Disclaimer: I don't own Miraculous Ladybug or other crossovers.

Author's Note: This is my first-time making crossover story of Miraculous: Tales of Ladybug & Cat Noir, and this is one-shot crossover chapters.

Plot: Tom and Sabine were worried to their daughter's well-being and bullied by her former classmates from the lying manipulative Lila Rossi. They had no other choice, but to call help from a Friend of the Family.

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Visitors: Joker and Harley Quinn

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Joker's Hideout, Gotham City

"Wahahaha! Yahoooo! What a haul, what a haul! Hahahaha!" Joker, Crime Prince of Gotham, founder and leader of the Joker Clan, and arch-nemesis of Batman, is tossing money, gold coins, and jewels in the air then showering down as he spread his arms of his loot.

"Oh, Mister J, we really HIT BIG TIME! Whoooooo!" Harley Quinn, Joker's henchwoman and sweetheart, second-in-command and co-founder of the Joker Clan, falls down on the pile of loot as she doing snow angel on the cash.

Bud and Lou the Hyenas were laughing with joy to their masters happiness while members of the Joker Clan celebrating their success.

"True, Harley, my dear." Then he hears ringing on his pocket and pick up his smartphone with a familiar name 'Sabine' on it as he answers with a smile. "Bonjour, Sabine, it's been a while. . ." He receives a garble response. ". . . how's my little gumdrop Marinette. . ." With a familiar name, Harley rose up with a squeal and the two hyenas approach their masters' honorary niece, another garble response which made the Joker smile drop as he making frown. ". . . what . . . she's been bullied. . . by who. . . her own classmates. . . the teachers doing nothing. . . even the principal!" He grasps his phone with anger. "Who's responsible for spreading these preposterous rumors?!" Shouted with fury which scares Harley and the members of the Jokers, except for Bud and Lou. "Merci, Sabine, I'll be on my way." He turns off his phone, as he sighs and he smash his fist on the wooden table then he turns around, facing the Joker Clan with angry expression.

"Everyone, I'm giving you one week vacation on Hawai'i."

"Uhm, thanks, boss."

"Don't mention it. Harley, pack your bags, we're leaving Gotham tonight."

"Where are we going, pudding?" She asks him.

"Paris, Harley dear, we're gonna make a smile on that lying Italian harlot." Joker smiles menacingly while the hyenas laughing to the unfortunate victim.

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Collège Françoise Dupont, Paris

Inside the classroom of Miss Caline Bustier, where Lila Rossi, also know Lie-la, so-called daughter of Italian Ambassador and current Class Representative, making lies about 'how she met her Damiboo aka Damian Wayne', 'how she personally encounters Gotham's Dark Knight Batman', and other lies she's making as everyone: Ivan Bruel, Mylène Haprèle, Max Kanté, Lê Chiến Kim, and Sabrina Raincomprix listens to her. Adrien Agreste, also known Mister High Road, just keeps silence.

While the other group, Alix Kubdel, Chloé Bourgeois, Juleka Couffaine, Nathaniel Kurtzberg, Marinette Dupain-Cheng, Rose Lavillant were not listening of her, since they didn't believe her words coming her mouth. Marinette Dupain-Cheng, daughter of Tom & Sabine, current holder of Ladybug Miraculous, and current Guardian of the Miraculous, is annoyed of Lie-la's nonsense as she covers her ears with her hands. She really wanted end it.

Until. . .

"You can't go in there!"

"Shut it, chubby man!"

"Why can't w-"

"Zip it, woman!"

"As the principal of. . ."

"Sic 'em, boys!"

"Aaaaaaaaaaaaaaaaaaaaaaaaaahhhhhhhhhhhhhhhhhhhhh!"

"Harley dear, would you do the honor."

"Sure thing, Mister J." When everyone hears a cocking sound of a weapon, Marinette shouted to everyone.

"Everyone, get down!" Everyone follows what she said as they duck and cover under their desks. The door was blasted to pieces and wide open as white smoke appears. Marinette rose up from her desk as her eyes widen in shock at the door, one by one everyone rose up and they see Marinette frozen as they follow the direction that she's looking which they also widen their eyes in shocked and horror. Standing on the wide open of the door is Gotham's criminals: Joker and Harley Quinn. Joker scan the room and he saw her which he zooms straight at her and he hug her tightly while twirling happily.

"Hahaha! My little gumdrop, I'm so happy to see you!" He stops twirling as he let Marinette stand as her eyes and stars circling around and she shakes her head, and she facing him.

"Hey, Uncle J?"

"What! UNCLE!" Everyone in the classroom shouted in unison.

"Hey, Marinette, don't forget about me!" She said it as she pouted which made the baker's daughter chuckles.

"Hello there, Aunt Harley."

Two hyenas came inside the classroom which made everyone, some of them awe, some of them frightened. The principal and the teacher went inside the classroom while their clothes ripped by Bud and Lou, as they back away. Marinette squeal as she ran up to them and she hug them lovingly.

"Oh, Bud, Lou, it's good to see you guys again!" Her response was licking on her face with saliva, which everyone even Lie-la disgusts and some awe. Marinette was laughing while wiping her.

"Seriously, guys, what made you visit here on Paris?"

"Gumdrop, your mother called me on the phone about the bullying. So which one of these bozos is Lila the Liar?"

"Hey, Lila is not liar, Mari-trash is the BULLY!" Alya shouted to defend her bestie, Lila, who was tiptoeing to escape, but she was point out by Chloe.

"There she is, that's Lila Rossi, Monsieur Joker!"

"Oh, so you're the ONE spreading false rumors and bullying my little gumdrop?!" Joker angrily shouted at her face which made the liar scared, and he said to her with gratitude. "And thank you for your assistance mademoiselle."

"It's Chloé, Chloé Bourgeois, and it is my pleasure to assist, monsieur." The daughter of the Mayor of Paris response back.

"Now where were we?" He claps his hand as Harley said with mischievous smile while sitting on the unconscious Ivan and Kim.

"You're about to do something nasty~ to her, Mister J!"

"Oh, yes, thank you Harley." He pulls out a butterfly knife, as he turned around and he was about to say on Lila. "Now let's-"

"Uncle J, she's escape!"

"What?!" He looks at the window and saw the liar running. "Why that harlot! Bud, Lou, we're going hunting, boys!" The Joker and the two hyenas run to the door while stepping on Caline and Denis with footprints on them.

Marinette, Harley and her loyal friends having break and eating macaroons as they're hearing Lila's screaming for help and Joker's laughter.

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Bonus:

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Luka Couffaine Stone, boyfriend of Marinette Dupain-Cheng, and current holder of Snake Miraculous, was inspected by Joker as he continues observing Marinette's boyfriend closely up and down, then he closes his eyes and raise his hand then thumbs up with a smile.

"I approve you to be my gumdrop's boyfriend."

"Thank you, monsieur." Luka sigh in relief.

"But if you broke Marinette's heart, I'll do something very terrible and very gruesome!"

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End