I think Alfira as a bard companion would be a nice addition. I'm also curious about that Helia werewolf-halfling, she sounds nice and reminds me of one of my player's characters(halfling barbarian, had encounter with werewolf during our campaign). From the characters we already have... I think Barcus(as possible artificer) and Rolan are also solid candidates for companions and they have personal quests that would go perfectly with that purpose!
BArcus would actually make a lot of sense as a companion, since his story arc spans through the whole three acts. Plus he is a great character.
