Honestly, kind of the same sentiment as papercut_ninja.
There are technical limitations, I’m sure, but it’s also nice to voice those preferences (since they allow for interactions and suggestions). If only because it gives maybe a better idea of what people can enjoy and focus on (for this game, others, for mods, etc.).
Astarion was the companion that mostly interested me when I started playing (in EA and then after release). Most of all in an evil run. I like that, to me, it’s complex where the story goes with him. I’m probably going to always remain generally not that satisfied with it in its entirety and branching, but that’s a me problem mainly. That said, yes, I can imagine a variety of nicely marked expressions to have, that one too.