I don't understand the thinking behind wanting Wyll to be more of a hardline monster hunter traditional lawful good coded guy. One of the very best things about him is how he breaks that stereotype - because he IS for goodness and justice and battling evil where'er it lurks! But it's the kind of Good that knows Hurt People Hurt People and not every monster has to remain so. He's a man of nuance who always, always, always gives "monsters" the benefit of the doubt so long as they're not actively threatening innocent people.
[I'd have taken her head if she spoke to me like that.]
Wyll: I try to avoid summary execution when a sideways glance will suffice.
Astarion fucking bites him - Wyll, the Blade of Frontiers!! a renowned monster hunter!! a man who, by his own admission, has slain vampire spawn before!!!!! - and what does he do? Calls him insolent but charming, says he got the best sleep he's had in ages, compliments his hair and tells him to keep his fangs out of innocent people (notably he does not actually tell Astarion to keep his fangs out of his neck.... unlike everyone else in the party).
He travels alongside, has a lot of respect for and great camaraderie with Lae'zel (militaristic space pirate whom everyone on the Material Plane shits bricks upon seeing) and Shadowheart (ms. when i grow up i wanna be a dark justiciar in a nihilistic shadow cult. maybe do a blood sacrifice idk) and Karlach who he was sent to kill but didn't (unless you did the thing. I did Not) because he decides her life is more important than the inevitable torment he'll face for disobeying Mizora.
He's sooo, SOOOO much more interesting this way than as a Lawful Stupid "why aren't we killing these undead/abominations/astral invaders already alfjakghjkk >:(" hardline smitey ur-paladin fucker whose character arc is learning that oooh monsters are people too oh wowow because he already knows that!!! He already knows!!!! His character arc isn't about acknowleding that monsters have feelings too, it's acknowledging that he has feelings too and is worthy of the same consideration and benefit of the doubt he extends to everyone around him!!!!!!!