I absolutely do not want my protagonist to be voiced. The current two male voices sound nothing like how my character sounds in my head, and whenever I play a game with a voiced protagonist I immediately stop feeling like he is MY character because he will sound different and have different inflections and thus vocal reactions to what I hear in my own imagination.
On top of that the more voiced dialogue the fewer options in the dialogue we can expect. We already had tags for race and class as well as different dialogue options for persuasion, intimidation, and deception checks. ALL of that would need to be voiced by every single voice actor, and that gets expensive fast.
If we get fully voiced protagonists we can pretty much give up on sub-class tags, background tags, god-related tags for clerics and paladins, patron tags for warlocks, and just all around more branching paths we can choose in the game because the more dialogue options they add the more expensive fully voiced protagonists become.
As for general demeanor? I'd honestly love it if we could get like... "Confident", "Kind", or "Cruel" tags that determine our character's expressions and general body language. Playing an evil Githyanki was awkward when he struck a Superman pose and smiled every time he met a new person.
Agree with all of this.
Most of the time I have sound turned off in games with voiced protagonists because they sound so fake. Even then the subtitles still make me cringe because most of the time my character would never say whatever is being said. There are way too many races, classes, backgrounds, practically everything that would affect the way someone would sound, these will be impossible to get right for everyone.
Demeanour tags I would like to see to help with the facial expressions and poses. This should be separate from alignment tags, being forced to be a perky light hearted "good" character or a scowling "evil" character all the time would be lame and unimmersive.