Emiko's true intentions were the main focus on Arrow Season 7 Episode 17, and while I appreciated the new twist added to an otherwise dull character, getting to this big reveal left a lot to be desired.
Arrow Season 7 has had a lot of fun elements going for it that made it stand out as one of the show's best seasons. However, Emiko was not one of them.
The New Green Arrow mystery and the half-sister reveal had a ton of potential, but most of it got squandered after the introduction on Arrow Season 7 Episode 10.
Related: Arrow Season 7 Episode 16 Review: Star City 2040
Similarly to Dinah, her character felt forced into the show, and she hadn't made much of an impact since her big arrival. Multiple times she would pop up and not do anything.