I wonder if these aren't temporary companions files. The full companions will all be origins, that is, selectable at player creation as your playable character.
Karlach works as an origins (outside her class, as we already have a fighter), but her dialogue sound like a lots of other NPCs that tells you to meet them in Baldur's Gate after your are done with their current quest.
Going by a post on Reddit that mention more info about these. Helia = Haslin. Different gender and animal shapeshift, but both are being harassed by goblins kids throwing stones at them. Haslin is clearly not an origins option.
I really doubt Minsc is going to be an origin. He has NPC written all over him.
If you would look at the actual files you can see that they have as many reactions and scripts as the already revealed companions, nothing suggests that they are just quick placeholders.
