I would like to see Helia, too, or Barcus. I think we definitely need a smaller companion in our party as well.
I know that some changes would have to be made so that Barcus could be a companion. He didn't seem to be infected when we've met him in early access.
But maybe the interaction we've had with him is not the final version, and he has a tadpole as well - he could have been kidnapped when he was searching for his friend Wulbren. I know, that are a lot of ifs.