At first, I was happy for people that wanted Halsin when they got him in the game.
But the more I play, the more I want him out of the game. He doesn't belong as a companion.
He should've just been a camp follower like Volo, but one that you could at least romance, who later leaves the camp after Act 2, seeing as did what he needed to do, he outlives his usefulness once he follows you into act 3, like dude your job is done and you clearly hate the city of Baldur's Gate like a disgusting hipster.
I'd be fine with no romance, either, after all, he seems perfectly fine with "conquering"
