Julian is bothering Auggie because it appearence. He isn’t really asking he is being sarcastic , as we see darth sidious is very pale and he is wrinkled. He is very ugly, This gives us, the readers, a clue which means that Auggie is very ugly.
We have new clues about auggie’s aspect again in this part as we see auggie has a braid like padawans had he cutted it because he didn’t liked the class partners to bother him for it like “Hi Padawan” or “who do you think you are, a padawan!!”
I Jango fett think is auggie’s favourie’s character because he is very lonley as him he just have his son as company, also because he rarely shows his face a thing that auggie would like because he is ugly.