7. Emma Watson
Of the three main Harry Potter stars, Daniel Radcliffe, Rupert Grint and Emma Watson, Watson seems on her way to having the most successful and acclaimed post-Potter career. She shined in last year's The Perks of Being a Wallflower and has a lead role in Sofia Coppola's latest film The Bling Ring, set to be released this year. She's definitely passionate about stretching her acting muscles and a big challenge she could take on would be playing a straight up villainess. Watson has the elegance and maturity to play Harleen when she's a psychiatrist and it'd be exciting to see her make the transition from a performance we'd associate with the demure Watson to a darklyy comedic and psychotic performance as Harley. While Watson may not be interested in becoming part of another franchise, Harley is so different from Hermione Granger that it wouldn't feel redundant for either her or the audience.