The Supernaturalist by Eoin Colfer

In a dystopian future where the world is dominated by technology and corporations, a young orphan named Cosmo Hill escapes from a brutal orphanage and joins a group of misfit vigilantes known as the Supernaturalists. This band of rebels, each with their own unique abilities, is dedicated to hunting down and destroying mysterious creatures called Parasites that feed on human life force. As Cosmo becomes embroiled in their dangerous mission, he uncovers shocking truths about the Parasites and the world he thought he knew, leading to a thrilling adventure filled with unexpected alliances and moral dilemmas.