There's quite a lot of woman mangaka that give a lot of contribution to the manga industry.
Rumiko Takahashi
Hiromu Arakawa.
Kaoru Mori
to name a few
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To answer OP title: Because there are more white people working in video games and the facts that white male still one of the most dominant purchaser of mainstream videogame. At least that's what i think. Even Japanese studio usually make rhe main character a white male when making video games located in North America and targeting western market.
Yeah I think it's this. It's sort of like how in some circles it's a big deal if there is a white guy who is a rapper. There's nothing wrong with that (the white rapper), but certain things just somehow find a category they fit into whether it was intentional or not, and sometimes it's just a result of said element being created by the people of that category.
Of course many people of different genders, beliefs, and races play these games; that's definitely a given. I suppose if one where to do an actual test and find out the majority race, gender, etc of the people who not only play, but also make the games, it might end up being a little more telling.
On the Japanese side of things, it's a little tricky. I personally see the characters in most Japanese games as looking Japanese, maybe not completely in their physical features, but definitely in regards to hair, clothes, mannerisms, and the like. Take Vanille from FFXIII (I know, I know, we hate the game.) Her mannerisms and actions would look kind of..I dunno...odd if you saw your average non Asian girl doing them? But that type of body language certainly isn't out of place in Japan and a lot of us know or recognize that.
I think if you look at Japanese cosplayers, the majority of the time they have no trouble looking like the characters they are trying to portray.
I feel this is because the base design of said character is very Japanese in it's own right. There are even plenty of Youtube videos out there on the techniques an Asian woman might use to give her eyes a more rounded look. No, not rounded in a western sense (well I've seen some disturbing cases..but let's not go into that) but just enough that it just completes that "look" that they are going for that, if anything, is still very Japanese.
Using Final Fantasy again, just take a look at Barrett and Sazh. They are obviously black, but I have to say, one of them is a super stereotype (Barrett), and the other is much better in that regard, but still has a lot of those Japanese style mannerisms as well as a hint of stereotype (his afro hair, his bit of a dancing "jive" in a battle.) Where does fault lie then? White people did not make that game, people in Japan who only know what they know made it. Neither of them act like any of my black friends, they are like caricatures. Sort of like when you look at the portrayal of Asians in older media...well heck...some of that still lingers a bit today. The comedic stupid accent, the attire....the stereotype is overall weaker, but you still see it, and I think that is simply because of it being a product of people who are not the race that is being portrayed. Other examples in the reverse (on the Japanese side of things) would be characters like Mr. Popo from Dragonball and Oil Man from Mega Man Powered Up.
For me I just don't pay too much attention to it, I understand that certain things are a product of their environment and that shapes what they are, just like people can be. Is that true across the board? Of course not! Plenty of people grow up in broken homes or bad parts of town and become successful in life just as there are many privileged individuals that end up being batshit crazy and either die or end up in jail. Just recently that one dude who committed that shooting.....he was living the life of a child of a director in Hollywood. He committed his crime in his BMW...and I think he was either a high school kid or not that far past it. We can assume he came from a pretty cushy lifestyle and just look at him...killing people because I guess he was mad that girls wouldn't pay attention to him. Ridiculous.
Anyway, I think the change comes when people are more proactive about getting involved. I can see the effort in calling light to it or something of that nature, but the real change is when the people who want it, get involved and make those changes and contribute rather than hoping or waiting for others to do it first. If we want more women portrayed in games, more people of different races, then I say we need more women, and people of those races in the industry making those kinds of things. On one side those things will then exist, and on the other, we would have more reasonable portrayals than somebody else's stereotypical approximation.
