Very soon into the development process, though, Timm realized that he needed more diversity. Plus, he did not want the Justice League show to really be seen as a continuation of Super Friends, so he replaced Aquaman with Hawkgirl to give the team another female member and he replaced Hal Jordan with John Stewart to give the team an African-American member.
This became the classic lineup for the Justice League, along with Flash, Wonder Woman, Batman and Superman.
However, before they had even worked out the designs for all of the characters (John Stewart wore a mask, for instance), Timm had animator James Tucker put together a quick pitch video for Warner Bros. At this point, they had decided to change the lineup once again! They knew that KidsWB were interested in younger heroes, so he had Robin, Impulse (who would be replacing the Flash) and a new teen female version of Cyborg join the roster, giving the team a nice mix of adults and teens!
As it turned out, though, WB approved the Justice League pitch over the phone, so Timm never had to use the Tucker-created pitch video, and thus they did not have to commit to using the young heroes, so they went back to an adults-only League (that sounds dirty).
