You know her as: Thea, the troubled teenage sister of anti-hero protagonist Oliver Queen (Stephen Amell).
Why we like her: Who knew that the bratty little sis would turn out to be our favorite character on "Arrow"? Holland has chemistry with everyone, which helps keep us invested in her tenuous bond with Oliver and even has us rooting for her inappropriate crush on Tommy to work out. "In the same way that you're seeing Oliver come back to life in this series, you'll be seeing Thea grow up, and hopefully become more whole again," executive producer Andrew Kreisberg says. "At least that's the way we see her, and we hope that we can get the audience to really feel that for her, so you'll be less wanting to smack her, more wanting to give her a hug."
Where else you've seen her: Holland was the second (and superior) Kaitlin Cooper on "The O.C.," and she played a drugged-out teen model on "Gossip Girl."
-- Carina Adly MacKenzie, Zap2it