Thought this mod could use a thread for these like a lot of other overhaul mods. I'll start:

Use of the [POP_RATIO] function so that not all races have 50/50 gender balances. Since migration can provide generous amounts of new citizens, gender ratios can be played around without fear of breaking game balance.

As for some examples, some insects in vanilla Dwarf Fortress are overwhelmingly female drones with only a few males to accompany the queen. Maybe the Itchlari could do something like that. And I'm sure it wouldn't be out of place for the amazonian Aerians (whose description literally references all-female tribes) to do something like that. Or maybe the Kytsuni or Faexari as well since they mythological creatures they're based on tend to be overwhelmingly depicted as female in popular culture.

Inversely it goes without saying that Dwarves are depicted as overwhelmingly male in most settings. And Orcs play well into the machismo-centric, male-lead stereotype as well.

Actually, since the game uses subspecies (castes) instead of real binary genders in the game code, you can go nuts and think outside the box. Maybe no genders at all for the stone-based Zhaahara. Or many genders (representing different species of flower/plants) for the Roflorians.