His first appearance is in the short story "The Last Illusion" in Barker's Books of Blood Volume 6. He later appears briefly in the novel The Great and Secret Show, then again in a short story called "The Lost Souls" (featured in an anthology called Cutting Edge). He returns as a major character in the novel Everville, and appears alongside Pinhead in Barker's book The Scarlet Gospels.
Harry d'Amour plays a major role in the BOOM! StudiosHellraiser comic series (2011). After Pinhead escapes and places himself in opposition to Leviathan, he and Kirsty are trapped by Leviathan himself and Harry takes Pinhead's place as the leader of Hell's armies. His flayed chest reveals his still beating heart. In spite of his new powers, Harry still carries a gun, enabling him to battle several incursion attempts from other realms.