One thing that cemented my love for Wyll as a character: Grymforge.
Imagine actually going into that place as a gnome Tav. The guards sneer at you. Everywhere you look, your people are dehumanised and treated like livestock. Two duergar toss the bodies of dead gnomes into the lake as though they're just trash.
Astarion sniffs that at least the slaves are just gnomes. Shadowheart snarks that you surely have something better to do than waste time praying over the bodies of your people. Gale is keen to keep the peace no matter what.
Wyll, though?
Wyll is incensed. He's outraged. And if you so much as think about attacking the duergar disrespecting those bodies, Wyll moves immediately into backup mode. The Blade needs a break? Fuck that now, he's encouraging Tav to burn this shit to the ground to get vengeance.
I love him so much for that.
