I've had a few scenes with the Bounty Hunter that if the right choice was taken it gave a hint towards SGR with Mako (at least from the BH side), but it's like one line dialogue then goes off to standard dialogue.
Didn't see any of it for Inquistor and Ashara.
All others aren't at spots to see the dialogue with possible SGRs.
Sad that Ashara is the only female companion for SI. I'd rather eliminate her than romance her. I think it is a good start to have the option on NPCs for now. MY SI would absolutely romance someone (male or female) just to meet her personal goals.
We can see how it is received with NPCs and maybe then decide to put resources into more complex companion stories.