Obviously, the main character would be the original character (OC) created for the fanfiction. Then, the Furious Five are great candidates. Tigress with her strong and serious nature could be an interesting part of the harem. Crane, with his gentle and intelligent side, would also fit well. Mantis, Viper, and Monkey each have their own unique personalities that could interact in different ways with the OC. And of course, Po, the Kung Fu Panda himself, could also be included, adding his fun - loving and food - loving nature to the mix.
There might be a snow leopard with the ability to blend into the snow. This character could start as an enemy but later become an ally to Po.
One popular OC might be a female warrior. She has a strong personality and a unique weapon, like a double - ended staff that she wields with great skill. She often teams up with Po and the Furious Five, and fans like her because she represents a different kind of strength in the Kung Fu Panda universe.
One idea could be an OC (original character) who is a new student at the Jade Palace. He or she gradually earns the respect and friendship of the Furious Five, and each of them develops a unique bond with the OC, leading to a harem - like situation. For example, Tigress might be initially skeptical but then sees the OC's determination in training, similar to her own. Crane could be impressed by the OC's quick thinking, and so on.
For the main characters, it could be Po and a human detective. The detective is investigating some strange disappearances in the city that are actually caused by a group of out - of - control kung fu students. Po gets involved because he senses the misuse of kung fu. The detective at first doesn't believe in Po's abilities but as they work together, he realizes that Po's kung fu knowledge and skills are real. They form an unlikely partnership to stop the kung fu students and also to bridge the gap between the panda world and the human world.
A human hunter could be the main antagonist. He has a grudge against all kung fu animals, especially wolves. He believes they are too powerful and dangerous. He hunts them down one by one and when he hears about the wolf OC in the Valley of Peace, he sets his sights on the valley, causing chaos and danger for all the inhabitants, including the wolf OC and his new friends.
The villainous characters like Tai Lung or Shen can also be great focuses. You can write about their backstories, what led them to become the antagonists they are. For example, a fanfiction that shows a different side of Shen, perhaps a more sympathetic side before he turned evil.
Once upon a time in the Valley of Peace, there was a fox with a unique kung fu style. This fox, named Li, was an outcast among the other animals. But Li was determined to prove himself. One day, Po, the dragon warrior, noticed Li's skills during a training session in the Jade Palace. Po was intrigued and decided to train with Li. Together, they developed new moves that combined the fox's agility and Po's strength. In the end, Li became a respected member of the kung fu community in the Valley of Peace.
Obviously, Po would be a main character. He is the star of Kung Fu Panda. But if it's a crossover with, say, 'The Lion King', Simba could also be a main character. Their different leadership styles would make for an interesting story as they face challenges together.
Maybe Po will face an even more powerful villain. For example, a sorcerer who can control the elements. He'll have to learn new kung fu moves to defeat this foe.
One possible main character could be a female panda who has been secretly training in the ways of the 'Ladies of the Shade'. She might be an outcast among the regular pandas because of her association with this secret group. Another could be an older female tiger who is a mentor to the younger members of the 'Ladies of the Shade' and has a special connection to the 'lemon' element, whatever it may be in the context of the story.