One interesting storyline could be that Sweeney Todd ends up in Willy Wonka's chocolate factory. Maybe he's searching for a new place to carry out his dark deeds, but is instead distracted by the magical confections. He could start to have a change of heart as he experiences the wonder of the factory.
A third storyline could be a crossover of their worlds. The people from Sweeney Todd's London end up in the world of Willy Wonka. The contrast between the dark, dreary London and the colorful, sweet factory would make for a great story. The Oompa - Loompas could interact with the characters from Sweeney Todd, leading to all sorts of comical and dramatic situations.
Sweeney Todd would probably be very suspicious of Willy Wonka at first. He's used to a world of betrayal and darkness, while Wonka is all about whimsy and fun. But Wonka, with his kind heart, might try to show Todd the beauty of his factory.
One idea could be exploring the backstory of the Oompa - Loompas. Maybe they had a life before coming to the chocolate factory that was full of adventure. Another could be a story where Charlie Bucket has to save the factory from a new, mysterious threat that even Willy Wonka can't handle on his own. And also, a fanfiction about a new character who enters the factory during one of the tours and has a special power that affects all the magical candies.
One interesting plot could be Willy Wonka taking Charlie on a special adventure outside of the chocolate factory. They could discover a new magical land filled with never - before - seen candies and strange creatures. Another plot might involve Charlie using his kind heart to help Willy Wonka overcome some personal demons or past traumas. Maybe Charlie's positive influence makes Wonka more open and less reclusive.
He could be portrayed as a mysterious and eccentric figure, just like in the original stories. His wild ideas and love for creating strange and wonderful candies can be a big part of his character. For example, he might suddenly start dancing around the factory while showing the male reader his latest creation.
One interesting Sweeney Todd fanfiction could be one that explores Todd's life before he became the vengeful barber. It might delve into his early relationships, his hopes and dreams that were shattered, leading to his dark transformation. Another could be a fanfic that gives Mrs. Lovett a different backstory, perhaps a more sympathetic one that explains her actions in a new light.
One interesting concept could be a new character who has a special connection to lemons in the Willy Wonka world. Maybe they can communicate with the lemon - themed candies or use lemons in a unique way to solve problems in the factory.
One interesting idea could be a reimagining of Willy Wonka's past that's darker, like he had a difficult childhood that led to his eccentricity. Maybe he faced some sort of betrayal in his early days of chocolate - making that made him more secretive and controlling over his factory.
One idea could be creating an OC who is a long - lost relative of Willy Wonka. They could arrive at the factory with a unique skill, like being able to communicate with the candies. Another idea is an OC who is a competitor in the candy - making world, but ends up learning from Willy Wonka and becoming his friend. Maybe an OC who is a magical creature that has been living secretly in the factory all along.
One interesting plotline could be the main character learning the secrets of Wonka's magical candies. For example, they might discover how to make a candy that can make you fly. Another could be the character getting involved in the creation of a new area in the chocolate factory, like a room full of living gummy bears.
One idea could be that the male reader is a chocolate connoisseur who gets invited to Willy Wonka's factory for a special tasting event. Along the way, they bond over their shared love for unique chocolate flavors.