In some fanfictions, there could be a new, mysterious organization that has a specific interest in Mokuton abilities. They might be researching ways to replicate or control the power, and see the prodigy as a key to their experiments. This organization could have powerful ninjas of their own and advanced technology, making them formidable foes for the Mokuton Prodigy.
The Akatsuki could be potential enemies. They might see the Mokuton Prodigy as a threat or a valuable asset to capture. Their diverse powers and motives would make for interesting confrontations with the prodigy.
Another potential character could be a new, original character created specifically for the fanfiction. This character could be a young ninja who discovers they have an affinity for the Mokuton Sage powers and has to learn to control and use them while facing various challenges in the Naruto universe.
One potential antagonist could be Orochimaru. He might be interested in Naruto's Mokuton powers for his own evil experiments. He could try to capture Naruto to study how he awakened the Mokuton and use that knowledge for his own gain.
Well, obviously the blind prodigy themselves is a key character. There could also be original characters created specifically for the fanfiction. For example, a rival who also has some sort of disability but uses it in a different way. Another potential character could be a healer who helps the blind prodigy learn to use their other senses better. And of course, existing Naruto characters like Naruto, Sasuke, Sakura, and Kakashi are likely to make appearances. They could interact with the blind prodigy in various ways, like Naruto being a source of motivation or Sasuke being a foil to the blind prodigy's more positive attitude.
A potential main character could be a long - lost relative of Hashirama who has the mokuton ability but has been neglected in the main Naruto story. This character could then embark on a journey to discover their true power and place in the ninja world.
Sasuke could be one. He already has a strong sense of focus and discipline, which could be transferred to his musical pursuits. He might be a prodigy in playing some traditional shinobi musical instruments and use the music as a way to enhance his Sharingan abilities.
Another possibility could be Sakura. Although she was in love with Sasuke, in some fanfictions, the storylines can be altered. Sakura is a strong and intelligent character, and she could potentially have a daughter with Naruto in a different narrative where their relationship develops in a new way.
A common theme is the struggle for acceptance. Since the mokuton prodigy has a rare power, they might face jealousy or suspicion from others in the ninja world. Another theme is power growth. The prodigy has to constantly train and develop their mokuton abilities.
The people who previously neglected Naruto could become his enemies. They might see his new - found power with the Keyblade as a threat.
Potential allies could be his friends like Sasuke. Sasuke, with his sharingan and combat skills, could team up with Naruto in battles against those who fear Naruto's newfound genjutsu power. Enemies might include Orochimaru. Orochimaru is always interested in powerful abilities and would likely see Naruto as a threat to his plans.
Allies would definitely include Naruto's closest friends like Sasuke and Sakura. They would stand by him even with his new identity. From the Dragon Ball world, Goku could be an ally as he has a good relationship with Beerus. Enemies could be those who want to use Naruto's connection to Beerus for their own evil purposes. For example, some rogue ninja groups might try to capture Naruto to bargain with Beerus. Also, any new villains introduced in the fanfiction who are jealous of Naruto's power would be his enemies.