Greg Berlanti helped clarify when asked directly if the potential addition could be based on Arrow recurring player Brandon Routh's DC character Atom/aka Ray Palmer.
"We're in very early talks in a very general idea that we haven't gone deeper on yet," Berlanti told reporters, with Routh noting he would like to continue with the role.
"When [the Arrow role] was proposed, I was hesitant to step into DC world again,” Routh said. The actor first donned Superman's cape in 2006's Superman Returns.
Pedowitz, whose schedule is lined with three DC shows in Arrow spinoff Flash and an adaptation of iZombie, noted that there's "room for a lot of things" on his schedule and that genre is clearly working for the network. (Freshman The Flash, already renewed for a second season, ranks as The CW's most-watched series.)
This could be over kill with CBS already doing a Supergirl series next season. Not even really feeling his character outside of him being a romantic interest for Felicity on Arrow.
Anyways, I honestly don't like the idea of Atom being in Arrow. I feel like he's too supernatural to be on the show. (They did say Arrow will remain grounded from all the major supernatural stuff, and I kinda like it that way tbh)
However they didn't hesitate to have the flash on it.
I don't really find Ray Palmer interesting whatsoever, so maybe a spinoff might be a good idea to get him off the show.
Eh, Ray has been really poorly handled on the show. The entire character has been awkwardly written and has come across as naive, stupid and creepy. I like the character in the comics but I don't think he would be my first choice for a spinoff.
Arrow creating new hit shows for the CW. 
The CW are doing anything to become a thing! 
most of them being SV clones 
