If you looked at the trailer, you can see a list of names that was given to Oliver when his father died. These are some of the,
Albert Davis - a Star City Millionaire and occultist who's plan to rid the city from crime goes awry. He was killed by Mia Dearden (Speedy).
David Drayson - Grew up in an area of Star City known as The Swamp. He was sentenced to prison for the murder of a police officer but escaped and took the name, Slingshot.
Hannibal Bates - known as the shape-shifter, Everyman.
Isabel Rochen - former Siberian servant who earns her way into wealth. Believes herself to be the true heir to Queen Industries and is an enemy of Green Arrow better know as The Queen.
Danny Brickwell - He is an accomplished underworld kingpin due to his brilliant criminal mind. He also take the name of Brick
John Deleon - The guy who bankrupted Oliver Queen.
Villians who will be appearing in the pilot
Constantine Drakon - A Greek assassin who kills for money, and an antagonist to the Green Arrow.
Tommy Merlyn - An expert assassin with the bow and arrow, Merlyn hires himself out for a hefty fee. Working with such villains as Maxie Zeus and Syonide he has battled Green Arrow and Black Canary on several outings. Also trained in the League of Assassin.
Adam Hunt - Corrupted business man (not in DC)
Theres a rumor that Deathstroke is going to appear, because someone who saw the extended version saw a mask of Deathstroke.