Arrow has no doubt been a major success on the CW, pulling in some of the network's highest ratings, but who else can succesffully join this universe? Barry Allen has already made an appearence on Arrow and is currently filming its own pilot to hopefully launch the show on air. Who else can the CW plausibly use* to further their television universe?
*I say "plausibly" because WB would not approve a Batman or Superman TV show while the movies are going on*
1) Suicide Squad
The Suicide Suqad is soon tto be featured in Arrow, much to fans' pleasure, but can they hold their own show? I say yes! When you think about it, the Suicide Squad could be a much more interesting version of Agents of SHIELD. Even keeping the Arrow line-up of Bronze Tiger, Deadshot, Shrapnel and (assuming she is the mystery girl from the episod's trailer) Harley Quinn would show great diversity and a really cool dynamic between the characters. Harley's whimsical nature next to Bronze Tiger's sterness next to Deadshot's bloodthirtyness would make for some great interactions. The Suicide Squad would simply be a smart choice on the CW's part.
2) Zatanna
The world's greatest sorceress definitely deserves her own show. First, DC and the CW could introduce her through Arrow pretty easily as they are now trying to expand their world out of the super realistic and into a world with super strength and speed; I don't think magic is too far of a stretch. Also, Zatanna offers some great visuals and, with the right special effects crew, could take on a level of fantasy that the CW has never really reached before. This is 2014, visual effects have come to a point where you can learn quite a bit just through YouTube. Finally, Zatanna offers a pretty hefty rogue gallery with the likes of The Demons Three, Allura, Circe and Enchantress. Zatanna could spark the interest of a lot people who have left Arrow due to its uber-realism.
3) The Question
My final choice for a CW TV show brings back the reality of the universe; The Question. I could perfectly see this show being like CSI meets Sherlock. The Question is one of those underappreciated background characters that shows his genius whenever need be, but the concept behind him is perfect for a television series. Can you imagine a Question vs Equinox season? Or even to stretch it even further Question vs The Court of Owls? There is so much sophistication that would have to go into writing this show, but done right it could be a lot of people's ticket into the DC universe.
There's my list for which characters I would love to see CW shows for. I would like to mention that I love what the production teams for these shows are doing as they hop from one show to another, introducing an already established audience to a character before setting them off on their own. It gives viewers a sneak peek at what could come. Keep up the work on Arrow and give us a great Flash show CW! If you have any other ideas, I would love to hear them in the comments.