If you've a group of characters without "natural" identifiers of race/gender/etc, the options are:
A) Leave well enough alone, letting the characters be read as whatever currently passes for "default" these days: white/male/straight/cis-gendered/able-bo
Implied lesson: If you do not belong to those "defaults", there is no place for you.
B) Tack on some blatant and awkward signifiers to mark a couple characters as Other than the above.
Implied lesson: If you do not belong to those "defaults", you are exceptional and strange and if you don't fit with the awkward signifiers you're not doing it properly.
...Well. This is a nice Kobayashi Maru scenario, isn't it.
I vote we need another option:
C) Hack the operating parameters.
Implied lesson: This society is crap. Let's change it already.