Abigail “Abby” Caruso is a New Radion Bay native by choice, waitress at the Dash & Eggs Diner, and the vigilante sidekick known as Flash Fry. Originally arriving in the city as a runaway teenager, Abby became an adopted member of the McAllister family. By the events of Year Zero, she is Kayla McAllister’s closest friend and confidante.

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Raised in an abusive household, she fled home as a teenager and traveled alone to New Radion Bay in search of independence. At approximately fifteen years old, she arrived with little money and no support system. A chance encounter with John “Buck” McAllister at the Dash & Eggs Diner altered her trajectory. Recognizing the signs immediately, Buck ensured she was fed and helped her secure employment at the diner.

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Abby remained in New Radion Bay, building stability through work and grit. Over time, she developed a sister-like bond with Kayla McAllister and became a regular presence in the McAllister household.

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An avid skater, Abby became quite adept, if not still quite reckless, on wheels.

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By 1957, Abby works as a waitress at the Dash & Eggs, moving through the chrome-tiled diner on roller skates with practiced speed. She is sharp-tongued and unafraid to be herself; when it is clear Kayla will need a sidekick (or so Abby decides) she doesn't hesitate.​

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Drawing inspiration from her diner uniform roots and the city’s chrome-and-neon aesthetic, Abby adopts the moniker Flash Fry. Where Swanblade represents precision and inheritance, Flash Fry embodies motion and immediacy.

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Or, in other words: a reckless bravado that seems to always work out.