A game that focuses on BIPOC experiences?
You would not tag that as poc. Or bipoc. Same way you do not tag woman or female. You tag female-protagonist.
But you do not tag non-male-protagonist. As this is what poc or bipoc stands for by analogy.
You might tag poc-perspective, or straightout bipoc-experience but I guess tags like social critisicm and similar would work better. Especially since poc stands for proof of concept in gaming. And it is not even good terms in general. I had to look up what bipoc stands for. Sound like bipolar. Or bi-poc.
If it's about Japanese people in Japan, no, you couldn't.
Sure I could. Correct me if I misunderstood, but poc stands for people of color. Or person of color. Some might imply that it has context of being oppressed as well, but that seems to be more for bipoc, as poc is rather descriptive.
But having "poc" in the game is not dependend of there being non-poc as well or not. You could have all the same cast and it could be poc.
Poc just does not mean minority. It means non-white.
And nobody talked about tagging the exact race (well, "race") of the main character, just a general BIPOC tag.
So you would tag the existence of non-white people in a game? LGBT tags the existence of those topics in a game. Tagging POC would mean what exactly? If no one knows at first glance, the tag is useless. "racism" would be a better tag, if you think "poc" as a tag would stand for the experience of being oppressed, as "racism" is a topic you encounter in the game.
lgbt is to being a person what racism is to being a poc. You might encounter it. But you do not tag person-that-might-have sex. You tag the kind of sex, lgbt in that case. So why tag poc? What you face is not poc, but the racism or oppression or whatever you wanna show in the experience.
That's why I'm suggesting the form that's become popular on social media.
While this is far beyond the scope of gaming tags, I do not think this is a good term. It should not be popular anywhere. It divides instead of unifies. It reaffirms the need for racist thinking. Basically it is just an euphemism for black person. Bipoc adresses that. Badly, as it appropriates "minorities" without asking. Minority would be a better word. Because the inhabitants in most countries are poc by definition (like Japan), but not a minority. But what you think poc or at least bipoc stands for, includes the minority and racism aspect. With lgbt, there at least it is about preference. We are "allowed" to be straight. But we are "not allowed" to discriminate by race.