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 thinking about Loid Forger

Fiona Frost (フィオナ・フロスト) 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 average height 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.

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 Loid Forger to hide her true emotions, Fiona tends to remain emotionless on the surface—even when making a mental confession of love to Loid she kept her stone-cold face plastered on. She thinks of herself as the superior partner to Loid and wishes to separate him from Yor Forger so they can be together.

History
Fiona was trained under Twilight to become a spy. After he told her that a spy must never show their true feelings, Fiona decided to "remain stone-faced for the rest of her life," and became a spy that didn't let their emotions get in the way of the mission. However, the more she worked alongside Twilight, the more she developed feelings for him. When Twilight was assigned Operation Strix, Fiona wished to work with him as his wife but was unavailable at the time due to another operation. Instead, she was placed in Berlint General Hospital to work undercover as an assistant to Twilight so she could provide him with information on missions.

Campbelldon Tennis Arc
At WISE Safe House G, Sylvia Sherwood briefs Fiona on Twilight's mission next week. Sylvia is assigning Fiona to the mission as per Fiona's proposal to make it a joint operation. Sylvia tells Fiona to inform Loid of this development and to work out the plan together and warns Fiona to ensure it does not get in the way of Operation Strix. Hearing this, Fiona asks about the progress of the mission and Sylvia tells her it is going slowly. Fiona apologizes that she could have done more for the operation in the wife role had she been available earlier and wonders if she could stand in as the wife if it isn't too late. Sylvia rejects her, saying that changing wives now would draw scrutiny from Eden Academy and that the Forgers are in good standing with their neighbors, so they're keeping the family as-is. Fiona then mutters that there would be no choice if the wife were to abandon the role before leaving. Sylvia warns Fiona not to be plotting something.

At the Forgers' apartment, Fiona rings the doorbell. Yor opens the door, greeting Fiona, who introduces herself as Loid's co-worker. Yor apologizes and explains that Loid and Anya Forger took Bond Forger for a walk. Fiona's thoughts reveal she is aware of Loid's absence and was waiting for Yor to be alone. Fiona then claims she came to return a magnifying glass Anya left at the hospital; Yor thanks Fiona and invites her in. Fiona and Yor sit on the couch, Fiona sipping a hot drink. When Yor stares at Fiona, she assumes Yor thinks she is Loid's lover, then proceeds to compliment their home. Fiona is determined to remove Yor from Operation Strix and usurp her role as the wife. She tries to look for an opening, but is unable with the skill Yor carries herself. Fiona decides to make Yor leave of her own will as it would be risky to remove her directly.

Fiona brings up Anya, asking if Yor doesn't tire of having to raise a child in an attempt to pressure her into giving up her role of wife. However, Yor doesn't think so and says she and Anya have a lot of fun together. Yor wishes she was good at more things to make it easier for Loid. Fiona agrees and begins to claim that Loid frequently complains about Yor at work but is interrupted by the return of Loid, Anya and Bond.

Loid is surprised to see Fiona and asks what she is doing there. Fiona greets Loid as Yor explains that Fiona came by to return the magnifying glass. As Loid and Fiona hold a conversation, they mouth different words to communicate secretly, and Fiona states that she's here to assess the state of Operation Strix. Fiona asks Loid if walking Bond is an essential part of this operation and why it wasn't Yor doing the errands instead. Seeing his talents wasted on playing house, she suggests they review his operational tactics, but Loid tells her it isn't her place. In her mind, Fiona proclaims her love for Loid, shocking Anya. Fiona believes she would provide far superior domestic and operational support, imagining Loid praising her abilities and deciding to marry her instead as Yor runs away crying. As Loid and Fiona stare at each other, Fiona imagines her wedding with Loid and thinks about where they'll have their honeymoon.

As it rains, the agents sit down to continue their conversation. Yor serves cocoa to Anya and coffee to Loid, giving him a jar of milk. Fiona thinks Yor must be incompetent as Loid takes his coffee black, but Loid pours the milk into his coffee, to her surprise. Fiona bites at her thumbnail at the thought of Loid showing a side she doesn't know to Yor, then assumes it is part of his character as Loid Forger. Anya suddenly spills her cocoa on the table, surprising her parents. Fiona thinks about how she could have trained Anya, in place of Twilight, to catch the cup before it hit the table. Fiona imagines training Anya by a strict minute-by-minute schedule to maximize her knowledge and strength and transform her into a Stella Star procurement machine. Anya starts clinging to Yor and showers her with praises for being a loving parent. Fiona tries to appeal to Anya by offering imported cocoa, but Anya hisses at her angrily.

Fiona watches as the Forgers bond together and sees Loid smiling to them. Fiona has a flashback of when Loid was training her as a spy and taught her to never show her true feelings. Having observed his many disguises, she detects that this smile is at least genuine and clenches her fists. Fiona says she forgot to buy potatoes and quickly leaves. Loid runs after Fiona to return her umbrella and walk her to the station. Fiona tells Loid she's been assigned to partner with Loid on the next mission. As she turns towards Loid with a sad expression, she is grateful for the rain for hiding her emotions. Fiona informs Loid she will contact him with details at the hospital. She resolves to show how capable she is in the hopes that Loid will realize she is the only one fit to be his wife and walks away in the rain.

Fiona Frost reflects on how Loid Forger being with his family has led him to develop inappropriate emotions and become a worse spy. Seeing Twilight become like a knife with a chipped blade makes her heartache. Still, she finds this new version of him adorable and endearing and still yearns for him. Because of this, she's determined to usurp the wife position from Yor Forger.

At the hospital, Fiona details their new mission to Loid. For the mission, they must acquire the painting "Lady In The Sun," worth roughly one million dalc. The painting once belonged to the late Colonel Erik Zacharis, who supposedly possessed secrets which could reignite the flames of war in a collection of documents known as the Zacharis Dossier. They are rumored to contain information about inhumane actions from both the East and the West. It is believed that the painting is key to finding the Dossier. Not wanting to risk the Eastern government finding it before they do, they must retrieve it from Cavi Campbell, a world-renowned art collector. As the painting is beneath Campbell's mansion with tight security, Twilight asks if Nightfall has a plan, and she confirms this.

In an underground tennis court, Twilight and Nightfall show up in disguises with tennis rackets in hand. Twilight asks Nightfall if this is the best option, and she affirms this. Cavi and his underground tennis club run this competition, which is known as "Campbelldon." While the competitors are usually very skilled, the winner gets to take an item of their choice from Cavi's collection. It also rids any risks of having to try and steal the painting. The agents are announced as married couple Twain and Nafalia Foney, the identities that Nightfall registered them as. Their opponents are Walson and Bobble, a famous tennis duo that dominated the Grand Slam Circuit a decade ago. The bets are against them as men announce to the agents that they've worked hard towards perfection and will win this match.

Loid proceeds to win the round by himself without letting up any points. Walson and Bobble are shocked at their loss, but decide in the next game to aim for Fiona since they haven't seen her play yet. Like Loid, she destroys them and wins the game. Afterwards, their next opponents are the Bolic Brothers, who use the new drug "Oso-R" to go from scrawny to large, muscular men. Twilight, after seeing them, questions if this really was risk-free, and Nightfall simply tells him that they will do their best.

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.

Physical Strength: Fiona has massive 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 fell in love with Twilight and now has a certain ambition to become his wife in place of Yor, who 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.

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.

Chapter Appearances

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Anime Appearances

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Trivia

 * 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.

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”.