have the same taste in men.
I think he is not gay, but he might be bisexual, he is exactly that type. And the way he dresses himself in private is also quite unisex. Are you Japanese? Do you know who is he dating? Or any rumors about him? Is he a party person? Lots of drinking, smoking and so on? Because he looks like that. It is a problem to find anything about his personal life for people who don't know kanji :(