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 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. Her co-workers see her as an unscrupulous and ambitious woman, capable of backstabbing her peers to build a reputation even bigger than Twilight's own.

She thinks of herself as the superior partner to Loid and wishes to separate him from Yor so they can be together.

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's happy, upset, angry, or even proposing her love. Anya is currently the only person who knows her true nature due to her psychic powers.

Physical Strength: 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.

Loid Forger
Twilight served as a mentor during her training as a spy, teaching her to bury her emotions and show no weaknesses. Likely because of the time she spent with him, Fiona's respect for Twilight turned to love and she now has a certain ambition to become his wife in place of Yor, whom she deems unsuitable for such an important role.

Yor Forger
Fiona believes Yor is lacking as Loid's wife and is jealous of the fact that a woman far less skilled than her in being a wife gets to be his wife and that Yor can manage to evoke some genuine positive emotion from Loid when in his company. After Yor utterly defeats her in a tennis match, Fiona declares her superior for now but vows never to give up on her love for Twilight, even going as far as traveling to the mountains to train her swing speed in preparation for her revenge match.

Anya Forger
Fiona believes that Anya is not raised strictly enough, and under her (very painful) guidance, she can be made into a Stella Star procurement machine.

Franky Franklin
Fiona first meets Franky after Loid recommends him to her for help on a mission. When they meet, Fiona is initially unwilling to trust Franky as she wants to resolve her mission as quickly as possible and is wholly unenthused when she has to play his girlfriend in disguise. However, after he attempts to protect her from an attack from a SSS agent and explains his neutral stance as an informant, Fiona begins to see Franky differently and decides to become a regular customer, to the latter's dismay, due to her "ugly" methods.

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.
 * Fiona has very good eyesight, as she is always staring at Twilight from a distance.
 * 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.

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."