Miss Father's Day is a former Frontier Agent of the secret criminal organization Baroque Works, serving as the female half of a sniper duo alongside her partner, Mr. 7. She appears during the climax of the conflict in the Kingdom of Alabasta, specifically in the capital city of Alubarna, where she and Mr. 7 are stationed inside the clock tower to guard a massive bomb that Baroque Works intends to detonate and destroy both the royal and rebel armies. Her role in the story is that of a minor antagonist who presents a brief obstacle to Princess Nefertari Vivi as she races to stop the bomb. Miss Father's Day is characterized by her peculiar, frog-themed sense of fashion and her use of similarly themed weaponry—her gun, known as the Gero Gun, is shaped like a frog, and its bullets are frog-shaped. As a sniper, her primary motivation is to carry out her assigned duty within Baroque Works' larger operation, called Operation Utopia, without displaying any personal ambition or deeper ideological drive. Her key relationship is with her partner Mr. 7, with whom she operates as a coordinated sniper team; their partnership is purely professional within the organization's structure. She shows no notable development throughout the story, as her appearance is limited to a single encounter. In terms of abilities, she is a skilled marksman who relies on her frog-themed firearm to engage targets from a distance. However, she and Mr. 7 are ultimately outmatched by Vivi, who uses her Peacock Slashers to evade their gunfire and defeat them. No further information about her background or personal history is available.