In the fanfiction, Ash may face the challenge of range. If Dawn is far away from him, his aura might not be able to reach her in time to protect her. Also, if he has to face an enemy who can manipulate or counter his aura, it would be really difficult for him to protect Dawn. For example, if there is a villain who can send out waves of negative energy to disrupt Ash's aura, he would have to find a way to overcome this while still keeping Dawn safe.
In this fanfiction, Ash's aura could be like an invisible shield around Dawn. His strong connection with his aura allows him to project it towards her. If there are any attacks, whether physical or from special abilities, the aura could absorb or deflect them. It's as if the aura becomes a safeguard that he can manipulate to keep Dawn safe.
The Pokemon might not be ready to evolve yet in terms of its mental state. It could be afraid of the change or not fully understand the concept of evolution, so Ash has to work on getting it to be more confident and accepting. This could involve special training or bonding experiences.
One challenge could be the strength of the Kumo ninjas. They are known for being tough. Naruto might have to face some powerful jutsu from them. Another challenge could be the distance. If Kushina is held deep in Kumo territory, it would be hard for Naruto to reach her without being detected.
The unique bond between Ash and Dawn. Their different personalities and their shared adventures in the Pokémon world make for great storytelling in fanfiction. The concept of aura adds an extra layer of mystery and power to their relationship, which is very appealing.
One challenge could be mastering the balance between different elements. Each element has its own characteristics, and it's not easy to control them all harmoniously.
One challenge could be the strength of the enemy. If the enemy is very powerful, it would be difficult for Aang to overcome them alone. Another challenge might be the lack of resources. He may need certain items or help from others to save the Airbenders but not be able to get them easily.
One challenge could be controlling it. Haki is a different kind of power compared to chakra, so Naruto would have to learn how to regulate the flow and intensity of his haki. For example, if he uses too much haki at once, it might drain him quickly.
Robin may also face internal challenges. For instance, if he's doubting his own abilities or if he's emotionally affected by seeing Starfire in danger. This could cloud his judgment and slow down his reaction time. And if Red X has some sort of new weapon or power that Robin is not aware of, that would be another significant challenge in his mission to save Starfire.
Another problem might be the lack of proper resources. Even if Naruto has the ability to heal, he may not have all the necessary herbs or medical equipment. In the world of Naruto, some healing requires specific items. If they are in a remote location or in a battle - torn area, getting these resources could be a huge hurdle.
The sword could attract dark forces. Since it's a powerful weapon, it might act like a magnet for dark wizards or evil creatures. Harry then has to constantly defend himself and the sword from these threats, which can be really difficult especially if he's not fully trained in sword combat.