Honestly, it is kind of hard for me to picture party banter since most of our companions do not really feel like a part of a solid unit/do not have much to them.
Brint is a simple horn dog, Brienne only really has interest in champ, no one likes Quin, Kiyoko does not want to interact with anyone, Viv is off doing her own thing and I am still not sure what Atugia is even about
It only feels like Cait, Arona, Ryn, Azy and Agni feel like they have opputunity to interact with everyone without it feeling jarring/it feeling natural. That is how I feel.