M cares for the Kao Nashi in the Natsuwan Void, assuring their stability during their difficult transition into selflessness. Quiet, contemplative, and curious, he seems to show up in the most unusual places. Nevertheless, even the few people who call him a friend have any idea of who he is, where he came from, and how he took charge of modern society's most significant undertakings.
Despite his mysterious nature, he's friendly and kind. Yet the strangest question isn't about who he is or why he exists but why everyone seems to lack the curiosity to find out.