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.
Well, perhaps there could be a love triangle. Po has feelings for Tigress, but Tigress is focused on her kung fu duties. Meanwhile, a new character, a male tiger from another land, also shows interest in Tigress. Po has to prove his worth not just as a kung fu master but also as a potential partner, and in the process, he discovers more about his own heart and what true love means.
The plot could be that the human girl is a prodigy in a different form of martial arts. She hears about the great kung fu in the Valley of Peace and decides to go there to learn more. Once there, she challenges Po to a friendly spar. Po is initially taken aback but then realizes she has a lot to teach him too. Their sparring sessions become a regular thing, and the girl slowly gets integrated into the group. She then uses her unique martial arts style to help them when a new villain arrives who is immune to traditional kung fu techniques.
A plot could involve a villain who has the ability to steal powers from both universes. So Batman and Kung Fu Panda characters team up. Po's positive attitude and Batman's strategic mind work together to outwit the villain. They travel between Gotham and the Valley of Peace, using their unique skills to track down the villain. The Furious Five might also have to adapt to Gotham's dark alleys while Batman has to get used to the more light - hearted and spiritual nature of the Panda world.
Maybe in the fanfiction, a human kung fu master travels to the Valley of Peace where Po lives. The human is initially skeptical of Po's abilities because he's a panda. But Po challenges him to a friendly sparring match and easily defeats him. This makes the human realize that there's more to kung fu than just physical appearance. They then team up to face an ancient evil that threatens both the human world and the Valley of Peace. Along the way, they exchange their knowledge of different fighting styles and learn from each other.
The plot could also involve a competition. The ninjas from Naruto's world are invited to a grand martial arts tournament in the Kung Fu Panda world. Naruto, Sasuke, and the others compete against Po, the Furious Five, and other kung fu masters. Along the way, they learn from each other's fighting styles and develop new techniques.
A story could revolve around a prophecy that involves both worlds. Po and the RWBY team are brought together by this prophecy. They must find a set of ancient artifacts that are scattered across both the Kung Fu Panda universe and the RWBY universe. As they search, they face various challenges and also learn about each other's cultures and powers.
In a fanfiction, the Wu Sisters might be training one day and a strange lemon - like object falls from the sky. They soon realize that it has the ability to transport them to different dimensions within the Kung Fu Panda world. They use this power to explore new places and learn new Kung Fu techniques. However, they also face the risk of getting lost in these dimensions and have to rely on their sisterly connection to find their way back home.
One possible plot could be that the Turtles end up in the Valley of Peace. They meet Po and his friends. Po is initially shocked by these strange new creatures but quickly realizes they all share a love for kung fu. Together, they have to face a new villain who has the power to disrupt both their worlds. The Turtles' unique fighting styles combined with Po's clumsy yet effective kung fu could make for some great action scenes.
The plot could involve a mystery. There are strange disappearances in the Valley of Peace, and Viper and Crane are the ones to investigate. As they dig deeper, they find that an old enemy of the Furious Five has returned and is using a new kind of dark magic. They have to use their combined skills and wits to stop this enemy. Along the way, they might also discover secrets about their own pasts and how they came to be part of the Furious Five.
It would be a whole new adventure. Maybe as a human kung fu master, he'd have to deal with the politics of the human kung fu world. There could be different schools vying for dominance, and Po, with his unique style, would have to find his place. He might struggle more with self - doubt as a human, but his determination would still shine through. His story could also include a love interest, which would add another layer of complexity to his journey.