3. Ellen Page
Ellen Page's appearance in Super as Boltie, next to The Office star Rainn Wilson, shows she looks good in a costume (as well as playing Kitty Pryde in X-Men 3: That Last Stand and upcoming Days of Future Past, which is coming out next year), which already puts her well ahead of the competition with regards to an upcoming Robin roles. But seriously, Page's small stature and experience in action films makes her as a fantastic choice for Stephanie Brown, the fourth Robin. With the inclusion of Stephanie, it would present an opportunity to deepen the character of Robin, through her past as The Spoiler and being invited to the Bat-Family by Batman after her and Tim Drake, the third Robin, start dating. And Page has conquered many genres thus far: action movies, comic book movies, dramas, indie flicks, comedies... and yet, as she brilliantly showcased in thriller Hard Candy, she's also capable of playing characters with a noticeable (and frankly terrifying) dark side. When you consider all that together, it more than qualifies Page for the part. Cast her!