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.
Perhaps there could be a plot where an ancient prophecy in both the TMNT and Kung Fu Panda universes is discovered. It foretells of a group of heroes from different worlds coming together to defeat an ultimate evil. The TMNT and Po's group are the ones mentioned in the prophecy. At first, they struggle to work together due to their different ways of doing things. The Turtles are used to the sewers and stealth, while Po and his friends are more about open - air kung fu in the valley. But as they train together and learn from each other, they become a formidable force and are able to face the great evil that the prophecy warned about.
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.
The interaction between Raphael and Po would be really interesting. Raphael is hot - tempered and Po is kind of clumsy but also very confident. They could start off butting heads but then learn to respect each other's fighting abilities. Also, Donatello and Mr. Ping could be fun. Donatello would be fascinated by Mr. Ping's noodle - making skills and might even try to incorporate some of the techniques into his inventions.
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 great 'tmnt and kung fu panda fanfiction' is 'The Unlikely Alliance'. It combines the two universes in a really cool way, with the Turtles and Po teaming up to fight a common enemy. Another good one is 'Cross - Dimensional Training' where the characters from both franchises learn from each other's fighting styles.
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.
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.
Another concept is that the spirit animals in the Kung Fu Panda world are somehow related to the tailed beasts in Naruto. For example, Po discovers that he has a connection to the Nine - Tailed Fox within Naruto. They have to work together to balance the power of these spirits and beasts to prevent chaos in both universes. This could involve a lot of training sequences where they learn from each other's combat styles and philosophies.
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 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.
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.