I have definitely had romance banter organically triggered from Karlach and Lae'zel and some of them are presumably only triggered in a specific party composition and walking at a specific point of a map, whether its suppose to be more random or not I wouldn't know.
Two romance banters thast I remember, one requires you to have Lae'zel and Astarion as your active party members and somewhere between Blighted Village and The Grove they have a romantic banter that gets triggered. Another instance of Karlach's romance banter is only triggered if you keep Karlach and Halsin as your active party members and walk through the halls of Stone Mason building in Act 2 and I can totally see there being unique romance banters that has not been discovered because of lack of a specific party composition at a certain point of the game given just how many variables you can mix your party composition into and walking them through in the view of the whole game.
In most of my playthroughs I admittedly always get stuck with Karlach, Lae'zel and Shadowheart as my most kept party composition so there is a lot I miss out from doing so, if you pay attention and listen to this clip.
Its been seamlessly compiled as if one massive single group banter, but hearing how certain party members response to each other gives away which ones you should keep as active if you want to enable yourself the chance of having them triggered at some point in the game, but given how there are banters between Karlach and Shadowheart I 've never managed to trigger and them being the most used in my team, is it safe to assume most of it is just unavailable in the current build of the game? I would feel inclined to agree so.
My last playthroughs for trying to discover anything new for Minthara my party composition has mostly always been " Minthara, Lae'zel, Shadowheart" withouth much thought to it, anyone cares to share what your combination has been with Minthara in your party?
