As Once Upon a Time prepares to end its exciting third season, fans of the show are now faced with all the potential goodies in store for next season. New characters, a brand new story and the promise of a brand new location, as hinted in the season finale trailer, are all up in the air as the show continues on. This season took us from Neverland to New York, then back to Storybooke and then Oz. It's been possibly the strongest season yet, narrowly avoiding a few of the trappings that plagued the show in its second season. Executive producers Edward Kitsis and Adam Horowitz are on a roll. But as season three ends, we look ahead to season four and what new characters from pop culture might be coming in. Initially, the show had a strong focus on Disney-esque fairy tale characters, such as Snow White and Prince Charming. Fitting, since its home is the Disney-owned ABC network, and tied in rather heavily to the mythology associated with House of Mouse. But as seasons have progressed, they've begun to include characters not owned by Disney, including Frankenstein's monster, and start bringing in all kind of folklore to the series. With that in mind, it seems clear that season four will continue this trend and introduce Emma Swan to even more eclectic characters, including introducing them to the world of Frozen as evidenced by the season three finale. And here are 10 that we absolutely need brought into the fold, along with who could play them.