Quiggle

"It is because of you that the Green Arrow exists"

- Oliver

Quiggle is the slash ship between Oliver and Diggle from the Arrow fandom.

Canon
2010

Diggle works private security at a mansion where Tommy throws a birthday party, and Oliver, visiting from Hong Kong, briefly sees Diggle talking to his brother.

2012

Oliver returns to Starling City and Diggle is hired to escort Oliver around town as his security. Oliver quickly learns that Diggle is not like his previous drivers, but a smart and capable man who has little time for any rich spoiled shenanigans. Once Oliver realises he can't be the Hood by himself and needs assistance, Diggle is the first person he reveals his secret to. Diggle's past as a soldier in Afghanistan as well as some medic training makes him an invaluable partner in Oliver's war on crime. Dig's grounded perspective also checks Oliver's tunnel visioned or impulsive nature and provides perspective that slowly lures Oliver back to his humanity.

In spite of the unlawfulness of what they do, John confesses to Oliver that his time in Afghanistan made him question whether he was a good person, how to clearly do good in a world filled with corruption and that Oliver's mission is the first thing that's made him feel good since returning from war. Oliver has great respect for John and they also spend time together at Big Belly Burger and are privy to each other's personal lives. Oliver learns that Diggle's brother Andy was murdered by a hired assassin called Deadshot and how Diggle spends a lot of time with his nephew and Andy's widow, Carly.

2013 The guys develop a brothers-in-arms intense friendship and trust and work really well together. Their friendship is first put to the test when Dig's former mentor from Afghanistan shows up and is on the list. Diggle defends his former mentor from the vigilante, but comes to learn on his own that the man is in fact corrupt. Oliver comes to Dig's aid and they mend fences, a stronger bond between them because of it.

Oliver reveals to Diggle that he is a Captain in the Russian mob — The Bratva. Although perplexed by Oliver's hitherto secret affiliation with a gang, Dig agrees to assist in a mission to reel in The Count with intel from the Bratva and saves Oliver when he's injected with Vertigo.

Fandom
AO3

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Quotes
"You can be a better leader and a better hero, than I ever was"

- Oliver