Board Thread:Arrow discussions/@comment-33402819-20171124071716/@comment-24152851-20171127005529

That is one of the more... creative theories I've seen on doppelgangers.

The only way I can see Black Siren being redeemed is if she had been brainwashed or conditioned prior to appearing, and they remove the brainwashing to get to her 'real, closer to E1 Laurel' personality.