Nina loves being the center of attention, and, like her mother, has a propensity to gossip, which is the cause of some serious quarrels between her and Polly. She wears glasses and is plump as a child. As a teenager, she loses a lot of weight and develops an impressive figure ("Nina looked good and knew it"); she dyes her hair various colors, dresses in the most outrageous fashions, and becomes obsessed with boys. She goes through various crazes while Polly knows her -- superstitions, the Doors, ecology, disco, even Mozart.
She is romantically linked to Leslie Piper.