Lucy Barker is a student in Mr Hunslet's class. She is first seen in Free, where she has a panic attack on a residental school trip to an adventure camp after Ben tells everybody about humans are going to die out. Later she faints when Ben jumps out of a pile of leaves. She cannot sleep after Ben's ghost story, and is generally very jumpy and nervous. She uses an asthma inhaler when she is stressed or panicked.
She is metioned in Ben's Parents Evening several times. Ben said something happened between him and Lucy and it was a misunderstanding. Also she in said to been off school for 2 days after Ben's history project on "Symptoms of the Black Death". In her appearance she is wearing a yellow t-shirt and jeans, with blonde hair.