Blu-Tack Bill is a character in The Enemy series, appearing in The Enemy and The Fallen. After the death of his parents, he becomes silent and reclusive, speaking to nobody and regularly playing with Blu Tack (Hence the nickname). He is part of the Morrisons crew, and takes part in the journey to Buckingham Palace. Later, he arrives at the Natural History Museum with his new friends, Ella and Monkey Boy, with the rest of the Holloway kids. He is presumably the first person to notice Paul Channing on the roof after his disappearance.