Anne's bosom friend and kindred spirit. Anne and Diana become best friends from the moment they meet. She is the only girl of Anne's age who lives close to Green Gables. While Anne does not think Diana is very imaginative, Diana is noted for being pretty, merry and very amiable. She is often puzzled by Anne's extreme imagination, but she does have a little imagination of her own.

She decides against going to Queens Academy with Anne to pursue her own way of life, caring for Anne to the end and supporting her every time Anne comes to visit.