I can't really answer this question by using your poll.
The real way to determine whether or not a minority should be in your game is something you should do by asking yourself why?/why not in relation to the world and the narrative you're crafting, not because of some non-sense idea about either conformity to some political ideal, or because you want your game to sell better.
Doing either of those latter things will cheapen your entire game.
When big publishing companies create an environment where minority characters are opted out of because they won't back games that have them in fear of the games not selling in predominately white countries like the states or the U.K - that's an issue in my opinion.
That being said, so is the opposite - when people start adding people of color simply because if you don't, you'll get socially ostracized and labeled a biggot by the the cultural elite.
If you're creating a game set in modern day U.S, I'd expect a certain amount of diversity - if you're creating a English Medieval action game, I wouldn't expect nearly as much, and there should be room for both kinds of games, and they should both be judged on their own merits, not on some imaginary metric of the perfect balance of ethnicities.
So, with that being said, if I have a minority in my game, it's because A) I just want to, for personal reasons, B.) it's a conscious design choice, and I thought that looked the best or C.) because it's relevant to the plot.
Stil though, white people tend to write primarily white characters, and if you live in a predominately caucasian country, you're going to get predominately "white" narratives.
This trend isn't unique to predominately caucasian countries though, as if you go to African countries most books will be about Africans, and if you go to Japan or China, most stories will be about Japanese and Chinese people respectively.
I think the reason for this is kinda obvious - it's partly about sub-conscious projection, people writng about what they know/unconsciously think of as the norm, and of course people writing what they can identify with viscerally speaking.
Although, it's obviously true that most of us can identify with the stories and personalities of people across cultures and ethnicies, I think people also generally prefer characters being "close to themselves" so to speak - a sentiment which I think is pretty strongly reflected when people ask for minority representation in games to begin with -
if having characters being close to you in some way on a visceral level wasn't important at all, then why would anyone ask for certain skin-colors at all?
Still though, it always struck me as odd when people complain about lack of representation in media, when they're talking about a group of people that after all, "lack representation" in the over-all population at large as well (which should be obvious by the use of the very term "minority" to begin with, I would think).
That being said though, as a white person, I still don't really write nor design white characters - but perhaps I'm kinda the odd one out in that regards.
I grew up consuming mostly non-western media, socializing with mostly minority friends, so I've never felt in touch with my "native" culture in that sense.
In either case, personally, I find "mixed ethnicities" to be much more visually appealing when I do general design, so most characters I design will be various hues of copper/beige or whatever, neither apparently black nor white (or anything else for that matter). Usually, there is no narrative reason for this.
It's also worth mentioning that a minority in the context of gaming does not necessarily mean what it does in conventional speech -
Because if you're game isn't set in the real world, in a specific country, then you can't assume the same minority labels apply.
For instance, to call Barret a minority, and write him like a minority (I,E experiencing racism etc) makes little to no sense when the game isn't set on earth to begin with, and if you're going to write the world of Gaia(FF7) like an analogy for earth this is going to require much more work and research than it otherwise would.
I don't expect a Japanese writer to be able to write a U.S-centric character of color, and I think that if he or she even tried to do so, most of the time, it would seem to be in poor taste for people who've lived, or been raised in the U.S.