Emma serves as a pilot in the Kotobuki Squadron, operating within a two-person cell where she alternates between vanguard and wingman positions. She flies a blue Hayabusa fighter marked by her personal emblem—a blue scythe hovering above a white rose—with rose thorn patterns adorning the rear fuselage and wingtips. Her blond hair is typically secured in a French bun by a white rose pin on her right temple, though she occasionally wears it loose to waist length. She dresses in a blue and gold ensemble with a blouse and brown gloves extending to her biceps. In combat, her pupils narrow to slits during target fixation.

Outwardly refined and aristocratic, Emma speaks with noble grace and favors tea rituals. This contrasts her cynical core, prone to snide remarks and passive-aggressive insults. Shaped by financial hardship, she lives as an extreme miser—prioritizing thriftiness, recoiling from waste, and maintaining spartan habits despite her elegant facade. Hidden anger fuels her volatile combat style, yet she never directs these flaws toward squadron allies. She exhibits patience and kindness toward friends, especially Kirie, offering steadfast support during distress.

Emma hails from a once-wealthy Rahama noble family ruined by her parents' financial mismanagement and vulnerability to scams. She attended private school as a child and retains friendships from that era. To support her family, she became a mercenary with the Kotobuki Squadron, hiding this occupation; her parents believe she travels luxuriously. She sends most earnings home, inadvertently funding their continued wastefulness and attracting scammers. Emma intercepts such fraudsters but avoids confronting her parents. Her primary goal is restoring their former estate—having already repurchased their house and a rare Rahama sakura tree, which she tends meticulously.

Throughout the Rahama Campaign, Emma joins every squadron mission. She mocks adversaries like Adolfo of the Nazarin Squadron and contributes tactical insights during battles. When Elite Industry pirates invade Rahama, her personal history drives fierce resistance. She publicly berates the mayor for capitulating, rallying townsfolk to defend the city. Shot down by pirate leader Torihei in the ensuing skirmish, she survives an emergency landing after mayoral intervention and later apologizes for her insults. When her aircraft requires repairs, she scouts for reinforcements during an infiltration aboard Kirie’s plane and pilots Zara’s Hayabusa to thwart internal betrayals. Her aggressive target pursuit and sharp observation earn her the moniker "Emma the Fierce."