I enjoy the companions quite a lot, I think one of the reasons why is the way they've handled the aligments.
I've got to commend Larian for avoiding the usual alignment pitfall, namely turning chaotic evil into chaotic stupid, or lawful good into lawful stupid.
With the above, and Oath system of 5e in mind, I am very much hyped for a Paladin companion. Hopefully we will get LN, or maybe a little bit more chaotic one.
Lae'zel can be bossy to the point of being annoying, but that's frankly her lawful part of the aligment. She sticks to the protocol, and what she was taught in martial obsessed society. Having done a bit of her quest, I hope she will evolve along the way.
Shadowheart I've disliked at first, but when she started warming up a little, I'm actually interested about the most.
Her aligment is probably NE ?
Gale is somewhat boring, his affliction aside. But it's good to have him around, to counteract the overall brooding mood of the party. Although I am unsure about his aligment. Strikes me as either CG or CN ?
Astarion I have not traveled with yet, but I've definitely enjoyed his conversations in the camp. Definitely Chaotic Evil aligment wise, which honestly is the high point of the BG3 alignment "system".
Wyll, he much like Astarion awaits for the second playthrough.