NPCs Likely to Be Squadmates in Next Game

I agree that Bain and Reyes are the two most likely ME:A candidates for future Tempest duty. I can see Kandros as well, but I think they would keep him busy with APEX missions. I think we will get a new squadmate in the forth coming DLC (which would be for the DLC mission only), whom is likely to be Quarian. Also, the other Pathfinders could become mission available for a short time like Wrex in the Citadel DLC.

One other option, though highly unlikely, is the other Ryder twin. There's a lot of potential for narrative drama but I'm not sure the writers are up for it. I'm mean what would your twin be doing? Technically, their SAM should amp up their abilities just like their sibling.

I want Saelen Varn, the Salarian spy with Brandon Keener's voice. It's time for another Salarian squadmate. Also, Brandon Keener's voice.

I'd also love to have Avitus Rix, but understand we can't because

Would still like to romance him as Scott, though.

Avela Kjar would be cool, too.

Conrad Verner and Niftu Cal. I settle for nothing less.

I support Kandros, I support Bain (though I didn't like his character model in the game - a few other npcs especially the merchants looked exactly like him as well. He should look more like an individual person & stand out more in his design).
Others than that maybe Kallo, I don't have that much memory of any npc that stood THAT out to me I must say.
Hopefully a Volus and I hope the Quarians will find their way into the squad again. Would be okay with any kind of Remnant as well (if the maybe/maybe not sequel plays in Andromeda).

I kind of like the idea of SAM being able to download himself into a Mech or something; or maybe a little hover tank you can send into places to do the really mucky jobs.

Bain Massani, definitely.

I wouldn't say no to Kandros or Bain if they wanted to join.

Eh, the NPC's I actually like I'd prefer if they remained leaders of their own respective groups or get groups of their own. I'd only want them to join up temporarily, like Aria in the Omega DLC.

His contribution is basically a nickname. In my first playthrough I actually wiped out the kett base and the smaller camp below before I came across that guy. 

I doubt Reyes would be in since all the human squadmates tend to look very unique and have face model. If they suddenly scan a new face for Reyes, he would be a different person. It's like Zevran looking so different from DAO because of the engine changes.

I could see some aliens outside of the Asari becoming a squadmate though.

Kandros

Avitus Rix

Kesh

Bain Massani