We've only discussed characters so far really. I pitched a few ideas for my own, which I've narrowed down to the following:
-Sagar Ivo (I will be adjusting his age to make him more suitor acceptable)
-A servant girl who is having an affair with one of the twins
-An old woman who is knowledgable and experienced, sharing stories of the past and was alive before the last dragon passed
-A Pallave heir, possibly the twin that is not having the affair
I'm unsure if you read Terebinth's idea for the twins, but it is on page 2 I believe.
We haven't decided much plot aside from later on throwing in magic once the couples are situated and things like that. The old woman will become a lot more important later on if we decide to go down that road.
I believe that's it lol. The heir I plan to make does not have to be the twin unless, you, Tea, decide that you want to make him or whatever lol. It doesn't really matter to me.