OK, so this guy makes it in not so much on the basis of being layered and complex as because of the fact that he's totally, totally adorable.
He's tiny (even by mouse standards), he wears an oversized hat and he's searching for his family on the mean streets of old New York.
The best we can do is to mention that he's pretty funny in Joe Dante's Looney Tunes: Back In Action, and that he's on this list because he's Daffy Duck. Criminally underrated, and implicated as the main cause of Aardman's acrimonious split from Dream Works, Flushed Away is actually an enormously fun film, that may not have the soul or finesse of a Wallace & Gromit flick, but which has a joke ratio that's up there with Zucker Abrahams Zucker.
The Nazis, book lovers that they were, banned the book as an allegory for the treatment of the Jews in Europe.
Hazel (John Hurt) may be the nominal hero, but it's Fiver's visions of Watership Down that kickstart the story, and he remains the cutest and most fragile of the rabbits, even blaming himself for all the trouble the rabbits endure. Stroke of genius Imbuing Fiver with an indomitable spirit and an unshakeable belief in his brother, Hazel, that carries him through.
Also, the ability to make our eyes all wet just thinking about him, and the movie. Fun fact His Lapine name is Hrairoo, which means "Little-five" or "Little-thousand" Tricky one, this.
Well, he's voiced by Richard Briers, perhaps the nicest man in the history of Planet Earth.
And that's pretty much all you need to know about a character who somehow manages to retain its innocence through the heartbreaking slog of Watership Down, through the savage dog attacks, environmental destruction and perilous journey, and somehow through Art Garfunkel's blinking Bright Eyes.