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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.
Chapter 2: On the Trail of the MarkEdit
Charlie appears when Phantom R leaves police head quarters. She challenges Phantom R to a football (soccer) match in the street, which Phantom R wins, escaping with Fondue. Charlie wishes to apprehend Phantom R so he can be noticed by her father, Inspector Vergier.
Chapter 4: The Paris OpéraEdit
After getting the pendant from Duchess Elisabeth, Charlie appears on a glider to get her revenge. She challenges Phantom R to another football match, losing when she tries to grab the football and falls from the building. Phantom R helps her up and escapes again.
Chapter 7: Saving MarieEdit
When Marie is captured, Phantom R figures that he needs Charlie's help. Everyone he asks says that Charlie's school had let out around that time, and that she was strangely wearing pink. Phantom R eventually finds Charlie at the Café and realizes that Charlie is in fact a girl.
Phantom R tries to save Marie at the Eiffel Tower but is shot by Jean-François, when another Phantom R appears on a glider. This other Phantom R is really Charlie. She saves Phantom R from being shot, gliding him to safety, and is relieved when he wakes up. She runs off to head quarters to alert the police of Napoleon's attack.
Chapter 9: Weapon in the CloudsEdit
Eventually, using the Eiffel Tower as Phantom R did, the police force board the Hanging Gardens. Charlie and Inspector Vergier help Phantom R fend off the real Chevaliers Diabolique.
After using the Bracelet of Tiamat to destroy the gardens' power source, they begin collapsing. In their escape, Phantom R, Marie and Fondue attempt a dangerous jump across a gap in the pathway. They don't make it, but are all saved by Charlie, who claims that it makes her even with him after he saved her.