Yeah, I picked my first character purely based on what I wanted to play, but the default classes of the companions is weighing on what I'll play next time. Rogue is one of the options I'm considering, but I'll definitely be taking Astarion (because I didn't last time) so I'm not sure if I'd want two rogues.
CHA is good for the character who'll by default be leading conversations, although presumably you could have (let's say) Wyll act as the face of the party by clicking the Change Character button when you get into a conversation?