There is no question that ‘Arrow’ is known for introducing characters and developing them into their comic-book superhero counterparts, and taking their time in doing so. Over the course of the series, we have seen the show set up and build the characters of Barry Allen (The Flash), Ted Grant (Wildcat), Roy Harper (Arsenal), Tatsu …
Source: Holting The Line: Echo Kellum Discusses Suiting Up As Mr. Terrific In ‘Arrow’ Season 5