Who does everyone have as their mains in their party?

I'm interested to which companions people keep as their mains within their party as they are adventuring around and why. From talking to my friends, it seems we all have different preferred companions and I love hearing everyone's reasoning behind their choices.

For myself, Tav, Astarion, and Shadowheart are always on board. Then, I usually switch between Wyll and Karlach for my last spot. I would say Wyll is more often on hand because I find Wall of Fire useful.

I would say Gale is my least used companion (deepest apologies Gale lovers).

Astarion is by far my most used companion, to the point where I sometimes ungroup him and have just used him to pick off people from the shadows. Being a rogue with the advantage on bow attacks when hidden is my favourite way to fight