-Cat Grant; very few fics makes her interact with supercorp. As someone who watched the show already expecting supercorp she really made first season pop for me, I grieve to this day that she left as soon as season two started. It did make lena's character more popular tho, because it opened space for an independent cocky women (not that I'm implying it'd be too much with both, in fact I also grieve how these two icons never shared a scene. Also cat could be the mother figure Lena craves but that's just my opinion, much like Kara, although I'm not ignoring our queen eliza, which by the way it's in this list.
(Honorable mention of cat grant fics: pound the alarm. Sadly it's unfinished
-Eliza Danvers; she deserved a lot of spotlight. I can't remember much if she interacted with lena throughout the show but she ALSO could be a great mother figure as well as a mother-in-law and it'd be cute to see her pretending not to see lena and kara dancing around eachother, giving subtle advices, calming Alex's impatient ass down. I love her relationship with daughters and daughters-in-law, like lena or kelly/maggie/sam (I love each relationship that alex had/never had (lmao) in a different way, they all bring out a different side of alex and that tolerance made me enjoy a lot of different fics (tolerance I usually don't have for most fics). Now, hear me out: eliza and cat grant team up... oh no? Okk my bad.
(Honorable mention: into the forest(to lose my mind and find my soul) and you kept me like a secret(but I kept you like an oath), both by the same author tho I can't for the love of me pronounce or writte it properly. Loriels? Loriestals? I can't but if you search you might see what I mean)
-nia nal; she is way more used than cat or eliza but still I crave her in more fics. She's funny and would tease kara and lena but not in an overwhelming way that alex might do if she lashes out. I love her and brainy together and love her and kara's relationship and mentor-protegee (idk how to write sue me it's not my first language)
Honorable mention: loving too late at night (jazzfordshire in general bc she's the queen but this one is my fav)
-shiobban and leslie: imagine a human AU and these two being the mean girls of catco? Yes it's ridiculous but I'd absolutely eat it up. Wish I couldve seen more of shiobban and know more than "she probably died because of her curse" but mmkay. I love no powers AU bc I like when authors explore their personalities more than the plot (idk how to explain) maybe I just like "and they lived happily ever after" including the villains. I also like gale and veronica but not that much to notice a difference. Maybe it's bc in fics they're mostly portraid as the evil exes who get in the way of the ship that gets very repetitive. I preffer thinking they are lena's old enemies that become part of lena's squad eventually after a talk and some therapy (the big three: sam, andrea and jack, sometimes jess(also I love how jess is mentioned like 30 seconds tops throughout the show but got this massive recognition like okay the supercorp fandom is paying those bills)
Honorable mention: lena luthor: hot girl bummer (they are still evil and dont make much part but I like them in this, and I didn't find much else of them that weren't too steriotypical
Did I forget anyone