Olicity

Olicity is a het ship between Oliver Queen and Felicity Smoak in the Arrow series.

Canon
To begin with, Oliver and Felicity's relationship consisted of minimal conversations and Felicity's hacking skills were used to assist Oliver on various missions as "The Hood". Although, Felicity didn't find out his secret identity until later. Oliver found her amusing on several occasions; most notably their first meeting. They first met in I.T. Department of Queen Consolidated. Upon introducing himself, Felicity accidentally mentioned his father's death, backtracking apologetically and ending up babbling at him. This amused Oliver. To her relief, he ignored her ramblings and gave her a bullet-ridden laptop, claiming that he'd spilled a latte on it, though she clearly did not believe Oliver's cover-story.

Oliver's pleas for help from Felicity happened multiple times, even managing to undercover plans for an armored-car robbery.

Trivia

 * Olicity won the "Ship of the Year" award in the MTV Fandom Awards 2015. Emily Bett Rickards published a small video in response to this, expressing her gratitude for the fans.
 * In 2015, Olicity was the fourth most reblogged ship on Tumblr.