The thing with 4 characters is that you are kinda forced to take specific members. In my playthrough I feel forced to take Shadowheart, Astarion and Lae'zel because they add something I need like a frontliner and healer and a rogue that can lockpick and find traps. But I would really rather hang around with Wyll and Gale which are much more nice and friendly and interesting to me. But in a way I feel I can't because then combat and exploration will be really really hard.