Well, you could write a fanfiction centered around a school event gone wrong in Twisted Wonderland. Maybe a magical mishap during a festival that the characters have to fix together. Or focus on the relationships between different dormitories. How would the students from Heartslabyul and Savanaclaw interact in a situation outside of their normal rivalries? Also, a time - travel fanfic where a character goes back in time to change an important event in the Twisted Wonderland history could be really interesting.
A great idea for Twisted Wonderland fanfiction is to give a voice to the minor characters. They often have so much potential that isn't fully utilized in the game. For instance, you could write about the daily life of one of the ghosts in Ramshackle Dorm. You can also create a fanfic where the characters from Twisted Wonderland visit another magical world and how they adapt to it. This could lead to all kinds of new interactions and character development. And don't forget about a mystery - solving fanfic, like trying to figure out the origin of a strange magical artifact in the school.
One idea could be a crossover where the Pokemon trainers end up in the Twisted Wonderland universe and have to adapt to its strange rules. They could form teams with the Twisted Wonderland characters and participate in battles using both Pokemon abilities and the unique magic of that world.
A common plot idea is the crossover of the magic systems. For example, how the magic from Twisted Wonderland would interact with the Keyblade magic in Kingdom Hearts. Maybe the characters from Twisted Wonderland could learn to use Keyblades or the Kingdom Hearts characters could adapt to the unique spells in Twisted Wonderland.
One idea could be a character from Twisted Wonderland accidentally ending up in the Ever After High world and having to navigate their new surroundings. For example, Malleus Draconia finding himself in the middle of a Legacy Day event at Ever After High. He might be mistaken for a new student or an otherworldly being, and his magic could cause all sorts of chaos and misunderstandings among the fairytale - themed students.
One idea could be that the characters from Twisted Wonderland end up in the Black Butler universe. They might be mistaken for new servants in the Phantomhive household. For example, the unique magic abilities of the Twisted Wonderland characters could be used to solve some of the mysteries or problems that Ciel and Sebastian often face in the Black Butler world.
In a Naruto Alice in Wonderland fanfiction, Naruto could be transformed into a character like the Cheshire Cat. His orange jumpsuit could turn into a purple and pink striped fur, and his whisker marks could become more cat - like. He would then use his new form to help Alice (or perhaps a character similar to her from the Naruto world) find her way through Wonderland, all while cracking jokes and using his Naruto - like wisdom.
One idea could be a crossover with 'Attack on Titan'. The Deadman Wonderland characters could find themselves in the world of Titans and have to use their unique abilities to survive. For example, Ganta's ability to shoot his blood bullets might be useful against the Titans. Another idea is a crossover with 'Fullmetal Alchemist'. The alchemical world could interact with the prison - like setting of Deadman Wonderland, and perhaps there could be a search for a way to break the curse in Deadman Wonderland using alchemy.
A cool 'alice in wonderland crossover fanfiction' idea is a crossover with 'Alice in Wonderland' and 'Percy Jackson'. Alice could end up at Camp Half - Blood. The demigods would be very confused by her, and she would be equally confused by all the Greek mythology stuff. Also, a crossover with 'Sherlock Holmes' could be interesting. Sherlock could be called to Wonderland to solve the mystery of the disappearing Cheshire Cat. He would use his deductive skills in this very strange and magical place.
One idea could be exploring the backstories of the minor characters in Deadman Wonderland. For example, you could write about how a particular inmate ended up in the prison. Another could be a what - if scenario, like what if Ganta had different powers. Maybe he could control water instead of his blood bullets.
One idea could be that Alice returns to Wonderland as an adult and finds it has changed completely. The once friendly characters are now in a state of chaos due to a new dark force. Another could be a story where Wonderland is connected to our world in a more secretive way, and Alice has to keep the balance between the two. Or perhaps a fanfiction where Alice teams up with the Cheshire Cat to solve a mystery that involves all the Wonderland characters and their forgotten pasts.
One idea could be Harry finding himself in Wonderland during a strange magical accident at Hogwarts. He could encounter the Cheshire Cat as a magical creature that can disappear and reappear, leading him on a quest to find a way back home while also uncovering secrets about the Wonderland's connection to the wizarding world.