I love the companions(So far) and love their side quests, but it is kind of(Well, not kind of, VERY) disappointing that the side characters are there just for the mission and then POOF, gone

This is especially frustrating when we are used to be able to go back and check on characters(I mean, they are not the same type of game, but that is true for Oblivion, Skyrim, and the main quest characters as well) even for filler characters that have no consequence to the missions, like Hathia the lizard collecting Khajiit, she even has a spot outside Bergama that has a Landmark and all, and she has like 2 lines

I understand characters like Brahgas might be a bit more expensive to keep around(IDK, maybe? Maybe not?) but when you do the missions, both Aurelia(From Isobel's missions), Dimik-Ei(From Sharp's missions), The Veloises(from Isobel's missions), Jhaka(well technically all of Ember's friends), Irenni(Mirri's mom), Clairene(Bastian's sister) they ALL expressly say that you just gotta visit them some times, you created houses for Federo, Isobel's parents, and so many new locations, yet they all end up empty after said missions

It would be great to have all of the side characters just be around, and do repeating stuff like everyone else, walk here and there, do this and that, small stuff, but it would be an addition to the QoL of the game, instead of just having empty spots

I mean, even small characters, the Khajiit merchant you go and see while looking for Jhaka, he could just randomly be walking around instead of the normal merchants, and you could sell stuff to him, or have stalls in different cities
The drunk bosmer in Federo's place could be around cleaning and stuff
Isobel's parents just seating in front of the desk eating, sitting at the table eating(They invite us to dinner after all)
Arelia could be found in some ports some times

There is just the ONE character from a side quest that I have seen being around, doing the ONE thing, Sir Langley, sharpening his axe, but that is better than just poofing out lol

Little stuff like that would make a world of difference, rather than just have them poof out of existence

Please please please with sugar on top, add at least the "main" side characters around!