Perhaps an evil ice mage from the Frozen world who has heard of Naruto's power and wants to steal his chakra to become all - powerful. This mage could be jealous of Elsa's natural ice powers and sees Naruto as a means to an end to get rid of her as well.
In a 'naruto x elsa frozen fanfic', it could start with Naruto being lost and finding himself in Arendelle. Elsa senses his strange energy. At first, there is conflict as the people of Arendelle are scared of Naruto. But Naruto shows his good heart. Elsa and Naruto then start to explore each other's worlds in a spiritual sense. They find similarities in their isolation. As they bond, a new enemy emerges, a sorcerer who wants to control both Naruto's ninjutsu and Elsa's ice magic. Together, they fight against this threat, with Naruto's courage and Elsa's grace.
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.
Mainly it's Elsa, the strong - willed and magical queen from the Frozen world, and Idun, the Norse goddess. Elsa has her own story of isolation and growth, which would contrast and interact with Idun's more ancient and powerful nature. Their relationship, whether it's one of mentorship, friendship, or something more, would be at the heart of the fanfic. The fanfic could explore how their different backgrounds, Elsa from a more modern - ish fairy - tale world and Idun from Norse mythology, shape their interactions.
Their relationship can be developed through shared experiences. For instance, they could go on a journey together to explore a new part of their kingdom. During this journey, they would face challenges like difficult terrains or wild animals. As they overcome these challenges side by side, their trust in each other would grow. They could also have heart - to - heart conversations at night, under the stars, where they open up about their fears and hopes.
It could be a character who has the power to absorb chakra and ice magic. Let's call him Zarak. Zarak wants to use the combined power of Naruto's world and Elsa's world to become invincible. He starts by causing chaos in both worlds, making the Hidden Leaf Village believe that Elsa is a threat and making Elsa think that Naruto and his friends are there to capture her. This way, he can keep them apart and continue his evil plan.
There are fanfics that might focus on a pre - story scenario where Elsa's mother was still alive. In these, the relationship between them could be depicted as very nurturing. For example, her mother could be teaching Elsa how to control her powers at a young age in a way that the movie didn't show. This can add new layers to Elsa's character development and her journey with her powers.
One possibility could be a story where Elsa discovers the world of Idun. Their kiss might symbolize a union of two different magical realms. Maybe Elsa is on a quest to save her own world and Idun's realm holds the key. The kiss could be a moment of connection that unlocks new powers within Elsa.
Well, a plot could involve Elsa feeling lost and out of place in her own world. She then stumbles upon Idun by accident. Idun, being the goddess of youth and rejuvenation, sees potential in Elsa's powers. They start to exchange knowledge about their respective powers. As they do so, they notice that there are dark forces that are envious of their combined might and try to separate them. So, they must fight to stay together and protect their new - found bond.
One popular 'Frozen Elsa x Anna fanfic' might be those that explore their sisterly bond in new and exciting ways. For example, a fanfic could be about them going on a secret adventure together in the Enchanted Forest, facing new magical creatures and learning more about their family's past. This type of story can be really engaging as it delves deeper into the world of 'Frozen' and the relationship between the two sisters.