I don't know enough about Mirdain (or whatever but I like that name best) or letters and all the rest, but I will leap into the dark and say I'm the village butcher who loves to speak in doggerel. By the second day everybody'll want to lynch me for the doggerel instead of suspicion!
I like the Seer first night idea.
No dead people commentary on the original thread, makes sense to me.
I'm so new to this all that I don't think I could keep track of extras like special roles and letters and all that, so I'm going to vote "no" on all the other extras that have been mentioned.
Sorry.