Fiona Frost

"You're weak. You're afraid to die. You're afraid of being betrayed. You're incapable of trusting anyone. You have no one to believe in. No one to gaze at and intently scrutinize. You've given up on the world. Now you're just an empty man meddling in it for no reason greater than your own amusement. But I'm not afraid. I believe in that man. I think of him and think of him and think of him and think of him and think of him and think of him. '''It's what makes me strong!! It's why you have no hope of beating me!"

- Fiona Frost in Chapter 85

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 fairly tall woman with pale complexion. She has 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. Fiona's age is currently uncertain, but it seems she's younger than Loid.

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. While this is true to an extent, her desire to build her reputation stems not from a lack of scruples or ambition per-se, but from a desire to impress Loid.

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
Enhanced 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 in a tennis match. After losing to Yor in said match, Fiona took to the mountains to train for her revenge match, which has improved her strength and endurance.

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. However, in this state, the strength of her blows is so great that it has serious effects on her body. Every limb she used to strike Winston with broke, and even a missed punch dislocated her arm.

Enhanced Speed and Agility: Fiona has demonstrated to be quite nimble. She's capable of performing several acrobatics to avoid rubber bullets fired from multiple angles in the middle of an underground tennis match.

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.

Heightened 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.

Twilight: Although this is not a skill as such, Fiona's unwavering dedication to keep fighting, her pursuit of strength, and her overall demeanor are profoundly influenced by her connection to Twilight. He serves as her primary motivation and driving force for almost everything she does. The deep attachment she feels towards him leads her to go to extraordinary lengths, even engaging in confrontations or causing harm to others if they obstruct Twilight and his ideals.

Fiona's abilities are significantly amplified when she believes she can satisfy Twilight, as demonstrated during the Campbelldon tournament, where both of them collaborated seamlessly, utilizing Loid's motivation as a driving force to achieve victory in a surprising manner, working in perfect coordination to defeat their rivals. Her devotion to him extends to an extreme level, as she would willingly make the ultimate sacrifice for his well-being. A clear example of this is seen when Winston incapacitated Twilight, and Fiona, fueled by her fierce protectiveness, delivers inhuman blows to Winston, disregarding her own safety, resulting in breaking all of her bones. Loid's presence and happiness form the foundation of Fiona's actions, pushing her to extraordinary measures to ensure his safety and fulfill his desires.

Chapter Appearances

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Anime Appearances

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Trivia

 * Fiona's first appearance in the original release of Chapter 29 featured her with a slightly different design, with raised bangs and her right eye being visible. This was changed in the release of Volume 5, in which her current and final design was used.
 * 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.
 * Fiona used to smile before Loid told her to "Bury your emotions deep."
 * 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.
 * Tatsuya Endo gave Fiona the code name, Nightfall, to symbolize how nightfall follows twilight.
 * Nightfall's chair, featured on the cover of the sixth volume, is a Panton Heart Cone.
 * In terms of combat ability compared to Yor, Fiona is very low, even lower than Loid. She appears to be on par with Yuri Briar.
 * 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."
 * (To herself): "What a wonderful man you are, Twilight. I'll achieve peace between East and West. And I’ll do it all for you."
 * (To herself): "The moment he referred to her as just "Yor" was the moment I knew I was only gonna get his official explanation. Nevertheless, his analysis was correct. By framing it was necessary for the mission, he's made it impossible for me to object. That was a dirty move, Twilight."