Hitman by Garth Ennis and John McCrea Omnibus Vol. 1

Ex-military operative Tommy Monaghan, equipped with x-ray vision and telepathy, navigates the treacherous underbelly of Gotham City as a hired gun. Balancing his moral dilemmas and personal honor, he encounters iconic villains like the Joker and Batman while facing a contract on his life from a vengeful mob boss. With his friends in danger, Tommy must confront a formidable assassin and a powerful mob army, testing the limits of his extraordinary abilities in a fight for survival and retribution.