Lex Luthor could be a great antagonist. He's always looking for power and knowledge. If he discovers Naruto's abilities, he might try to use them for his own gain or see Naruto as a threat to his plans in Smallville.
One idea could be that Naruto is somehow transported to Smallville. He could use his ninja skills to help Clark Kent deal with some of the more dangerous villains in Smallville. For example, when Clark is having trouble with a kryptonite - enhanced foe, Naruto's speed and combat skills could come in handy.
In Smallville slash fanfic, a frequent theme is the transformation of relationships. It could be from friendship to something more romantic or a shift in the power balance. Also, the theme of secrecy is common. Since their relationship is not part of the mainstream story in the show, the characters often have to keep it a secret. And there's the theme of sacrifice. Characters may sacrifice their own desires or goals for the sake of the relationship, which adds a layer of depth to the stories.
A common theme is the exploration of relationships. When a character is pregnant in the 'Smallville' fanfic, it often shows how the relationship between the pregnant character and their partner evolves. Another theme could be the challenges that come with the pregnancy, like how to balance normal life in Smallville with the upcoming new addition to the family.
The interaction between Batman and Clark Kent is also quite unique. Clark is still growing into his Superman identity in Smallville, and Batman's presence can either be a source of inspiration or a challenge. They might have different views on how to use their powers for good, and exploring these differences is a great part of the fanfic.
Character interactions are also very interesting. Naruto is this energetic and determined ninja, while Clark is a more reserved superhero. Their different personalities can lead to some great dialogue and character development in fanfiction. Moreover, the contrast between the ninja world of Naruto and the small - town - with - a - big - secret world of Smallville offers a rich backdrop for stories.
The cultural differences are also a big part. Naruto comes from a feudal Japanese - inspired world, while Smallville is set in a more modern American - style town. Fanfictions often explore how Naruto adapts to this new culture and how the Smallville characters react to his foreign ways. It can lead to some really funny and heartwarming moments. For instance, Naruto trying American food for the first time in a Smallville diner.
Well, one unique aspect is the combination of two very different power systems. Naruto has his chakra - based ninjutsu and Smallville has superpowers like Clark's super strength and flight. Writers often play around with how these powers interact.
One idea could be a crossover where Naruto characters end up in Smallville. For example, Naruto could use his ninja skills to help Clark Kent deal with some of the strange threats in Smallville that his superpowers alone can't handle easily. Another idea might be a story where the Kryptonite in Smallville has an unexpected effect on Naruto's chakra, leading to new and unique powers for him. Or perhaps a fanfiction where the characters from Smallville learn about the ninja world and decide to train like ninjas to gain new skills.
There probably is. In the world of fanfiction, anything is possible. A sister for Clark Kent in a Smallville fanfic could be a great way to introduce new conflicts and character development. For example, she could be jealous of Clark's powers, or she could be his confidante. The possibilities are really only limited by the imagination of the writer.