So, i have an idea for a episode, based off one of my previous disscussion: miraculousladybug.wikia.com/d/p/3133492267319580462 (check it out first so that you understand)
Here's how it would go down:
Utada Hikaru comes to Paris during vacation, but is asked to preform at the TVi station. She agrees as word gets around. Everyone is excited to hear her performance, especially everyone at the collegé.
However, before she goes on, one of the board directors decides to shut down her performance to due costs and air time.
Saddened by that, she is goes to the roof to cry. Hawk Moth sends a akuma to her, inhabiting a sillver heart neckalce. He then offers to help her get revenge on the "Heartless" man who denied her a chance to preform. She is then akumatizied into "Queen of Hearts", a villain who transforms others into Heartless-like creatures that grow stronger by the "darkness" in their hearts. Ladybug and Chat Noir attempt to fight the her and her army, but are defeated and forced to retreat.
Later, theycome up with a plan to lure them into a trap at the collegé. The plan works, but soon find themselves overwhelmed. Ladybug then used Lucky Charm, transforming her Yo-Yo into a Miraculous-styled "Keyblade" (Ladybug-styled head, Chat Noir styled guard with a handle, black hilt, and a red and black Yin and Yang key chain), which transforms the "Heartless" back into people upon defeat. After returning the people to normal, Ladybug uses the Keyblade and destroys her necklace.
After purifying the Akuma and repairing they damage, Ladybug and Chat Noir takes Utada back to the TVi studio and convices the director to let her preform. Utada asks them to stay as she'll dedicate her performance to them. They then stay (after a quick recharge) and listen to her song.
So...what do you think? I was going to make this into another story, but it would be better off as a episode. Plus, real world people are not my specialty.