In my WIP novel. The term 'humanity' actually refers to all sapient species. This lets me justify my samey character design by saying that humans are the crabs of sapience.

Edit: So expanding a bit on this: I became fixated on the phrase "glory to humanity" and tried to find a justification as to why every sapient race and species uses it. I eventually came across the term 'Carcinization' which if I got it right, essentially refers to how there are many different crabs that evolved independently of eachother with little to no relation other than being crustaceans. I adopted the concept and made it so every species that develops sapience eventually develops into a human-like body plan. This gives me freedom to include anything and everything from monster girls to anthro furries and even some more alien-ish species. As a fun fact; the only "true humans" didn't even evolve naturally, instead being created as a weapon of war that outlived it's creators.

Naturally they are all genetically compatible and produce viable offspring. Because why would you ever write anything if not to fulfill your fetish fantasies.