They could interact through a mutual respect for each other's powers. Naruto might be in awe of female Aquaman's ability to communicate with sea creatures and control the waters, while she could be impressed by his ninjutsu. For example, Naruto could use his shadow clone jutsu to help her herd a group of unruly sea monsters that are causing trouble near a coastal village.
In a fanfiction, their interaction could start with a clash. Say female Aquaman mistakes Naruto for a threat to the ocean when he's on a mission near the shore. But when Naruto explains his purpose (like protecting the village from a sea - based threat that is also affecting the land), she realizes they can help each other. So they join forces and during their time together, they exchange stories about their respective worlds. Naruto tells her about the Hidden Villages and the Hokage, while she shares tales of Atlantis and its wonders.
Percy would probably be in awe of Aquaman's pure Atlantean powers at first. He might be a bit jealous as well, since he's just a demigod with limited underwater abilities compared to Aquaman. Aquaman, on the other hand, would be curious about Percy's connection to the Greek gods. They would start off a bit cautious around each other, but as they face common threats in the ocean, like pirates using dark magic or sea creatures gone berserk, they would gradually start to trust and rely on each other.
They might start by comparing their weapons. Percy with his sword Riptide and Aquaman with his trident.
One idea could be a crossover where Naruto is on a mission near the ocean and stumbles upon female Aquaman. They initially have a misunderstanding and end up in a battle. But as they fight, they realize they both have a strong sense of justice. So they team up to face a common enemy, like an underwater demon that is threatening both the land and the sea.
They could also have a mentor - mentee relationship in a way. Naruto, with his experience in combat and growth, could offer advice to Ophis on how to better control her power. Ophis, with her knowledge of the DxD world's magic and power systems, could teach Naruto some new skills or ways to enhance his chakra. This exchange of knowledge and experience would create a unique dynamic between them.
In a more in - depth interaction, if Clayface were to get injured in the Naruto universe, Naruto could offer to help him. Naruto's knowledge of medical ninjutsu might be able to heal Clayface in some way. This would create a bond between them as Clayface would be grateful. They could then exchange stories about their respective worlds, with Naruto telling Clayface about his life as a shinobi and Clayface sharing his experiences in Gotham.
Naruto could be initially attracted to Frostmourne's power. He might touch it and start to feel a strange connection, but then quickly realizes the danger it poses.
In the fanfiction, Naruto could also team up with other characters from the Dementor - related world. He could combine his ninja techniques with their magic to combat the Dementors more effectively. For instance, he could work with a wizard who knows a lot about Dementors and together they could develop new strategies to keep the Dementors at bay. His ability to make friends and form strong alliances would be very useful in this scenario.
At first, they might be cautious around each other. Aquaman, being the king of Atlantis, would be wary of this strange demigod from the surface world. Percy, on the other hand, would be in awe of Aquaman's power and the strange underwater world. But as they face challenges together, like fighting off some menacing sea creatures or stopping a villain who wants to control the ocean, they would start to respect and rely on each other. Percy might crack some jokes to lighten the mood, which Aquaman might find strange at first but then start to appreciate as a sign of Percy's courage.
Aquaman's ability to control the sea could be used to create massive water - based defenses around Hogwarts. In return, Harry could use magic to give Aquaman the ability to breathe air indefinitely when he's on land for extended periods. Their powers could also combine in a more offensive way. For instance, Harry could use a levitation spell on Aquaman while he's in the water, allowing Aquaman to attack enemies from above the water surface with his enhanced speed and strength.
Naruto's chakra - based powers and Maleficent's dark magic could either clash or combine. For example, Naruto could use his Rasengan, and Maleficent could add her dark magic to it, creating a super - powerful attack. Or their powers could be in opposition, like Naruto's life - affirming chakra against Maleficent's death - dealing magic.