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.
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 idea could be that the OC is a new student at the Jade Palace. Tigress is initially skeptical but as they train together, they start to respect and eventually fall in love with each other. They face challenges together like a new threat to the Valley of Peace.
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.
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.
In Kung Fu Panda, inner peace is a central concept. It's about finding a calm within oneself, like Po did. In RWBY fanfiction, writers might incorporate this idea by having characters face their inner demons and reach a state of calm. For example, a character could be in a battle and suddenly find inner peace, which gives them an edge. This can be a really interesting way to explore the characters' growth and development in the RWBY universe based on the concept from Kung Fu Panda.
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.
One possible plot could be that a villain from the Naruto universe uses a powerful jutsu to open a portal to the Kung Fu Panda world. Then, Naruto and his friends follow the villain into that world. There, they meet Po and his friends. Together, they have to learn from each other's fighting styles to defeat the villain who has become even more powerful by absorbing some of the chi in the Kung Fu Panda world.
One possible plot could be that Tai Lung somehow returns, not fully evil this time. Tigress, initially suspicious, gradually discovers that Tai Lung has had a change of heart after his time in prison. They could team up to face a new, greater threat to the Valley of Peace. Maybe a dark sorcerer has emerged and their combined skills are needed to defeat it.
One possible plot could be that Po and Viper go on a special mission together outside the Valley of Peace. They encounter a new villain who has a unique fighting style that combines elements of ice and wind. Po's clumsy yet powerful moves and Viper's swift and flexible attacks would make for an interesting dynamic as they try to figure out how to defeat this new threat.
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.