A really cool concept could be that there's a magical artifact in the Young Justice universe that has the power to summon heroes from other dimensions, and it summons Naruto. Naruto then has to work with the Young Justice team to protect this artifact from falling into the wrong hands. Along the way, he discovers that his own ninja skills can be enhanced with the magic in this new world, creating some unique and powerful combat moves.
One idea could be that Naruto is somehow transported to the Young Justice universe and his chakra is mistaken for a form of magic. This could lead to some interesting team - ups and misunderstandings as the Young Justice characters try to figure out who Naruto is and what his 'magic' can do.
In this type of fanfiction, magic could play a role in character development. For Naruto, experiencing a different type of power system like magic in the Young Justice world could make him question his own ninja way. He might start to adapt some of the magic concepts into his own fighting style. And for the Young Justice characters, learning about Naruto's 'magic' (chakra) could open their eyes to new ways of thinking about power and how to use it more effectively.
A fanfiction about Naruto and Batgirl in the Young Justice setting could explore different themes. It could be about cultural exchange, as Naruto comes from a very different world than the DC universe. Their combined efforts could also be centered around protecting the innocent. Maybe they have to stop a powerful villain who is threatening both the ninja world Naruto comes from and the Young Justice world. Their different abilities would be crucial in this fight, with Naruto using his Rasengan and Batgirl using her Batarangs and martial arts skills.
Naruto would be a bit of a wild card at first. His brash and head - strong nature might clash with some of the more reserved members of the Young Justice team, like Aqualad. But his determination and loyalty would also be something that the team could quickly come to respect. He would probably befriend Superboy quickly as they both have a bit of an outsider feel.
One challenge is getting the characterizations right. Naruto has a very distinct personality and set of abilities from the Naruto universe, and the Young Justice characters also have their own established traits. Writers need to make sure they stay true to these while also making the crossover believable.
A possible plot could involve Naruto characters being transported to the Young Justice universe. For example, Naruto himself could end up in Mount Justice. His unique abilities like the Rasengan would shock the Young Justice team. They might initially be suspicious of him, but as they see his determination to protect, they could start to work together. Maybe Naruto would learn about the different powers and technology in the Young Justice world, and in turn, teach them about chakra.
Some characters like Superboy might be a bit jealous of Naruto's natural charisma and the way he can easily make friends. But as they face challenges together, they would start to respect each other. Naruto would be fascinated by Superboy's strength. The more magical characters in Young Justice might be interested in how chakra is related to magic in Naruto's world. And Naruto would be eager to learn about their magic. There could be a lot of cultural exchange between the two groups, which would lead to some really interesting character interactions.
One possible plot could be that the Young Justice team somehow gets transported to the Naruto universe. They could team up with Naruto and his friends to fight a common enemy like Orochimaru, who has somehow managed to get his hands on some advanced Young Justice tech. This would create an interesting dynamic as the two groups learn from each other's fighting styles and powers.
One possible plot could be that Naruto is somehow transported to the Young Justice universe. He teams up with the Young Justice team. Naruto's unique jutsu skills like the Rasengan could be used to fight the villains in the Young Justice world. Maybe they face a common enemy that requires both Naruto's ninja abilities and the superpowers of the Young Justice members to defeat.
Robin's intellect and strategic thinking along with Shikamaru's own intelligence would be quite something. They could plan elaborate battle strategies. Robin could use his knowledge of technology and gadgets to set up traps, and Shikamaru could use his understanding of the terrain and ninja tactics. Together, they could outwit even the most cunning of enemies. Also, Aqualad's water - based powers could be enhanced by the water - related jutsu in the Naruto world. He could learn new ways to manipulate water from the water - style ninja.
A more complex plot could be that there is a prophecy in both universes that foretells of a combined force from both Naruto's world and the Young Justice world being the only thing that can stop an upcoming great evil. This would lead to a series of events where characters from both sides have to learn to trust and work together. Naruto could bring his friends from Konoha, and together with the Young Justice team, they would train and strategize to face this ultimate threat.