In Arrow S05E05, Tobias Church hires a vigilante to kill Green Arrow.
He even attempted the deed:
But who is this vigilante, is he some straight from the comic book character like Human Target or did he just come out of air for the show?
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As far as we can tell, this character was invented for the show, though the writers don't seem to think so.
In the end credits, the character is identified as Scimitar:
Although the writers claim that this character is a "big DC universe character", there's no DC character I could find named Scimitar. There is a Marvel character named scimitar that bears some resemblance to the character in this show, but I doubt that's who they intended.
It's also possible they just got the character's name wrong.