Friendship is also a big theme. The characters from Naruto and 'Shake It Up' usually form unlikely friendships. For example, Naruto's determination and loyalty might inspire the 'Shake It Up' characters, and in return, their carefree and creative approach to life could influence Naruto. Another theme could be self - discovery. As the characters are exposed to a new world, they often learn new things about themselves. For instance, a 'Shake It Up' character might discover a hidden strength when faced with the challenges of the Naruto world, like learning to be brave in the face of danger, much like how Naruto is in his own world.
Adaptation is a very common theme in 'naruto and shake it up fanfiction'. The characters have to adapt to a completely different environment. Naruto has to adapt to a world without ninjas but with dancing as a major form of expression. The 'Shake It Up' characters, if they end up in the Naruto world, have to adapt to the presence of ninjas, chakra, and the constant threat of danger. This theme of adaptation allows for a lot of character development and interesting plot twists as the characters struggle to fit into a new and strange world.
One common theme is the clash of cultures. Naruto comes from a world of ninjas with strict hierarchies and combat - based skills, while 'Shake It Up' is about modern - day dancing and teen drama. So there's often a theme of how these two different cultures interact and learn from each other.