"Does including diversity in media lead to a net positive happyness?"
That seems impossible to answer without actual data. It might be that having one game here or there is good enough to make people feel happy and represented, and that the majority wouldn't mind playing as somebody else now and then.
OR
I could easily imagine it being the reverse. Minorities at best would still only ever get occasional games they identify with the characters in, just statistically, and don't get that much more utility, and the majority players lose utility on every game by being unable to identify with all the minority main characters.
So I'm confused. Are you telling me that I cannot at once believe both of the following in this context:
A) More important than the particulars of most possible decisions is that a choice is allowed between them
B) Many of those decisions are better choices than others
Because that is what I'm asserting.
1) Those two are definitely not mutually exclusive logically. It is possible to believe both, sure.
2) That said, I don't think (A) is consistent with most traditional moral systems. Traditionally, the priority would usually be more like "figure out the best thing and then make all the folks do that thing because it's best." Unless it's just something so inconsequential that it isn't part of the moral system at all. Which is also pretty possible when talking about video games... but if so, neither (A) nor (B) would really be specifically endorsed. More like just an unregulated free for all due to the minor importance. For instance, the Old Testament doesn't say anything about whether or not you should step on cracks in the sidewalk. But that shouldn't really be construed to be an active respect for your "right" to step on cracks or not, nor is it a position on one choice being more correct.
3) (B) as stated would be consistent with every moral system ever that had anything specific to say about a choice, because this is the purpose of moral systems. But of course, it's also useless as written. You have to actually say WHICH choices are better for it to mean anything, and once you start filling in those blanks, moral systems will either agree or disagree with you.