Gosalyn Waddlemeyer-Mallard is the adopted daughter of Drake Mallard and the deuteragonist of the 1991-1992 Disney series Darkwing Duck. Most of the show is based on Drake and Gosalyn's father-daughter relationship (at least in the episodes in which she appears, as she does not appear in every one; only Drake and Launchpad have that distinction). Gosalyn is a very spunky, athletic, and spirited nine-year-old tomboy who often gets into trouble. She is very bright and often finds loopholes within her own promises, allowing her to get her way.
She was originally voiced by the late Christine Cavanaugh, who also voiced Chuckie Finster from Rugrats, Oblina from Aah! Real Monsters, Dexter from Dexter's Laboratory, and Babe from Babe, and also live-acted as Mona from Salute Your Shorts.
In the first cliffhanger, Gosalyn starts out as spirited, caring, brave, pushy, spunky, and tomboyish. In the second cliffhanger, her personality has become quick-tempered, sassy and sarcastic, and she gets very jealous of her father getting to go on adventures all the time. In the overall TV show, she is reduced to being mischievous, quick-tempered, loud, inconsiderate, and rebellious.
In "Darkly Dawns the Duck: Part 1", Gosalyn was kidnapped for an orphanage by Hammerhead Hannigan but Darkwing saved her, after that he was chased by the police for a misunderstanding and Launchpad begging him to accept him as his sidekick. She arrives safely at Darkwing's hideout.
In "Darkly Dawns the Duck: Part 2", Gosalyn and Darkwing were getting to know each other, she got into Darkwing's breakfast course and she succeeded it with on problem, later Gosalyn sang her grandfather's lullaby along with Darkwing and it turned out that has the code for The Ramrod, later when Darkwing believed that Taurus Bulba gave up, she warned him that it could be a trap but he didn't believed it, Taurus Bulba's henchmen came after Gosalyn, she defended herself but she got captured anyway. After Taurus Bulba received the code, he threw Gosalyn to her death but she was saved by Launchpad, when she assumed that Darkwing was dead, she was back at the orphanage but she was deepressed. Later a duck named Drake Mallard came looking for Gosalyn and she realized that he is Darkwing Duck, and she was relieved to see him alive. In the end Drake adopted Gosalyn and starts living with him and Launchpad as a family.
In "Bearskin Thug", Gosalyn was enjoying the day with Honker until she found out that it's camping season and she hid all the camping stuff as she was explaining to Honker that she hates camping but Drake came and found all the camping stuff by accident and he was so happy that it's camping season again, Gosalyn tried to stop the camping trip but her dad always had a solution for everything, they had their camping before and after the Muddlefoots arrived to join in, later Gosalyn encountered Steelbeak, his Eggmen and Fang. As she was held hostage as Steelbeak explained that he hates nature, which made her feel bad and that he is planning to destroy the forest. Steelbeak put Gosalyn on top of a geyser in order to get rid of her but she got saved by Darkwing and she helped Darkwing defeat Fang, Steelbeak and his Eggmen.
In "Comic Book Capers", she distracted her father and added other antagonists besides Megavolt in her father's comic book script until her father caught her.
In "Cleanliness is Next to Badliness", Gosalyn formed The Darkwing Duck Fan Club and helped Darkwing defeat Ammonia Pine and Steelbeak.
In "Something Fishy", she was furious about the pollution at the beach and she was trying to fix it, she also helped Darkwing during Neptunia's attacks, in the end she makes Darkwing thank Neptunia for saving St. Canard.
In "Hot Spells", she and Darkwing went to Morgana's old magic school with Morgana. After Gosalyn found out that magic is actually science, she tried to find a shortcut to learning magic as she became pawn of Beelzebub's scheme.
"Oh, no! A love potion!"
"Go to my room? See, you never treat me like a hero! You just treat me like your baby girl!" Gosalyn after an argument with her father
"Eek, Squeak, you follow him (Negaduck), I'll defrost Dad!"
"Dad, help me!"
"I am the terror that unwraps at night!"
"Darkwing Duck won't let you get away with this!"
"Oh, big deal, I can swim too, you know!" - Gosalyn hanging on to her dear life before being eaten by a shark
"All right, you asked for it! Suck gas, evil-doers!"
"Whew, it's about time the love potion wore off."
"I'm not afraid of your old gas gun!" - Gosalyn standing up against Darkwarrior Duck
"Honker, help us!" - Gosalyn trapped inside a painting by Splatter Phoenix
"At least he had some some justice left, but still doesn't excuse all this. I say we bust out of here!"
"And I used to gripe when he sent me to my room."
"What's the matter? Chicken?"
"Eight o'clock bedtime? Bummer. Sounds like Dad, though."
"Don't worry Dad, I can handle it!"
"My Dad, the Christmas cop."
"AAH! Hey! Let go of me, let me go! Darkwing Duck is gonna crunch you like a stale corn chip!" - Gosalyn kidnapped by Taurus Bulba
"What? Attack of the Vampires with Fangs and Tentacles is a classic!"
"Uh-oh! I better spray Morgana quick before Dad explains himself into even more trouble!"
"Give it up, Negadope! You've been outclassed by Quiverwing Quack!"
"Heh, heh, heh, heh, oops!"
"All right, hold it. This isn't you, I think that inside you're still Darkwing Duck, and you're still my dad."
"Negaduck! Here I come, ready or not!" - Gosalyn preparing to confront Negaduck