I need a brief history of Brynn...

I was laid up in bed yesterday with Norovirus and caught the last 4 episodes of the season, and whoooo what a wild ride! At first I didn't like Brynn, then I didn't like Ubah, then it switched, and then idk, and I wound up just not liking Brynn, but can't totally read all of the cast. Can someone please give me a brief history of Brynn?