One idea could be that Andu has a special ice - based jutsu that Naruto must learn to defeat an enemy that thrives in heat. Another could be Andu being from a hidden cold village and Naruto has to form an alliance with him to face a common threat.
Andu could be an original character created for the fanfiction. He might be a ninja with special abilities related to cold, like the ability to freeze objects instantly or create ice sculptures that can come to life.
One plot idea could be that the cold Naruto is initially distrustful of the Fem Kyuubi. But as they interact more, he starts to see her as more than just a powerful being. For example, she could help him in a battle against a common enemy, and during that time, he realizes her loyalty and they begin to form a bond.
A plot idea could be that Naruto discovers a new, ancient form of chakra that has been lost for centuries. He then has to train to master this chakra while also dealing with the political implications within the Hidden Leaf Village. Some elders might be against him exploring this new power for fear of the unknown, but Naruto, being Naruto, is determined to master it for the good of the village.
One idea could be that the events of 9/11 somehow influence the Hidden Leaf Village. For example, they might tighten security and Naruto could be part of a new team in charge of protecting the village from potential outside threats inspired by the real - world event. Another plot could involve characters from Naruto trying to understand the concept of such a large - scale tragedy and how they can prevent similar things in their own world.
One idea could be that Neji discovers a new hidden power within Naruto that he helps Naruto master. This could lead to them having to face a new, powerful enemy together.
One interesting plot idea could be a time - travel story. For example, Naruto is sent back in time to the era of the First Hokage. He could use his knowledge of future jutsu and events to change things for the better in the past. Another idea is a story where Naruto discovers a hidden clan within Konoha that has a unique and powerful Kekkei Genkai. He then has to help this clan gain acceptance in the village. A third idea might be a story where Naruto is turned into a different creature, like a cat or a fox, and has to find a way to turn back while still dealing with the normal threats to the village.
One idea could be a character seeking revenge on a former friend who betrayed them. They plan their revenge carefully, using the other person's weaknesses against them.
A great plot could involve the female Naruto being sent on a diplomatic mission to another village. There, she discovers a conspiracy against the Hidden Leaf Village and has to use her wits and ninja skills to expose it and prevent a war. Along the way, she also forms unexpected friendships with some of the villagers from the other village, which helps her in her mission.
A really interesting plot could be a tournament in which both Naruto characters and Pokegirls participate. They have to fight against each other using their respective skills. It would be a test of strategy and power, and also a great opportunity for character development as they learn from one another's fighting styles.
One idea could be that Naruto somehow gets transported to the world where Tiamat exists. He has to use his ninja skills to survive in a completely different and magical realm. Maybe he teams up with local heroes to face a threat that Tiamat also has an interest in.