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Code name of Fiona Frost, a character from the manga 'SPY x FAMILY'.

Perhaps because there is a lot of communication between spies in the story, she is often referred to by this name rather than Fiona in the main story.

In the first place, 'Fiona Frost' seems to be a pseudonym used for infiltration, so it may be said that this one gets closer to her true nature.

For more information, see the article Fiona Frost.