Fiona Frost

"What a wonderful man you are, Twilight. I'll achieve peace between East and West. And I’ll do it all for you."

- Fiona Frost in Chapter 60

Fiona Frost (フィオナ・フロスト) is a major recurring character of the SPY x FAMILY series. She is a spy for WISE who acts under the codename "Nightfall" (〈〉). She works undercover as an assistant to Loid Forger at Berlint General Hospital to provide him with mission details.

Appearance
Fiona is a pale woman of above average height for her age with bobbed hair of a light lavender color and a long fringe covering much of the right side of her face, worn swept behind her left ear. She has cold purple eyes framed by light-colored eyelashes, and most often is seen wearing an emotionless expression. She is described as beautiful by Yor Forger.

Fiona is introduced wearing a duffel coat with a black turtleneck and pants underneath, and her outfit when visiting the Forgers' house consists of a black blazer and a low-dip light shirt. Her stud earrings take the shape of WISE's symbol.

Personality
After being trained by Twilight to hide her true emotions, Fiona tends to remain emotionless on the surface—even when making a mental confession of love to Loid. Fiona is deeply in love with Loid, to the point of being capable of compromising Operation Strix by visiting the Forger's residence and even telling Sylvia Sherwood and Loid himself to replace Yor and let her take over the role of the Forger wife. Fiona thinks of herself as the superior partner to Loid and wishes to separate him from Yor so they can be together. To others, like her co-workers, Fiona is seen as an unscrupulous and ambitious woman, capable of backstabbing her peers to build a reputation even bigger than Twilight's own.

Fiona can act hastily in getting missions done, especially if Loid is involved. For example, when infiltrating the Campbelldon tennis tournament with Loid, Fiona pushed herself to complete their mission and impress him as much as she could. Fiona is also very distrustful of others and is willing to use them as pawns to fulfill her goals, like when she gained the help of a counterfeiter by calling SSS agents on him and subsequently protecting him from them. Despite her methods, Fiona is a proficient spy and capable of partnering with others, like Franky, who she has grown to trust to some extent.

Abilities and Skills
Poker Face: Fiona is able to conceal all of her emotions, making it impossible for anyone to tell what emotion she is feeling. At all times, she has a stone-cold look on her face, whether she is happy, upset, angry, or even proposing her love. Anya is currently the only person who knows her true nature due to her psychic powers.

Strength: While not as powerful compared to the stronger characters in the series, Fiona has impressive physical strength, shown when she took multiple opponents in tennis and, to some degree, even managed to rally a shot by Yor.

When Fiona reaches a state of complete rage, her physical prowess becomes extraordinary, allowing her to deliver inhumanly powerful blows. During her confrontation with Winston, her intense anger enabled her to incapacitate him effortlessly, disabling both his arms and sending him flying. It is possible that Fiona's training in the mountains played a significant role in enhancing her strength to such extraordinary levels. This training likely contributed to her exceptional combat abilities, granting her tremendous power when her emotions are unleashed.

Senses: Fiona has good eyesight and can spot things from far away, whether it be watching someone from across a hall, noticing SSS agents stalking from behind, or detecting the little movements of a person through binoculars.

Chapter Appearances

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Anime Appearances

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Trivia

 * Fiona was designed to be the direct opposite of Yor. Her design has short light hair in contrast with Yor's long dark hair. Her color scheme is also dark blue/purple and lavender in contrast with Yor's red and black. Their personalities are also opposites (cold and unwelcoming vs. warm and motherly).
 * Fiona is never seen smiling outside of her (or Yor's) imagination.
 * The name Nafalia Foney she made up the tennis tournament is derived from her agent codename "Nightfall" (same for Twilight's alias Twain). In Japanese, she used the name "Tobarī" (トバリー) which is also a derivation of her Japanese codename, "Tobari".
 * The fake last name, Foney, is a humorous nod toward the "phony couple" they were acting as.
 * Nightfall's chair, featured on the cover of the sixth volume, is a Panton Heart Cone.
 * In terms of combat power compared to Yor, Fiona is very low, even lower than Loid.
 * As a result of her training in the mountains, Fiona's swing speed has increased. If she tries hard enough, Fiona can cut the ball in half.
 * Fiona's English dub voice actor is Lindsay Seidel. However, due to health complications, she was unable to record for Episode 21 and was temporarily replaced by Bryn Apprill.

Quotes

 * (To herself, after seeing Twilight's serious mode): "There it is. That's the Twilight who won my heart. The Twilight I can't stop chasing. The Twilight I want at my side. The Twilight who turned my respect into love. The Twilight whose dreams became my dreams. What I'm saying is… I love you."