Moira Queen
So Moira queen (Sussana Thompson) is also confirmed for the 100th episode.
http://www.ew.com/article/2016/09/29/arrow-susanna-thompson-100th-episode
Arrow looks to be pulling out all guns for the 100th episode.Just the other day i saw some members posting that the show's so bad now that Sussana won't even be returning for the 100th episode.So there you go.