I keep seeing people saying we get evil first so expect them to be abrasive and unlikable. The best evil people are super charming. They're just selfish. Astarion is actually a great example of this. Shadowheart isn't even really that evil, and seems to be evil despite herself frankly, and I'm guessing the story will explain that in such a way that she isn't even bad. Nonetheless, Laezel makes perfect sense to me. I mean look at the other Githyanki we meet. Damn!