There could be an internal enemy within the village as well. Maybe someone who is power - hungry and sees Naruto Jade's dad as an obstacle to their rise to power. This person could spread false rumors about him or try to frame him for something he didn't do.
A group of bandits who operate near the village could also be enemies. They might target Naruto Jade's dad because he is a threat to their illegal activities. They could try to ambush him or attack the village to get to him.
He could be a new character entirely, created specifically for this fanfiction. Maybe he's a powerful mage who has been living in seclusion but now has to step out to help the Young Justice due to some prophecy.
Well, it could be about his dad's early life. Maybe he was a great ninja in his youth, trained under a famous master. His adventures during his training days, like facing tough opponents and learning unique jutsus, could be part of the story.
The Akatsuki could be potential enemies. They might see Naruto's little sister as a way to get to Naruto. Maybe they think they can use her as a hostage or extract some information from her about Naruto or the Nine - Tails. Another enemy could be some of the rogue ninja who are after the bounty on Naruto's head and see his sister as an easy target to get to him.
The Akatsuki could be potential enemies. They are always on the lookout for strong ninja to either recruit or eliminate. Since Kakashi is a well - known and powerful ninja, his little brother might draw their attention. They could see him as a potential threat or a valuable asset.
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.
A new dark wizard could rise. This wizard might be jealous of the fame and power that Harry has, and seeing his daughter as an extension of that, decides to target her. Maybe this new dark wizard is seeking to gain control over the wizarding world and sees her as a key obstacle in his path.
The First Order could still be a threat. They might see her as a symbol of the Resistance and try to eliminate her. Or it could be a new Sith cult that has risen in the ashes of the old Sith order.
There could be a new dark wizard or witch who is jealous of the Potter family's legacy. They might target Harry Potter's daughter to try and bring down the family name and prove their own power.
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.