The main characters are not human being. They are not, Full Stop.
Luke Skywalker? Not human in the least.
Why is that you ask? Because the first movie starts out saying “a long time ago, in a galaxy, far, far away.”
Now, unless the entire star wars galaxy is a cross over with Doctor Who, humans did not colonize other planets plants in the far past. Thus, Princess Leia, Han Solo, and the rest are humanoid aliens.
Any conclusions that have been reached, that must have been true, but work against the intension of the author?
p.s. I will not be surprised if this topic dies out.
p.s.s. I would have searched for this having been discussed in the past, since I finally found the search button, down there on the bottom right hand side of the screen, under the forum jump menu, but being as how I am only a guest, and a poor one at that, can’t access it.