User blog comment:Sladewilson53/Who will be in Arrow season 3/@comment-68.173.62.64-20140327060833

Harley Quinn has already been teased in the "Suicide Squad" episode so we know that she will come into play either late in the second season (doubtful) or in the third season

Nightwing is another very likely player to come into the series in either season 3 or 4. The mention of the neighborehood bludhaven has already been made and the easter egg of Harley Quinn. He wood actually bring a nice mix into the crime fighting team along with arrow, Dick and Oliver, two rich boys with insane martial arts skills, maybe a rivalry could even develop. The only problem with this though is that Oliver is around the age of Bruce Wayne and since Dick is supposed to be around 25 years younger it wouldn't make much sense because Oliver is in his mid twenties.

THE QUESTION as seen in justice league unlimited the animated series, the question had a relationship with the huntress and oliver. So huntress will have to get out of prison before we see his no face to come out but i have my hopes

Roy Harper will become an archer as in todays episode he was just called speedy to break him out of his rage but only after he looses the mirakuru or goes under serious training to control it which at this point doesnt seem likely to happen anytime soon

Ras al ghul will probably be making some kind of appearance as either an ending to season 2 or as a master villain like Deathstroke and the Dark Archer in seasons 3 or 4. This will also deal with Black Canary's broken pledge and maybe take her off the show at some point to allow more focus on characters like Roy and others.