Well, the simplest way is through a magical portal. A character from either world accidentally stumbles through it and ends up in the other world. Then they have to adapt and learn about the new place while also sharing elements of their own world.
Perhaps a prophecy in the Naruto world predicts that a special form of art from another dimension (the dancing in 'Shake It Up') will be the key to saving their world from a great disaster. So some Naruto characters travel to the 'Shake It Up' world to learn about this art form and bring it back to their own world, thus blending the two in the process.
One way is through the power systems. Naruto has chakra, while Shendu has his own brand of magic. The fanfiction could explore how Naruto's chakra could interact with Shendu's magic. Maybe Naruto could use his chakra to enhance or counteract Shendu's spells. Another aspect could be the characters' personalities. Naruto's optimistic and determined nature could contrast with Shendu's more devious and power - hungry personality, creating interesting story dynamics.
It can blend the two worlds by having the droids use their technological features in the wizarding world. For example, a droid's built - in map system could be used to navigate the complex corridors of Hogwarts. The droids could also introduce new concepts like energy sources that wizards might be able to adapt for their magic.
The blend often occurs at a character level too. Characters from both series might form alliances or rivalries. A friendship between Legolas and Hermione could develop, with each sharing their knowledge of their respective worlds. Or perhaps Snape and Saruman could be pitted against each other, their cunning and knowledge of dark magic making for a great showdown. These character interactions help to bring the two very different worlds of 'Lotr' and 'Harry Potter' together in the fanfiction.
In terms of clothing, the Naruto characters could start wearing some Pokemon - themed accessories. Like a Pikachu - shaped headband. And Pokemon trainers could start wearing ninja - style shoes for better movement. Also, the ninja clans could adopt the concept of Pokemon evolution in their training. Younger ninjas could be seen as the 'unevolved' forms and as they grow and gain more skills, they 'evolve' into more powerful ninjas.
One way is through the education system. The ninja academy in Naruto could start teaching about Pokemon. Young ninjas would learn about different Pokemon types and how to handle them. In the Pokemon world, trainers could learn some ninja skills like stealth and how to use shurikens. Another aspect is the clothing. Naruto could start wearing a Pokemon - inspired jacket, and Pokemon trainers could don ninja - like boots.
One way they blend the two is through the power systems. The chakra in Naruto and the Blade system in Xenoblade Chronicles 2 can be combined in fanfictions. Maybe a character from Naruto can somehow gain the ability to resonate with a Blade, or a Blade can be powered by chakra. This creates new and exciting storylines where the rules of both universes are bent and merged.
To blend their universes well, start with a believable crossover event. For example, a mysterious portal could open between the two worlds. Then, focus on the characters' reactions. Naruto would be curious and eager to explore, while Zero Two might be more cautious but also intrigued. Their different personalities can drive the story as they learn about each other's worlds.
It blends the Japanese - influenced ninja culture from Naruto with the religious and cultural elements of Christianity represented by Jesus. For instance, Naruto's training and his pursuit of becoming Hokage could be paralleled with Jesus' journey of spreading his teachings.
It can blend the powers by having characters use Devil Fruit abilities in the context of Naruto's combat system. For example, using Devil Fruit - based speed or strength enhancements during a taijutsu fight. The bloodline aspect could come in where certain families have an affinity for specific Devil Fruits, and they train to combine their bloodline - related chakra control with the fruit's power.
It could blend the two worlds by having a common enemy. Let's say a powerful being that threatens both the ninja world and the world of Greek mythology. Percy and the Naruto characters would have to team up. The Mokuton abilities could be used in unique ways to fight this enemy. For instance, creating huge wooden barricades to hold off the enemy's attacks while Percy uses his powers to strike from a distance. The two worlds' cultures and powers would mix as they strategize together.