There are no humans in Star Wars, so what are the creatures we are watching?

From 2013, but new to me, Max Gladstone makes some close observations regarding the odd world of Episodes 1-6.

The title card tells us that the story takes place long time ago, in a galaxy far, far away. So the characters aren't actually human or even necessarily from a human-like society, they're just played by human actors.

What can we learn about the creatures true nature from studying the first six movies?

I think a few important context clues present a very different picture of the dominant race of the Original Trilogy.

Gender is the most important clue. The Original Trilogy has a shortage of women when considered by the standards of a two-sexed mammalian species. Leia is the most prominent female, and the only one to feature in all three movies. Aunt Beru and Mon Mothma also have named speaking roles. Aside from these three, I cant think of another definitely-female-definitely-human in the series. In RotJ Leia describes her mother, who is obviously a queen. These females all possess at least local political and social authority.

Family is a second important clueor, rather, the absence of family. With one notable exception, people in the series dont talk much about parentage. No non-Force sensitive male ever describes his family, if I recall correctly. Han, Lando, Wedge, Biggs, Tarkin, Dodonna, and so forth, all might as well have sprung from the brows of their ships. In six+hours of film about war, I would expect to see someone to drop at least a single reference to parents of some sort.