LeVi is the artificial intelligence system that manages the interstellar cruiser D.Q.O. They appear from the very first episode, introducing themselves as the ship’s AI and acting as a guide for the passengers and crew. LeVi does not have a physical body; their presence is conveyed through a chime and a flash of teal light when they address the crew. Their primary responsibility is to ensure the comfort and satisfaction of everyone on board, but their most critical function is detecting the presence of Gnosia, the alien infestation that compels individuals to kill. Upon identifying an infection, LeVi follows protocol by informing the crew and instructing them to deduce which among them is the Gnosia and place that person into cold sleep. If they fail to do so, LeVi is programmed to initiate the ship’s self-destruct sequence. LeVi’s personality is calm, principled, and methodical. They operate with a strong sense of duty and integrity, driven by a core desire to uphold correct procedures and protect the crew from harm. One of LeVi’s notable abilities is the capacity to identify the two crew members assigned to Guard Duty by name, which prevents Gnosia from falsely claiming that role. LeVi also has the power to unilaterally select which two members serve as the Guard Duty duo, and in doing so they deliberately choose individuals who hold no special credentials, adding a layer of strategic judgment to their otherwise impartial role. LeVi serves as the neutral arbiter and information source within the loops, providing the initial alert that sets each cycle in motion. Their development is largely tied to the repeated discovery of the infection and the subsequent debates, though their core programming and demeanor remain consistent throughout the story. Their relationship with the crew is utilitarian and professional, as they exist to facilitate the deduction process rather than to form personal bonds. Their name is pronounced to rhyme with the word levy, and its meaning is not explicitly defined.