The plot could start with Ace being in trouble in the Justice League's world. Maybe he's been captured by an enemy of the League. Naruto somehow gets wind of this and decides to help. He travels to the Justice League's realm and starts his search for Ace. Along the way, he meets some of the Justice League members who are initially skeptical of him but then see his potential. Together, they find Ace and Naruto uses his jutsu to defeat the bad guys and free Ace.
The plot could be complex. Firstly, there could be a multiverse - related event that brings Ace into the Justice League's domain. Naruto, from his own universe, senses the disturbance and follows. When he arrives, he discovers that Ace is being held by a powerful and unknown entity that the Justice League is also having trouble with. Naruto would need to learn about the Justice League's powers and weaknesses, as well as the nature of the threat to Ace. He would then use his own ninja training and skills, such as his ability to gather and control chakra, to develop a plan. Maybe he would create a diversion using his clones while he sneaks in to rescue Ace. And during this process, he might also teach the Justice League some new combat strategies based on his ninja techniques.
In this fanfiction's plot, there could be a rift in the space - time continuum that brings Naruto to the DC Universe where the Justice League exists. The League is in chaos as their powers are being nullified by a strange force. Naruto, being a stranger to this world, starts exploring and discovers the source of the problem. He uses his own chakra to create a shield around the League members to protect them from further harm. Then, he embarks on a journey to find a way to restore their powers. Along the way, he bonds with the League members, and they learn from each other. Finally, Naruto figures out a way to reverse the nullifying force and the Justice League regains their powers and they all defeat the ultimate evil behind it.
Well, in a fanfiction, anything can be possible. Naruto's skills like his shadow clones and Rasengan could potentially be used to rescue Ace. Maybe he uses his speed to get through the Justice League's defenses, which are set up around Ace for some reason. And then he uses his clones to create a distraction while he frees Ace with his combat abilities.
In the plot of such a fanfic, it might begin with Naruto already having knowledge of the Justice League. Maybe through some sort of prophecy in his own world. He decides to test his skills against them. He travels to their universe and challenges them one by one. For Superman, he could use his chakra to create a powerful energy shield that can withstand Superman's heat vision and then use his Rasengan to send him flying. Against Batman, he uses his ninja stealth to avoid his gadgets. With Aquaman, he uses his water - walking and water - based jutsu to overpower him. As he progresses through the battles, he gains more confidence and eventually defeats all of the Justice League members, proving himself as a formidable fighter even in a different universe.
One possible plot could be that Naruto somehow gets transported to the DC universe where the Ace Justice League exists. He could initially be seen as a threat due to his strange powers. But as they get to know him, they realize his good intentions. Naruto could teach the League some of his ninja techniques, like how to use chakra to enhance their physical abilities. And in return, the League could introduce Naruto to advanced technology and different ways of justice in their world.
If we consider a fanfiction of Kyuubi Naruto and the Justice League, the cultural differences between the two universes would add depth to the story. Naruto's world is filled with ninjas, chakra, and elemental powers. The Justice League, on the other hand, has heroes with superhuman abilities based on different concepts. When combined, Naruto might have to adapt to the more modern and high - tech world of the Justice League. At the same time, the League members could learn about the importance of honor and loyalty in Naruto's world. It could lead to some really cool character development and epic battles.
It could have Naruto characters in the Justice League universe. Maybe Naruto uses his shadow clone jutsu to confuse the villains that the Justice League is facing. And Superman might be intrigued by Naruto's chakra powers.
Well, it could be really cool. Maybe Naruto and his friends could team up with the Justice League to fight a common enemy. For example, they might face a powerful villain who has the ability to control both chakra and some kind of super - power from the DC universe. Naruto could use his Rasengan while Superman uses his heat vision in a joint attack.
A typical plot could start with Akeno in some sort of danger, like being attacked by an enemy in a strange new world. Naruto, who is either accidentally transported there or on a mission, notices her plight. He then uses his ninja skills, like his shadow clones or Rasengan, to fight off the attackers and save Akeno. After that, they might form an alliance or friendship and continue on an adventure together.
Well, it could be that Naruto uses his shadow clone jutsu to overwhelm the Justice League members. Maybe he'd start with Batman, using his speed and clones to catch him off guard. Then for Superman, he might use some of his more powerful jutsu like the Rasengan, powered up with Sage Mode. But it's really a wild and crazy concept as the two universes are so different in power scales and nature.
In this fanfiction, Robin could be saving the Justice League from a threat that they didn't see coming. For example, a mind - controlling parasite that has infected some of the members. Robin, being the smart and resourceful character he is, figures out a way to neutralize the parasite. He might have to go through a series of challenges, like sneaking into a heavily guarded enemy base, decrypting complex codes to find the antidote, and then distributing it to the affected League members.