Hermione Granger’s Patronus in J.K. Rowling’s Harry Potter series is an otter.
A Patronus is a protective magical guardian produced by the Patronus Charm. Hermione’s Patronus takes the form of an otter, which appears in Harry Potter and the Order of the Phoenix when members of Dumbledore’s Army practice the charm. The otter is also Rowling’s favorite animal, according to comments associated with the character’s design.
Hermione’s Patronus is distinct from those of her closest friends. Harry’s Patronus is a stag, while Ron’s is a Jack Russell terrier. The form of a Patronus can reflect personality or relationships, but the books do not present a single mechanical rule that determines every form.
Readers sometimes confuse Hermione’s otter with the doe Patronus associated with Severus Snape or the stag associated with Harry and James Potter. Patronuses can also change in rare circumstances, as the series shows with some characters. Hermione’s remains an otter in the established story.