The interaction between them could be really interesting. Ilya, coming from her own magical background, would show Naruto some of her unique spells and abilities. Naruto, impressed by her magic, would then try to combine it with his ninja techniques. For example, he could use Ilya's teleportation spell in a new way during a fight. And they would also have some emotional exchanges, like when Naruto shares his story of losing Sasuke and Ilya comforts him with her own understanding of loss in her world.
At the beginning, Ilya might be a bit intimidated by Naruto's brash and energetic personality. But as they spend more time together, she would grow to like him. Naruto would see Ilya as someone in need of protection and would take on that role. They would exchange stories about their respective families and friends. Ilya would introduce Naruto to her friends, and Naruto would show them some of his cool ninja moves. There would be a lot of laughter and learning as they interact with each other.
Naruto, being his curious and friendly self, would probably be excited to meet the Final Fantasy summons. He might try to befriend them immediately. For example, if he summoned a Cactuar, he would likely be amused by its appearance and try to communicate with it. Sasuke, on the other hand, would be more cautious and see the summons as tools for power. He would study them to figure out how to use them to his advantage in his quest for revenge.
The fanfiction might start with Ilya performing a summoning spell that she thought would bring something else, but instead, Naruto appears. Since Naruto is always eager to make friends and help others, he quickly bonds with Ilya. They could then embark on a journey to find a way to send Naruto back home. During this time, Naruto could teach Ilya about the importance of perseverance and believing in oneself, just like he learned in his own adventures in the Naruto world.
Naruto would probably be in awe at first. He'd try to communicate with Mothra in his usual friendly and exuberant way. He might start by introducing himself and his village, just like he did with other summons. Then he'd try to understand Mothra's powers and how they can be used to help in battles or protect the village.
Sakura would likely be a bit intimidated by BB at first. BB, on the other hand, would probably be very confident and start bossing Sakura around a bit.
In a fanfiction, they could interact in battles. The teamwork in Naruto is often based on pre - planned strategies. In Danmachi, adventurers often form impromptu teams in the dungeons. So when they fight together, they would have to learn from each other. For instance, Naruto's team might teach the Danmachi characters how to better communicate during combat, while the Danmachi characters could show the Naruto team how to adapt quickly to new and unexpected dungeon situations.
Naruto would probably be very curious about Artemis. He'd be excited to learn about her powers and her world. Artemis, on the other hand, might be a bit cautious at first. But Naruto's friendly nature would likely break the ice. He might show her some of his ninja moves, like how he can run up trees, and Artemis could show him how she hunts with her bow.
Naruto, being a very outgoing and friendly person, would probably approach Candace with enthusiasm. He might be curious about her world and the things she does. Candace, on the other hand, might be a bit cautious at first, but Naruto's positive energy would likely draw her in. They could start by sharing stories about their daily lives. For example, Naruto would talk about his training and missions, and Candace would talk about trying to keep her brothers in line.
Naruto would probably be very curious about the Jetsons' way of life. He might ask a lot of questions. George Jetson, on the other hand, would be a bit confused by Naruto's ninja outfit and abilities at first.
At the start of their interaction in the fanfiction, Batgirl would approach Naruto with a sense of wariness. But Naruto's infectious energy would soon break down that barrier. They would communicate about their different worlds, with Naruto trying to understand the concept of a city like Gotham without ninjas. Batgirl would be fascinated by the chakra system. In combat, they would have to learn each other's fighting styles quickly. Naruto might dash in headfirst, while Batgirl would be more strategic. They would need to find a balance, and through their interactions, they would develop a mutual respect. Naruto would learn from Batgirl's discipline and Batgirl would be inspired by Naruto's ability to bring out the best in people around him.
Naruto would probably be his usual energetic self, trying to figure out who Rosalina is. Rosalina, being a more calm and mysterious character, would be a bit reserved at first. But Naruto's positive attitude might make her open up. They could start by just sharing their stories, Naruto about his ninja training and Rosalina about her duties in the cosmos.