In my first playthrough, I'm going to minimise killing that's not strictly required in order to help whoever my PC wants to help. So Minthara might die if that's still a requirement for helping the grove and the tieflings in the full release, but everyone else will survive as long as they don't force my PC into a corner, and she'll bring as many along with her as she can.
There are no companions so far that I'd rule out for future playthroughs, though, and I've found something to enjoy in all of them. Minthara is the one I'm least fussed about, and so far I've been immune to her charms that have clearly captivated many other players. But then I only helped her once in EA so didn't really get to know her, and I guess she could grow on me if her story in the full release is interesting, and there is the potential there for a different perspective and different alliances.
"You may call it 'nonsense' if you like, but I've heard nonsense, compared with which that would be as sensible as a dictionary!"