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Jafar says: Read my lips and come to grips with the reality!
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You think you can save this city. I got news for you, I own this city.
~ JJ to Mia Smoak.
John Thomas "JJ" Diggle, Jr. is a major character in the Arrowverse franchise. He is a mentioned/unseen character in Season 7's flash-forwards on Arrow, and the main antagonist of the flash-forwards of the first three episodes of Season 8.
John Diggle, Jr. is the son of John Diggle and Lyla Michaels, the nephew of Andrew Diggle, and the estranged adopted brother of Connor Hawke in the Post-Flashpoint timeline. In an erased future in 2040, he became Deathstroke and the leader of the Deathstroke Gang.
In the Possible Future in Arrow, he is portrayed by Charlie Barnett. As a kid, he was portrayed by Keon Boateng in Seasons 5-6 and Marcello Guede in Seasons 7-8 of Arrow.