Sara Lance is a female Human who is a former member of both the League of Assassins and Team Arrow, she is the daughter of Quentin and Dinah Lance, the younger sister of Laurel Lance, the sister-in-law of Typhuss James Halliwell and the ex-lover/close friend of Oliver Queen.
After the Queen's Gambit went down in 2373, Sara was presumed dead. She was found by Dr. Anthony Ivo and spent time on the Amazo and Lian Yu. She was later found and recused by the League of Assassins. She joined the League and stayed with them for five years. She left the organization and returned to Starling City as the vigilante The Canary, a translation of her League name Ta-er al-Sahfer (Arabic for Yellow Bird).
Having eventually been released from the League of Assassins by her lover Nyssa al Ghul, Sara joined Team Arrow and began a relationship with Oliver. Sara soon rejoined the League as her part of a deal for their help in defeating Slade Wilson. She once more returned to Starling City a few months later, but was killed by Thea Queen, who had been manipulated and drugged by Malcolm Merlyn.
Over a year after her death, Sara was resurrected by the powers of the Lazarus Pit.
Sara has been secretly working for Helena Bertinelli, Diaz and Lex to destroy Team Canary and Star City. (Black Canary)