It could be that in a crossover with a monster - filled world like 'Monsters, Inc.', Sulley and Mike could be involved. They might be initially scared of Pooh because he's a strange new creature to them, but then realize he's in trouble and try to help him get unstuck. Another possibility is a crossover with a prehistoric world. In that case, dinosaurs could be around, and Pooh would be really out of his element and stuck among these huge, strange creatures.
In a crossover with a fantasy - adventure world like Middle - earth from 'The Lord of the Rings', characters like Frodo or Gandalf could be involved. Gandalf might use his magic to figure out why Pooh is stuck, and Frodo could empathize with Pooh's feeling of being out of place. Also, if it's a crossover with a magical school world like Hogwarts, the students and professors could be involved. Hermione might be eager to solve the mystery of Pooh's stuck state.
If it's a crossover with a superhero world, superheroes like Superman or Spider - Man could be involved. They might try to help Pooh get unstuck. Or if it's a crossover with a Disney princess world, the princesses could be there. Maybe Snow White could offer Pooh some apples (although that might not be the best idea considering his situation).
Well, perhaps in 'pooh gets stuck crossover fanfiction', Pooh gets stuck while trying to follow a new friend from the crossover world. Say it's a crossover with a sci - fi world and he's following an alien through some sort of energy portal, but then the portal malfunctions and he's left stuck in a weird in - between space.
In the fanfiction, Pooh could get stuck in a time - loop type of situation. He keeps repeating the same actions over and over again, like climbing a tree to get honey but always ending up back at the bottom. This would be a really interesting and puzzling situation for Pooh, and he would have to figure out how to break the loop with the help of his friends or by learning something new about himself.
Pooh could get stuck in a net set up by some mischievous characters in the fanfiction. They were trying to catch something else, but Pooh accidentally wandered into it. His friends would then have to come up with a clever plan to free him. They might try to chew through the net or find the ones who set the net and ask them to let Pooh go. In yet another case, Pooh could get stuck in a strong wind current that blows him into a corner and holds him there. He would have to wait for the wind to die down or figure out how to move against it.
Most likely her friends or siblings. They are the ones who usually engage in tickling games. They might find the girl stuck somewhere like behind a big piece of furniture and then start tickling her for fun.
Maybe it's an overzealous Hogwarts professor who suspects Harry of being a dark wizard due to his strange appearance in the past. This professor could constantly try to thwart Harry's attempts to find a way back to his time and also try to drive a wedge between him and Snape.
Maybe Zane and Syrus get trapped in a strange virtual world created by some glitch in the digital system. They have to rely on each other's skills to find a way out. Zane's logical thinking and Syrus's knowledge of the digital realm might be combined to overcome the various obstacles like malfunctioning programs and security barriers.
Perhaps Thor could be involved too. He might accidentally bump into Sigyn after her haircut and be really surprised. His reaction could lead to some humorous or important interactions. For example, he could be so shocked that he says something silly, which then spreads around and becomes a topic of gossip among the other characters.
One possible ally could be a powerful mage from a different anime in the crossover. This mage could help Ichigo understand the strange magic or energy in the new world he is stuck in. Also, Uryu might be an ally. His Quincy abilities could complement Ichigo's powers in Mugetsu form as they face new threats together.
In addition to the main ones, characters like Shampoo and Ukyo might play important roles. Shampoo, who has her own feelings for Ranma, may have a different approach to a female - Ranma. Ukyo too, might have a new dynamic with Ranma in this situation. And of course, there could be other minor characters from the original series that get involved in the fanfiction, depending on the author's creativity.
Well, Naruto is the main one. But also, Kakashi could be involved. He might be a bit amused at first but then help Naruto figure out how to use his new body to his advantage in combat. And then there's Hinata. She could have an interesting reaction, perhaps being more shy around Naruto as a girl, or she could be more empathetic as she also has her own insecurities.