From supervillains to scarlet speedsters, 'Arrow' season 2 seems to get bigger and bigger with each passing day. The CW DC drama has already cast a plethora of new stars in its sophomore season beginning October 9 but has made a real 'Killing' of its latest casting in AMC breakout star Bex Taylor-Klaus. 'The Killing's former Bullet will crop up in Starling City opposite series regular Colton Haynes (Roy Harper), but what famous DC character might the young star play, and what does it mean for season 2?

According to The CW sources, young Texas native Taylor-Klaus will take the DC Comics role of "Sin," known in the books as a groomed successor of Lady Shiva and eventual adopted daughter of Oliver Queen and Dinah Lance. 'Arrow''s version will see Klaus recurring in the third and fourth episodes of the new season, described as "a wayward youth who is befriended by the Black Canary and has a connection with fellow street urchin, Roy Harper."

The DC character was also known for an association with the League of Assassins, whose presence had been teased through Malcolm Merlyn (John Barrowman) in the first season. Taylor-Klaus had recently been photographed on the Vancouver set, looking far less youthful than her 'Killing' counterpart and being chased through a used car dealership opposite Haynes. It certainly seems as if the character's fighting skills and agility have been left well in tact.

In addition to teasing Metamorpho, The Atom and The Flash, ‘Arrow’ season 2 will pick up on October 9 some time after the events of season 1 finale “Sacrifice,” continuing its ‘Batman Begins’-influenced storytelling with the addition of new villains Isabel Rochev (Summer Glau), Brother Blood (Kevin Alejandro) and Bronze Tiger (Michael Jai White). Guest stars Colton Haynes (Roy Harper), Emily Bett Rickards (Felicity Smoak) and Manu Bennett (Slade Wilson) have all been upgraded to series regulars for the second year in Starling City.

We'll bring you the latest on 'Arrow''s second season and Klaus' role as Sin, but in the meantime, what say you? Are you interested to see Roy Harper get more heroic this year? Give us your 'Arrow' season 2 dream casting picks in the comments after the trailer!

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