The companions have actual relationships with each other instead of merely pretending to care by just asking each other about where they're from. It's the one thing that sets the Pathfinder companions apart from most other cRPGs, and makes them feel a lot more organic than most.
It's not just Larian that should be taking notes in that department, pretty much every RPG developer should.
The side commentary is great too.
You are speaking with someone and one of your companions interjects with their own comments before you reply. And its great 🤣.