In a Naruto - in - the - Justice - League fanfiction, Naruto would bring his own set of allies too. Maybe some of his ninja friends could also get involved in certain missions. His experience in fighting against powerful foes like Akatsuki would give him insights on how to handle some of the more complex villains in the Justice League's universe. Plus, his ability to quickly learn new techniques could mean he might develop some new powers or abilities by combining his ninja arts with the technology and magic available in the Justice League's world.
Well, Naruto joining the Justice League would likely cause some cultural clashes at first. He comes from a world of ninjas with its own set of values and traditions, while the Justice League operates in a more Western superhero context. But eventually, his ability to form deep bonds with people, as he did with his friends in the Naruto world, would help him integrate well. And his chakra powers could potentially be a great asset when dealing with threats that require a different kind of energy manipulation.
One possibility is that Naruto's unique ninja skills would add a new dimension to the Justice League's combat capabilities. His shadow clone jutsu could be used for various strategic purposes, like scouting or creating diversions. His rasengan could also be a powerful offensive weapon against super - villains. Also, Naruto's strong sense of justice and his never - give - up attitude would inspire the other members of the Justice League.