Perhaps the Alice boy forms an unlikely alliance with some of the more mischievous characters in Wonderland. They could team up to outwit a powerful and tyrannical new villain that has emerged in the land. He uses his unique perspective as an outsider to come up with creative solutions to the problems they face.
One idea could be that Alice returns to Wonderland as an adult and has to deal with new, more complex riddles and challenges that are related to the grown - up world she now knows. For example, the Queen of Hearts might be having a 'tax collection' problem in her kingdom and Alice has to use her real - world knowledge of economics to solve it.
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 interesting plot twist could be that the Red Queen is actually being controlled by an unseen force. It adds a new layer of mystery to her actions.
Well, perhaps in the fanfiction, the Queen of Hearts is allergic to lemons. And Alice, unknowingly, brings lemons into the Queen's court. This causes chaos as the Queen starts sneezing and her usual angry outbursts are now mixed with her allergy-induced irritation. It could lead to a series of comical and adventurous events as Alice tries to fix the situation.
Alice is a very curious and adventurous character. In the Wonderland story, she has many strange and wonderful experiences.
One idea could be that Alice somehow ends up in Neverland. Maybe she falls through a rabbit hole that magically transports her there. She could meet Peter Pan and the Lost Boys, and they all get confused by her strange Wonderland ways. For example, her size - changing could be a mystery to them.
A really interesting plot would be if the characters from Alice in Wonderland were students at Hogwarts. Alice could be in Gryffindor, always getting into strange adventures around the school that remind her of Wonderland. The Mad Hatter could be a Potions master who makes the most bizarre potions. And the Red Queen could be a strict teacher who is always trying to catch students breaking the rules. There could also be a plot where Voldemort tries to take over Wonderland for some dark purpose, and Harry and his friends have to stop him there.
One idea could be to explore what happens if Alice returns to Wonderland as an adult. Maybe she has forgotten all about it, and then something in the real world triggers her memories and she's pulled back. Another idea is to focus on the backstories of the characters she met in Wonderland. For example, the Mad Hatter's past could be a really interesting plot to develop.
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.
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.