Last Days of an Immortal by Gwen De Bonneval and Fabien Vehlmann is one of the most thought-provoking, interesting comics I have read in some time. Set in a future where humankind has evolved beyond violence (mostly) and is in contact with alien races, global law enforcement is composed of philosophers rather than truncheon-wielders. Thanks to advancements in medical science, humans can essentially live forever by transferring their consciousness into multiple identical bodies, with the only negative side effect being a loss of early memories if the minds are re-integrated.
One of the top Philosophical Police agents, Elijah, is called upon to mediate tensions between a couple of alien races; failure to do so could result in great destruction on Earth and off. At the same time, Elijah is disturbed and a little hurt that one of his oldest friends has decided to voluntarily end his own life without telling Elijah. As he investigates the root of the tension between the alien races, he comes to understand both the case and his relationships with greater clarity.
Last Days of an Immortal is an ingenious piece of writing wrapped in an imaginative art style that creates a vision of the future that is both contemporary and quaintly old-fashioned, as if a graphic novel had arrived from the era of Aldous Huxley. Long may it survive.