The people who previously neglected Naruto could become his enemies. They might see his new - found power with the Keyblade as a threat.
Well, Naruto might use the Keyblade to gain power and respect. He could start training with it and show those who neglected him what he's capable of.
Maybe Orochimaru. He could sense the power of the Keyblade and wants to take it for himself. He would see Naruto as an easy target to steal it from since Naruto doesn't really understand its value at first.
It might also be possible for new characters to be the main characters in this fanfiction. For example, a young ninja who discovers a Keyblade and has to learn how to use it while also dealing with the politics and power struggles in the Naruto universe. They could be from a minor clan but rise to prominence through their Keyblade skills.
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.
Well, perhaps Naruto could discover the Keyblade in a hidden realm within the Naruto world. He's neglected it because no one around him knows what it is. Then he has to figure out its powers on his own, like how to use it for combat or to unlock special portals.
Iruka could be a potential ally. He has always had a bit of a soft spot for Naruto. Even in the face of Naruto being neglected, Iruka might step up more and offer more than just basic support. Another could be Shikamaru. He is smart and might see the value in Naruto that others are missing. He could help Naruto strategize to get out of his neglected situation.
Well, he'd probably be an even more powerful force. The Keyblade has its own unique powers and abilities. Naruto's already strong ninja skills combined with the Keyblade could make him nearly unbeatable. He might use it in combat in ways similar to how he uses his ninja tools, but with added magical elements. For example, he could use his chakra to enhance the Keyblade's attacks.
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.
Maybe a foreign ninja who has a similar experience of being ostracized in their own village. They cross paths with Naruto and together they form an alliance. This foreign ninja could have unique abilities that Naruto learns from, and they both work towards changing the way they are perceived in their respective worlds.
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.