Fan Casting Wide-Eyed Idealist in Sort by Tropes

A character far too idealistic for their own good. It may be the Naïve Newcomer who Jumped at the Call — he or she has a huge stack of comic books/movies/bards' tales, and thinks they're pretty Genre Savvy. Unfortunately, their universe is more toward the cynical end of the Sliding Scale of Idealism Versus Cynicism than the stories they know. Alternatively, they might just be generally nice people whose idealistic attempts at solving the problems of their world turn out to go horribly horribly awry as no one else plays by their rules. Usually used as nothing more than a device to highlight the realism/grittiness/cynicism of the setting.