Quentin Lance is a former detective on the Starling City police force who was demoted back to beat cop after the events in "Sacrifice." He is also the father of Laurel Lance and Sara Lance. 

He was once committed to bringing down The Hood at any cost, but after The Undertaking he had a change of heart and has started to work with The Arrow (a name he decided better fit the vigilante) to help him fix the broken Starling City.

Quentin Lance Quotes

You sent Felicity Smoak to warn me to leave town. You know The Arrow. You're the girl in the mask. You've been kicking the crap out of creeps in The Glades.

Lance

Warrior: Guns are a coward's weapon. What are you without your sidearm?
Lance: A guy with a spare.

Arrow Quotes

Oliver Queen is dead, eventually to be reborn as Ra's al Ghul. For now, only the Arrow, Al Sah-him, shall remain. Al Sah-him, Heir to the Demon.

Ra's al Ghul

Ray: Advanced Technology Operating Mechanism. ATOM.
Felicity: What are you going to use it for?
Ray: To protect the people of this city. And I want you to help.
Felicity: Why does this keep happening to me?