In my builds, I don’t reflect diversity because it’s a cultural mandate. I do it because it’s cool to give uniqueness to the figs. It’s also fun for me to plan out “who goes where” and parse the heads out that I have. It’s like color blocking a starfighter per fig. Spread it around. Give people more coolness to look at.
As for skin tone, fleshies are a No for me, as they are too difficult to acquire in the variety I want, but I’d add brown heads if I had them. The bigger reason I won’t do fleshies overall is that I’d have to do ALL fleshies, and that’s waaaaaay too many heads to replace.
In summary, I work with what I’ve got and concentrate my figs on doing things rather than being yellow or fleshie or brown or whatever. I like to mix it up exactly so I don’t have to think about the diversity thing. To me, it’s far more about unique figs doing cool things and looking cool doing them.