My general thoughts on the characters:
1) I hope that the ability to influence some of these character's personalities manifest's itself in the later Acts, at least if you've the Charisma and Persuade to support it.
2) The current one's suffer from special snowflake syndrome, though that isn't inherently bad in itself if they are mingled with a wider cast, it becomes a problem if they are *all* this way. It can feel like they're trying to steal the show from the PC. I think part of this might be because they're intended as origin characters, but still... since I believe Larian has said more characters will be implemented I'm hoping this gets drowned out.
3) Shadowheart should have her AC problem fixed.
4) I don't mind that they lean into edgelordism, but to echo point 2, this'll be a problem if the later additions turn out to be the same.
I was literally going to make a post about this. I am so sick of the perpetually pissed off NPCs that always have to have the last word/be super clever and snarky.
This.