Theres some guy who is spamming the creator to make the MC white and downvoting him everyday he doesn't. You sound like him. Even if you aren't, you seem to be implying that most hentai games don't have white MC's, which is the opposite of the truth. Just relax.
Why does skin color matter? And actually, there are SO MANY games with white player characters that your question is pointless. Leave the white bed sheet at home, stop hanging out at the klan rallies, and educate yourself and be open to people who don't look exactly like you..