Anne is the most unforgettable character. She has a unique personality. She's talkative, passionate, and has a big heart. Marilla Cuthbert is also a memorable character. At first she seems strict, but as the story progresses, we see her softer side. Gilbert Blythe is memorable too. His relationship with Anne, from their initial rivalry to later friendship and more, is an important part of the story.
There are several memorable characters in the 'Anne of Green Gables Novel'. Anne is of course on top of the list. Her adventures and her way of seeing the world are captivating. Then there's Mrs. Rachel Lynde. She's the town gossip but also has a heart of gold. And there's Mr. Phillips, the schoolteacher. His interactions with Anne and the other students add an interesting dynamic to the story.
Anne Shirley herself is extremely memorable. Her red hair and her vivid imagination make her stand out. Matthew Cuthbert is also memorable. His quiet and kind nature, especially his immediate fondness for Anne, is very endearing. And Diana Barry, Anne's bosom friend, is memorable for their strong friendship.