Isolation is also a theme. Naruto has always craved acceptance. If he is pushed into a corner and isolated completely, he may turn to villainy. He might think that if the world won't accept him as he is, he'll make the world fear him. This theme can explore the psychological effects of loneliness and rejection on a character as powerful as Naruto.
Betrayal is a common theme. Naruto might be betrayed by his friends or the village he once trusted, which pushes him towards villainy. Another theme is power corruption. His great power could be corrupted by external dark forces or his own inner turmoil. For example, if he's constantly ostracized despite his good intentions, he might start to use his power in a more self - serving and harmful way.
Power corruption is a common theme. Just like in many stories where Naruto turns into a villain, it often starts with him getting too much power too quickly and it corrupts his ideals. Another theme is betrayal. For example, if he's betrayed by the village, he might turn to the dark side.
One common theme is redemption. The villain may start to change because of the reader. For example, in many fanfics, the reader's kindness or unique perspective makes the villain question his evil ways. Another theme is the allure of the forbidden. Since the villain is, well, a villain, the relationship with the reader is often seen as something that shouldn't happen but still does. And power dynamics is also a theme. The villain usually has a certain amount of power which affects how he relates to the reader.
A frequent theme is 'Time - Travel'. In these fanfics, a character, often Naruto, travels back in time and tries to change the past. This allows for a whole new set of adventures and interactions. Another common theme is 'The Ninja World's Politics'. Fanfic writers explore how the different hidden villages interact, form alliances, and compete for power in more detail than in the original series.
One common theme is the struggle between love and loyalty. Audrey may be in love with the villain, but she also has her own sense of right and wrong, so there's often a conflict. Another theme is redemption. The villain might change for the better because of Audrey's love.
One major theme is the struggle for power. In 'hotaru naruto fanfic', Hotaru could be striving to become stronger, either to protect her loved ones or to prove herself. Also, the theme of loyalty is quite prevalent. She might have to choose between different groups or individuals and show her loyalty in various situations. For instance, she could be torn between her loyalty to her village and a new friend from another place. This creates interesting storylines.
One common theme is adventure. Since Naruto is always up for an adventure and Shion's powers can add an interesting element to their quests. For instance, they might go on a journey to stop a new evil force using Shion's prophetic abilities and Naruto's combat skills.
One common theme is the clash of different worlds. Since Naruto is from a ninja - based world and Kirito from a virtual - world - based story, the fanfics often explore how these two different settings interact.
One common theme is power acquisition. For example, a character getting the power of airbending and how they learn to control it. Another is the clash of cultures. Since Naruto has its own unique ninja culture and airbending comes from the Avatar world, there can be a lot of interesting interactions between the two. And sometimes, friendship is a big theme too, like how characters from both worlds form bonds while dealing with the new concept of airbending.
A third common theme is the chaos that Deadpool brings into Naruto's world. Deadpool is unpredictable and often causes mayhem in the usually orderly (in its own way) ninja world. This upheaval and how the Naruto characters deal with it is a major theme in many of these fanfics. Sometimes it's played for laughs, other times it's used to explore deeper concepts about order and chaos.