There's many ways for expression to take place in the game. A pixel can do a lot. Text, Animations, Voice and still pictures/portraits. All tools for a more "representative" experience of the expression the Companion (or your character) is doing.
In the attachments below there are some Examples of what I'm flirting with. JRPG's and Anime use lots of "emoticon" stuff that might not completely belong in Project: Eternity (I'm personally not ruling it out, perhaps there is a way to make it super goed in a realistic and acceptable way).
Should the Character portraits included with the game also have a facial expression when you are "Choosing"? Instead of a "Red Text: This is a Renegade choice" versus the "Blue Text: This is an Alliance choice" it would be choosing your Dialogue Choice 1 through 3 depending on the expression of your character. Does he look menacing when you want to choose "I'll gut your stomach and stomp on your flesh!" versus having a more serene smiling facial expression next to the "Hey how are you?" choice
EDIT: Less voice-acting required as the bodily language is conveyed through the facial portrait expression, however it could reduce a few sentences of text in the Dialogue Log because the Writer wouldn't need to write the characters "expressions" every time.
Edited by Osvir, 12 November 2012 - 01:17 PM.