4. Logan Lerman
Logan Lerman recently came into the spotlight in a whole bunch of movies, most noticeably in the Percy Jackson series and The Perks of Being a Wallflower, which also starred Harry Potter actress Emma Watson. An actor from the age of 5, Lerman has had a long and successful career and has amounted a large and ever-growing following in recent years. Looking at his past roles, it's clear to see that Lerman has no issues with diving into characters with who are emotionally unstable, as witnessed in The Perks of Being a Wallflower. Due to the long tradition of the character of Robin being an orphan, then, Lerman would be an apt choice, given his talent for emotionally driven moments and a natural tenderness (rather than the revenge-filled, "I'm too cool to be sad" Robin we saw back in 1995 with Chris O'Donnell). Due to Lerman's short dark hair and his being shorter than Ben Affleck (who is Batman, in case you didn't know), he already has the Robin look down. This could leave him open to play any of the first three Robin incarnations: Dick Grayson, Jason Todd or Tim Drake. Take your pick, Mr. Lerman.