One thing that’s particularly interesting about Black Siren’s involvement on the upcoming season of Arrow is the fact that her morality appears to be in serious question.
Arrow has established that there’s at least SOME goodness in her that feels reminiscent of the old Laurel, while at the same time making sure to prove that she’s not going to take on the mantle of Black Canary — as we already have Dinah Drake in that role.
That leaves Siren in an unusual situation in which her allegiance could become an issue over the course of the next season.
She’s mostly a villain, but that always seems to be on the verge of changing, and being embraced by Team Arrow could soften her for good.