Halsin... I don't dislike him so much as I don't really acknowledge him. He sits in camp and has that one quest and beyond that he's not really a thing.
Wyll is annoying, since he likes to cry about everything "Oh woe is me, I have a pact with a devil that I made willingly" "Oh woe is me, turns out devils are mean" "Oh woe is me, my dad who disowned me because of my pact with a devil is in danger". As well as his weird, creepy "Hit on all the girls" banter...
But, my least favourite has to be Gale. Because despite his nice demeanor, his entire situation was caused by his narcissistic arrogance. He literally had it all, the vast expanse of the weave (Available to mortals), sleeping with a literal goddess, friends with Elminster. But he decided he wanted more. Enough to disregard Mystra's wishes (Showing he didn't really care about her, or at the very least, cared about his own wants more) and try to access the parts of the weave forbidden to mortals.
Then he turns around and starts flirting with you. "There's few I'd consider special" I bet Gale, because you care about yourself more than anyone else. At least Astarion has a reason to be self-centred, he spent several decades being tortured as a slave to a Vampire. What's your excuse Gale?
