The strict leader of the human enclave and Julie's father. He initially dismisses R's warnings about the zombies' revival and threatens to execute him until Nora intervenes. During the Boney attack, he wounds R but is convinced of R's humanity after seeing him bleed. He ultimately orders the destruction of the protective wall, signaling the end of the apocalypse.
Julie is the Colonel's daughter, but their family bond is strained by his strict leadership and disbelief.
The plot explicitly identifies Colonel Grigio as Julie's father. Julie also confronts him when he dismisses the warning about the zombies' revival.
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