Prior to last night's new episode of Arrow, executive producer Marc Guggenheim confirmed that the last remaining member of Team Arrow without a codename would finally get one. Was it Oracle as so many fans suspected? Was it Proxy, The Calculator's paraplegic daughter from DC Comics lore? None of these!
It turns out that Felicity's official Arrow codename is Overwatch. Which is somewhat ironic as Guggenheim previously released a novel titled Overwatch. Besides channeling The Flash's Cisco to come up with Felicity's codename, Oliver had a Deadpool moment, breaking the fourth-wall and stating that he would have went with Oracle but it was taken.