I’m definitely partial to Wyll as well, but I feel like Shadowheart and Lae’zel have similar stories of disillusionment with their beliefs. I guess I prefer Lae’zel because it takes Shadowheart so so long to open up and feeling more honest. Lae’zel is rude, but you know where you stand with her (below her, heh).
Wyll and Karlach are a great pairing, too. They have run in similar circles (pun intended) and their fates certainly seem intertwined. Wyll’s story is one of the more tragic ones, too. It’s like he could have been destined to be a paladin, but made a bad deal and end up a lawful(?) good warlock.
I still haven’t really used Astarion because he reminds me a little too much of Dennis from It’s Always Sunny in Phildalphia and he just seems insufferable.