A group of rogue ninjas from Naruto's world who somehow also end up in the DxD world could be the antagonists. They might be corrupted by the newfound power in the DxD world and start causing chaos. They oppose Naruto because he wants to stop their evil deeds. Ravel and Naruto then have to work together to take them down. This would create an interesting dynamic as Naruto has to fight his own kind who have gone astray.
An ancient evil entity sealed long ago in the DxD world could be awakened by Naruto's arrival. This entity, seeing Naruto's power, wants to use it to break free completely. It starts to manipulate events and turn other characters against Naruto and Ravel. The entity could have the ability to possess other beings, making it difficult to identify and fight directly.
It could be a powerful devil who doesn't like the idea of an outsider like Naruto in their world. This devil might see Naruto as a threat to the power balance and wants to eliminate him before he can form strong alliances. He could be a high - ranking noble devil who has his own dark plans for the DxD world and Naruto's presence is ruining it.
One possible fanfic could be about Ravel from Highschool DxD finding herself in the Naruto world. Maybe she could use her unique abilities, like her magic skills, to interact with the ninjas. For example, she might befriend Naruto and help him with a difficult mission using her magical powers to provide an unexpected advantage.
I really liked the fanfiction titled 'Ravel's Destiny'. In this one, Ravel discovers a hidden power within herself. The story has great plot twists and the author does an excellent job of keeping Ravel's personality true to the original while also adding new dimensions to her character.
A possible scenario is that Ravel teams up with Naruto to fight a common enemy. Ravel's magical abilities and Naruto's ninjutsu would make for an interesting combination. They could learn from each other's fighting styles during their battles, and their friendship could grow as they face challenges together.
Maybe an evil sorcerer who has mastered both dark magic and some forbidden ninja techniques. He plans to use the chaos that would ensue from merging the two worlds to his advantage. He would be against Naruto and Gabriel because they stand in the way of his evil plans. He could start by creating unrest in the Highschool DxD world, pitting different factions against each other, and then try to use Naruto's presence as a scapegoat. Gabriel, being an angel of justice, would naturally oppose him, and Naruto, with his sense of loyalty and protecting others, would join her in the fight.
One idea could be that Naruto, through some sort of interdimensional rift, ends up in the world of Highschool DxD. Ravel could be intrigued by this strange new being with his unique powers. Maybe Naruto has to team up with Ravel to face a common enemy in the DxD world, like a rogue group of devils. His ninja skills would be a novelty there and could help them in battles.
Naruto and Ravel might start off as strangers. Naruto would be the curious outsider, and Ravel would be intrigued by his different appearance and powers. Then, Naruto could interact with other DxD characters. For example, he might have some friendly competitions with Issei. As the harem forms, Naruto would have to balance his relationships with different girls. He might have deep conversations with Ravel about their different worlds and values.
The story could unfold in an interesting way. Naruto's ninja skills would be quite a novelty in the Highschool DxD world. Ravel, being a devil, would initially be curious about Naruto. The harem aspect would come into play as Naruto's kind heart and heroic deeds draw in more female characters. They would have to navigate the complex social and power structures of the DxD world. Naruto might teach them some of his ninja philosophies, and together they would create a unique dynamic within the group, facing challenges both from the devils' internal politics and external threats.
Highschool DxD has a huge fan base, and Ravel is a popular side - character. Writers can take the existing lore and expand on it. For example, they can create new storylines for Ravel in different settings, such as in an alternate universe where she has different powers or goals. This gives a lot of creative freedom, which attracts both writers and readers.
One common theme is power growth. Since Ravel is from the Phenex family, many fanfictions explore her developing her powers and how she uses them. Another theme is friendship. Ravel often forms new friendships or strengthens existing ones in these stories.
Maybe a rogue ninja from Gaara's world who somehow follows him into the DxD highschool. This ninja could have a vendetta against Gaara and use the chaos of the DxD world to try and take him down. They could also team up with some of the devils who dislike Gaara's presence to create more trouble for him.