Even tho I've never been the biggest Black Canary fan from the comics, I feel like there's a lot of potential for her in the big screen; actually I'd love to see both Green Arrow and BC in the big screen interacting in the classic comics way (or how I read they're doing in Rebirth); I like the Arrow show and I really like Amell, but I wanna see smartass Ollie fighting and shooting awesome trick arrows (that a movie budget allow better than a TV budget) and Dinah kicking ass and using her "canary cry".
Not sure if I'd want'em in the League tho; I know both of'em have been part of the League at different points in the comics (hell, EVERYONE's been part of the league at different points), but I kinda like the idea of Batman being the only "normal human" that can put himself at the level of these "gods".
I'm actually envisioning a "Dark Knight" type, street-level crime thriller movie with GA and BC, them riding their bike and fighting thugs and what else; I think a crime-fighting duo which is also a romantic couple could bring interesting dynamics and something new to the CBM genre.
Sorry if this is off-topic, I'm not quite sure now...