What are the common themes in 'naruto invader zim fanfiction'?
One common theme is the clash of cultures. Naruto's world of ninjas with its honor and traditions is very different from Zim's world of aliens and wacky technology. So, stories often play with how these two different cultures interact.
Another theme is the idea of friendship or rivalry. Given the strong - willed nature of both Naruto and Zim, they could either become friends (in a very strange way) or bitter rivals. Some fanfictions explore how they might compete or cooperate depending on the situation. Also, the theme of saving the world or at least their own little corners of it is quite common. Whether it's Naruto protecting the Hidden Leaf or Zim trying (and failing most of the time) to take over Earth, these goals often get intertwined in the fanfiction.
The exploration of power is also a major theme. Naruto has his chakra and various jutsus, while Zim has his alien gadgets. Fanfictions might show how these powers are used when the two universes collide. It could be a matter of one character being in awe of the other's power, or they might try to find a way to combine their powers to achieve a common goal. There's also the theme of misunderstandings due to the different natures of their worlds, which often leads to comical or tense situations in the stories.
