They could interact in a cultural exchange kind of way. Naruto could introduce the Avengers to the concept of ninja villages, the shinobi way of life, and the importance of honor in his world. The Avengers, on the other hand, could introduce Naruto to modern technology, different forms of government, and Western values. This interaction could lead to a deeper understanding between the two groups of characters and form the basis of a great fanfiction story.
They can interact through battles. For instance, Naruto might face off against Thor in a friendly spar. Naruto's speed and agility could be pitted against Thor's strength and lightning powers.
Naruto would interact in a very enthusiastic way. He'd be in awe of the Avengers' powers and would want to learn from them. At the same time, he'd show off his own ninja abilities. He might bond with Hulk over their shared 'rage' - like Naruto has his nine - tailed fox anger and Hulk has his own. He'd also try to cheer up the more serious Avengers like Black Widow with his positive attitude. And he'd probably try to get them all to do some ninja training together.
Well, Naruto characters have unique abilities. For example, Naruto's shadow clones could be used for various strategies. Sasuke's Sharingan could detect hidden threats. They could join the Avengers to fight against Thanos. Maybe Naruto's Rasengan combined with Iron Man's repulsor technology could create a super - powerful attack.
The characters would interact in interesting ways. Naruto, being the energetic and friendly ninja, would probably be excited to meet the Avengers. He'd be in awe of Iron Man's high - tech suit and might ask him a million questions about how it works. Thor, on the other hand, might be intrigued by Naruto's connection to nature through his chakra. Captain America would likely admire Naruto's never - give - up attitude. And Naruto would probably try to get Hulk to calm down when he's angry by using his own experiences of dealing with inner demons.
The Avengers could be impressed by the magic of the Harry Potter characters. For instance, Captain America might be in awe of the Patronus charm. And the Harry Potter characters could be amazed by the Avengers' superpowers. Hermione might be very interested in Bruce Banner's scientific knowledge.
In a harem fanfic, the characters can interact through a cultural exchange of sorts. Naruto could introduce the concept of ninja clans and honor to the High School DxD characters. The female DxD characters might find this new concept fascinating and be attracted to Naruto because of it. Also, they could interact in a rescue mission. If one of the DxD characters or Naruto gets captured, the others come to the rescue. During this process, the female DxD characters would see Naruto's loyalty and courage, which would make them more interested in him as part of the harem. And of course, there could be parties or social events where they all mingle. Naruto's outgoing and friendly nature would make him popular among the female DxD characters, leading to more interactions and the development of the harem.
The ninjas from Naruto are used to a more disciplined and hierarchical structure in their village. In contrast, the Fairy Tail members are more free - spirited. So, when Naruto meets the Fairy Tail guild, there could be some initial clashes. For example, Naruto might be confused by Natsu's impulsive and hot - headed nature. When it comes to Aquarius, Naruto could be respectful of her power as a spirit. He might try to learn from her about water - based abilities, while Aquarius could be intrigued by Naruto's chakra control.
Anko could see Lemon as a potential ingredient for some kind of ninja potion or trap. Naruto, on the other hand, might just see it as something fun to play with. So Anko would be trying to use Lemon for a more practical purpose while Naruto's actions with Lemon might end up causing some comical or unexpected situations that Anko has to deal with.
The Avengers could enlist the help of the NCIS when they need to solve a mystery on Earth that doesn't require superpowers but rather good detective work. For instance, if there is a conspiracy within a government agency that is related to a potential threat to the Avengers. The NCIS agents would use their skills to dig into the files and interview suspects. In return, the Avengers could protect the NCIS agents when they are in danger during the investigation. There could be some great banter between the two groups, like DiNozzo trying to make jokes with Clint Barton about their marksmanship skills.
Ben would probably be in awe of the Avengers at first. He might try to show off his alien forms to impress them. The Avengers, on the other hand, would be cautious. Tony Stark might want to study Ben's Omnitrix. Thor could be interested in the power of Ben's alien forms that are related to strength and lightning.