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Significant plot details follow.
Charlie Vergier (クロード, Kurōdo), later Charlotte, is an antagonist and protagonist in Rhythm Thief and the Emperor's Treasure. She is a girl around Phantom R's age who claims to be a detective.
Phantom R initially mistakes Charlie as a boy because of her tomboyish nature. She constantly tries to arrest Phantom R with her football skills, and proves to be a worthy adversary to Phantom R when she predicts his movements twice.