Are there any companions in the game who are not also origin characters?
And/or are there any origin characters in the game who don't have tadpoles in them?
Are there any just normal ... companions, who are along for the story with you?
As far as we know it’s No, No and No. I think that Camp followers and reoccurring characters and temporary party members are the closest that we can expect to see.
Making a character an origin means that we need to be able to start a game as one, so I find it unlikely for one to not be tadpoled - a non-tadpoled character would require a different intro and tie to the story. So far it seems that tadpole is BG3 equivalent of source from D:OS2 - it is source of playable characters status as “the chosen one” and main driving force for the narrative. Tadpoles are also tied to games core features and many interactions.
Nothing was said about plans to add “normal” companions later in the game. There are likely to be “mercenaries” like in D:OS1&2 but not much more then that.
