Wyll's kind of an egregious example of how late things were still getting altered because most (if not all?) of his voice barks are still his old voice actor's. And then we have the artbook still mentioning Daisy.
As for the characters in general, my main gripe is the sheer extent to how much of their personalities just boils down to sex. Maybe that's just human condition and it's actually a realistic portrayal or something, but I am kind of spoiled by the crews from PoE or KotOR2 or NWN2: MotB (there's a game that handles romance EXCEPTIONALLY well and weaves it naturally into the main story!) where you may have a designated sleazeball or two but it's otherwise an adventuring party, a band of (not so) misfits who have enough on their platter to fall head over heels for the PC after a compliment or two.
Meanwhile here we have Halsin, who I am worried got hit hard with a flanderization hammer after Larian saw that most of the discourse around him was about how desirable he is. I guess they got what they asked for, and everyone has to suffer for it. Then there's Shadowheart who makes it seem that Sharrans spent more time on one-night-stands than their cult activities, Lae'zel and the "hot githyanki girlfriend" line of dialogue which I still can't really believe got okayed, Gale with his ex-related angst, Wyll who's... ever-so-slightly dull, Karlach who feels like an isekai self-insert, and Minthara who is blatantly unfinished and is also primarily seen as an object like Halsin. I would usually blame Bioware (and still do), but this slips into JRPG territory, except westernized so it's neither wholesome nor pervy in a sometimes amusing manner but instead a bad romance novel/fanfiction.