I like Alisaie because she seems like the type that can read people well. She knew almost immediately something wasn't right about Urianger when she came back onto the scene. If she doesn't like what she is seeing, she will express it in some fashion.

Plus the scene where she literally slays the WoD was awesome. I liked that she drew contrast there with her brother on battle style, not just personality wise. I've enjoyed her quite a bit. Alphinaud actually grew on me through Heavensward as well.