Granny is a good-natured widow who is extremely protective of her beloved bird, Tweety. Granny's overprotectiveness becomes apparent whenever Tweety is threatened, usually by her sometimes pet, Sylvester. Although having the appearance of a kind old woman, Granny has demonstrated her cleverness in many cartoons.
At least until the mid-1950s, Granny is depicted as an elderly spinster who wears spectacles, a gray bun, and a late 19th-century-like schoolmarm dress; other old-fashioned characteristics include her mode of transportation (usually a Ford Model T or a horse and buggy) and her inability to relate to present fads (such as her telling Tweety she is about to try on a new "bikini bathing suit", which turns out to be a full one-piece outfit from the turn of the 20th century). After 1955 — in particular, the years after Foray began voicing the character — the character's wardrobe was updated and her old-fashioned tastes and ways of life were de-emphasized, and she was sometimes given newer careers, such as a nurse or a bus driver.(via Wikipedia)