Just a fun little observation
I find it a little wrong-headed to suppose the practice of adapting otherwise inconsequential characters into involved plots began with My Little Pony Friendship is Magic. A surprisingly common complaint is that fans are too vehement about turning the auxiliary cast or 'background ponies' into personalities with their own fan created histories.
Two words: Boba Fett.
This scene will be familiar to fans of science fiction and fans of Star Wars (like me) will be able to name every character currently in this scene, including the Imperial deck crew.
This is impressive given that NONE OF THESE PEOPLE ARE NAMED IN THE MOVIE.
Boba Fett was not a character. He was a throwaway walk on roll primarily for a joke which in retrospect doesn't make a lot of sense. Vadar points at him and admonishes 'NO disintegrations'.
Logically that would make Boba the worst bounty hunter to ever live if he has to be told not to kill let alone disintegrate the people he's sent to capture, but something about his costume and mystique made him an integral part of not only the next movie but the series as a whole.
Even though at no point when he's introduced does he say anything but maybe a little irritated grunt.
But its this kind of fan-spawned insanity that leads to a story living forever. Sure its silly to name and essentially adopt people who by rights have nothing to do with a story except to show up and look pretty for one moment only, but in doing so we now have so much more present in this small little sequence then even George Lucas could have conceived. Each of these characters now has an identity beyond filler and they've shown up in all kinds of games, shows, comics and books since to have their own adventures.
Its like the original book of The Neverending Story by Michael Ende in which every action, every meeting, every parting, every single instance of the story is followed by 'but that's another story for another time'.
Even the most incidental characters, given the care, could be the next hero of another tale elsewhere, carrying with them the name of their origins into new frontiers.
This is why Octavia, Derpy, and Dr. Hooves are similar to Dengar and IG88.
Why don't more stories do this? George Lucas could have had a bunch of non-discript armored soldiers standing in as bounty hunters and there'd have been no change to a largely expository scene, but in using these costumes, in suggesting a galaxy beyond the bounds of the film itself he created something else entirely.