Perhaps in this fanfiction, Naruto as Elsa's son is sent to the Naruto universe from the Frozen world for some important reason. He has to adapt to the new environment where there is no snow all the time. He uses his ice powers in a unique way during battles, for example, creating ice clones instead of the regular shadow clones. His connection to Elsa could also give him some sort of mental link to her, and she might offer him advice on controlling his powers through this link.
One possible plot could be that Naruto, being Elsa's son, discovers his ice powers at a young age in the Hidden Leaf Village. He might struggle to control them at first, just like Elsa did. His friends in the village could be both curious and a bit scared of his powers. Naruto would then have to learn to balance his ninja training with understanding and mastering his ice abilities, all while trying to keep his identity as Elsa's son a secret from potential enemies who might want to use his unique powers for their own gain.
Well, one possibility could be that Harry has Elsa's powers in addition to his wizarding abilities. He might use his ice powers to combat the dark forces at Hogwarts. For example, he could freeze the dementors instead of using a Patronus. Another aspect could be his relationship with the other characters. Maybe Hermione would be fascinated by his new powers and try to study them scientifically, while Ron might be a bit jealous at first but then come to see how useful they are in their adventures.
One possible plot could be that Naruto, while on a strange mission, gets transported to Elsa's world. Naruto, being his adventurous self, tries to understand Elsa's powers and her fear of them. He might encourage her to face her fears in a more direct way, like he does with his own challenges in the ninja world. And they could team up to protect Elsa's kingdom from some unknown threat.
A possible plot might be that there is a prophecy in both the Naruto universe and the Frozen universe. It says that a union between a powerful shinobi and an ice queen will save both worlds from a great darkness. Naruto and Elsa are brought together by this prophecy. At first, they struggle to understand each other's cultures and powers. However, as they spend more time together, they develop a deep bond. They use their combined powers of ninjutsu and ice magic to fight against the approaching darkness that threatens to engulf their respective worlds.
One possible plot could be that Hermione, being a brilliant witch, discovers a magical portal that leads her to the world of Arendelle. There, she meets Elsa and is immediately intrigued by Elsa's ice powers. She decides to study them from a magical perspective. Along the way, they become friends and Hermione helps Elsa better understand and control her powers using her knowledge of magic and spells.
In a 'naruto son of bellatrix fanfiction', perhaps Naruto has some of Bellatrix's wild and unpredictable nature. He could be on a journey to discover his true identity and how he came to be Bellatrix's son. This might lead him to explore the secrets of the wizarding world and his own ninja abilities in a new light.
Well, one possibility could be that Naruto inherits some of Gilgamesh's arrogance along with his power. Maybe he has a special ability to summon ancient Babylonian weapons. And he could use this in his battles in the Naruto world, like against the Akatsuki.
One possible plot could be that Naruto discovers his true heritage as the son of a princess from a hidden kingdom. He then has to deal with the politics and expectations of the royal family while still maintaining his ninja ways. Maybe he has to protect the kingdom from a new threat using his ninja skills.
In such a fanfiction, perhaps Naruto could be shunned by the village from the start. His 'devil' heritage might give him strange powers that he has to hide. He could struggle with self - identity, different from the Naruto in the original who is seen as a hero. Maybe he has to fight against the prejudice of the people who believe the devil's son can only bring destruction.
Well, it could be about Naruto having powers related to Hades on top of his ninja skills. Maybe he can control the dead or has some sort of underworld - like abilities that he uses in battles against the Akatsuki. He might also have to deal with the stigma of being the son of Hades in a world that doesn't understand such a thing.
Maybe Naruto is raised in Gotham instead of Konoha. He could inherit some of Catwoman's skills like stealth and agility, while still having his own ninja powers. He might fight crime in Gotham using a mix of his ninja techniques and Catwoman - like thievery skills, but for good causes.