And who knows? Maybe Detmer will become the next O'Brian, after a season or two. Or maybe she'll just be another Lt. Kyle, who never really gets fleshed out because she's just a bit player. The show is not required to be an ensemble show about the bridge crew, just because some of the previous Trek shows took that approach. This is a different show, taking a different approach.
I actually do expect to see more from Detmer and Airiam at some point. Detmer because she's the only one on Discovery other than Saru who has history with Burnham. Airiam because they've been teasing about her for awhile now (apparently she's "a favorite of the writers"). But no, they're certainly not
required to flesh them out.
He's saying that they're decoration. His analogy was something like "Imagine TNG where an android named Data was a background character on the bridge, and we never learned anything about him." like, there's this weird guy with pale skin and yellow eyes walking around who may or may not be an android, or alien, who knows.
They're introducing an intriguing new species/robot something via a background character. This is done for the "cantina effect."
In the older shows, the background extras would be human, sometimes vulcan. If they go to the trouble of showing an atypical race, they would also go to the trouble of adding them to the story. Or if they go to the trouble of adding a new alien race, they would have a story about them.
That's what I gather from the posts, but good news: this thread has taught me her name. It's "Airiam" and her species is "Augmented Alien."
Does anyone know the name of the Das Punk girl? I assume she died, along with frightened black Lobot.
That's not it, because he's including Detmer, Owosekun, and other regular humans. He's saying that simply because they are
present in every episode, they must be treated as main characters and have episodes devoted to them, or else they must be absent from more episodes to focus on the real main characters.

It's no wonder we can't make sense of his logic, because he contradicts it nearly every post. Case in point...
K here are the people in the credits of each series in order of appearance
Star Trek Discovery
Sonequa Martin-Green (Michael Burnham)
Doug Jones (Saru)
Shazad Latif (Ash Tyler)
Anthony Rapp (Paul Stamets)
Mary Wiseman (Sylvia Tilly)
Jason Isaacs (Gabriel Lorca)
Star Trek (grabbed season 2)
William Shatner (Kirk)
Leonard Nimoy (Spock)
DeForest Kelley (McCoy)
Star Trek The Next Generation (grabbed season 4)
Patrick Stewart (Jean-Luc Picard)
Jonathan Frakes (William Riker)
Levar Burton (Geordi La Forge)
Michael Dorn (Worf)
Gates McFadden (Beverly Crusher)
Marina Sirtis (Deanna Troi)
Brent Spiner (Data)
Wil Wheaton (Wesley Crusher)
Star Trek Deep Space Nine (grabbed season 5)
Avery Brooks (Sisko)
Rene Auberjonois (Odo)
Michael Dorn (Worf)
Terry Farrell (Dax)
Cirroc Lofton (Jake Sisko)
Colm Meaney (O'Brien)
Armin Shimerman (Quark)
Alexander Siddig (Bashir)
Nana Visitor (Kira)
Star Trek Voyager (grabbed season 4)
Kate Mulgrey (Kathryn Janeway)
Robert Beltran (Chakotay)
Roxann Dawson (B'Elanna Torres)
Robert Duncan McNeill (Tom Paris)
Ethan Phillips (Neelix)
Robert Picardo (The Doctor)
Tim Russ (Tuvok)
Jeri Ryan (Seven of Nine)
Garrett Wang (Harry Kim)
Star Trek Enterprise (grabbed season 2)
Scott Bakula (Jonathan Archer)
John Billingsley (Phlox)
Jolene Blalock (T'Pol)
Dominic Keating (Malcolm Reed)
Anthony Montgomery (Travis Mayweather)
Linda Park (Hoshi Sato)
Connor Trinneer (Charles Tucker III)
Obviously your method of using the intro credits to establish who is a main character falls flat with the original series but I think it does help establish that Star Trek Discovery has fewer characters to work with than any other series. Thanks
Others have at least 8 or 9 "main characters". We're stuck with these 6 even though there are at least 4 other regulars on the bridge.
^ I love how you just sweep TOS under the rug and casually edit its 3 to "at least 8" but happily accept DSC's list of only 6. TOS really did have only 3 characters that were focused on as much as DSC's 6. You can include Scotty, Sulu, and Uhura to reach 6 (though they had much smaller roles and several episodes where they didn't appear at all). There was only a few appearances of Nurse Chapel, and no Chekov in season 1. If you're going to stretch TOS this much, you should
at least add Dr. Culber to DSC's list.
So let's be clear. TOS, ENT, and DSC all have 7 "main" characters. TNG had 8, then 7 post-Wesley. DS9 and VOY had 8, then 9 after Worf and Seven. And that's being generous to the other series, considering Culber is being featured more heavily than Nurse Chapel or Jake Sisko were, or even Sulu, Scotty and Uhura for that matter.
Fewer people means less variety. The 6 we're stuck with are shady, whiney, grumpy, or annoying. Not easy to relate to is it. I wouldn't have complained about not seeing more of the other 4 if I was satisfied with these 6.
If you hate the characters, then just say you hate the characters, man. Don't dress it up with this loopy nonsense argument about background actors and character counting.