Okay so the thing is. The THING IS.
I use he/him for both, but neither Space nor Ventro are male. They’re aliens; their genders are alien.
Ventro’s gender is drone, and he’s trans. What that means is that he was hatched and raised a soldier, and is soldier-sized, but his gender identity (and, now, hormones) is the small, brightly colored interitrask caste that carries eggs in their bodies until those eggs are fertilized and the shells have hardened.
Space’s gender is nonexistant, and his species is unisex. His social role is non-parenting grunt worker; if he ever became a parent, a leader, a teacher, or someone who held community life and death in their hands (doctor, clergy, mortician, farmer, environmental support systems engineer, sanitation worker, etc.), his social status and pronouns would change.
All of which is to say that I could change their English pronouns to she/her without changing a single other thing about the book,
And that this would absolutely change the vibe of the book for many English-speaking readers (including myself tbh let’s not pretend I’m immune to subconscious influence),
And that I don’t really know what to do with that!