The character requested under the name Puppo is known in Gankutsuou: The Count of Monte Cristo as Peppo. Her background is introduced early in the story, when she is one of a group of bandits operating on the moon city of Luna. During the Carnival celebrations, the bandits kidnap the young aristocrat Albert de Morcerf, and Peppo is directly involved in the abduction. Afterward, she leaves her life as a bandit and takes up employment as a maid in the Morcerf household, a move that places her at the center of the family's unfolding troubles. Little is revealed about her origins; even her name is treated as possibly false, and the story leaves much of her past deliberately unexplained. She was assigned male at birth, but she identifies and presents herself as female throughout the series, and the narrative consistently treats her as a young woman.

In personality, Peppo is mischievous, quick-witted, and highly adaptable. She moves easily between very different environments, from the rough company of bandits to the formal expectations of a noble household, and she has a natural talent for playing a part. She presents herself convincingly as a demure servant despite her more rugged background, which suits her role as someone who observes quietly from the edges of events. Underneath her playful and sometimes theatrical manner, she is sincere in her emotions and capable of genuine loyalty.

Her motivations are driven largely by her feelings for Albert. She falls in love with him, but the affection is unrequited, and she never receives the same devotion in return. Despite this, her loyalty does not waver. The most significant demonstration of this comes when Albert needs help to rescue his former fiancée, Eugénie de Danglars, from being forced into marriage with the fraudulent aristocrat Andrea Cavalcanti. Peppo assists in this effort, acting selflessly even though the outcome brings her no personal happiness.

Her role in the story is that of a supporting figure who connects Albert's world to the Count of Monte Cristo's schemes. At one point, while staying at the Count's mansion, she is instructed by the Count to report on Albert's movements, making her a quiet informant within his larger plan of manipulation. She also volunteers to become a maid in Albert's house, which keeps her close to the Morcerf family during the most critical moments of the plot. In this way, she occupies a unique position, serving both as a companion to the household she grows attached to and as a small piece in the Count's design for revenge.

Her development is subtle but meaningful. She begins as a street-level criminal operating on the margins of society, seemingly focused only on survival and mischief. Over the course of the story, she becomes a more sympathetic and devoted figure, acting out of loyalty even when it costs her personally. Her choice to help Albert and Eugénie, knowing that her feelings will never be returned, marks a clear shift from self-interest toward genuine care for others.

Peppo has no supernatural or combat-oriented abilities. Her strengths are practical and grounded: agility and stealth learned from her bandit past, the skill to disguise herself and convincingly inhabit different social roles, a talent for acting and deception, and keen observational skills. These qualities make her an effective spy and messenger, which is exactly why the Count finds her useful as an informant and why she is able to move freely between the social circles of the story.