Lydia is a character who first appeared in Going the Extra Milo and was officially introduced in The Substitute. She is a friend of Melissa's who recommends a local mall via video message on her cell phone.
Her biggest role was in School Dance, where she served as the person to have fun for Amanda during the dance.
Lydia has light brown hair and dark brown eyes. She wears her hair tied back with a tan hair band. She wears a tan dress that has orange plaid sleeves and skirt with a brown belt. She has tan sneakers and light tan socks.
Lydia is cheerful, energetic, enthusiastic and loyal. She puts her all into whatever she is doing and can be counted on by her friends to go the distance when called upon.
In The Math Book she is seen with two other members of the drama club rehearsing for a play.
In The Little Engine That Couldn't she attends the Fire Engine Museum after Milo, Melissa and her dad drive an out of control antique fire engine through the natural history museum and collided with the life size Tyrannosaurus rex statue.