Someone with the skills to hit womp rats with a blaster? Someone with the potential for the Force? A notoriously skilled and reckless flyer, able to just hop into a fighter craft and shoot down the Empire's elite?
Yeah. Some everyman.
Womp rats are about 2 metres in size. Which makes them oddly similar to that staple of 1st level games, the Dire Rat. Potential with the Force is just the Force Sensitivity feat. And he doesn't just hop into that fighter right after leaving the farm - that's several levels later.
But I don't recall anything approaching a training montage from the Rebel Alliance.
In the realistic version of Star Wars, any kid who comes straight off the farm and gets put into the cockpit of a fighter winds up dead. No amount of flying around in speeders, or even being "the best push pilot in the Outer Rim" is going to help with that - prior to meeting Han Solo, Luke had never left the atmosphere; at best it's like going from being a race car driver to piloting a stealth bomber.
Either Luke received a crash course from the Alliance, or the Star Wars universe follows the d20 convention that PCs can increase their ranks in any skills at level-up, even if they haven't used them.
A notorious bravo already able to take on professional soldiers? The Cardinal's Guard were not everymen. They were professional soldiers and could cut through average commoners like a hot knife through butter. Yes, D'Artagnian wasn't one of the elite musketeers yet. But he was hardly an everyman.
Again, per the book*, D'Argtanian had had some training, but he was an arrogant young fool who was nowhere near as skilled as he thought. Prior to the aborted duel with the musketeers, he'd managed to insult practically everyone he'd met, been beaten up, and been robbed. And, had it not been for the intervention of the guards, he would have been dead imminently.
Almost exactly like Luke, in fact.
And per the 3e Monster Manual, a 1st level Warrior is a CR 1/2 challenge - prime fodder for a 1st level encounter.
* Film versions of "The Three Musketeers" obviously vary significantly.
I'm not sure I can call Obi-Wan in Episode Jar-Jar first level. But the rest, yes. And there are ways of handling different levels.
I'd like to draw one subtle (but important) distinction here - I don't think that those should all be
first level, necessarily, merely that they should all be suitable
starter characters. (And, yes, I believe that the same should also be true of D'Argtanian, any of the four Hobbits, or for that matter Bilbo and most of the twelve Dwarves.)
Of course, in a level-based game, those two concepts are almost certain to mean the same thing (since you're expected to start at 1st level). But if the game were potentially to allow for different starting points, or of course if it were not level-based to start with, then that opens the discussion somewhat.