A really cool plot might be that Akamaru discovers a secret power within himself, like the ability to transform into a giant, super - powerful beast. Naruto then has to help Akamaru control this new power so that it doesn't go out of control. Maybe they also have to face off against a group of ninjas who are after Akamaru's new power. Naruto could train Akamaru in new ninja techniques using his own knowledge and skills.
One idea could be that Naruto discovers a unique bond between a female Akamaru - like character and himself. Maybe she has some special abilities that help Naruto in a new mission. For example, she could be able to sense things that normal ninjas can't, like hidden traps or approaching enemies from a great distance. Another plot could involve the female Akamaru - like character getting lost in a dangerous forest and Naruto has to rescue her while facing various challenges along the way. Or perhaps she comes from a different clan that has a long - standing feud with the Hidden Leaf Village, but Naruto manages to bridge the gap between them through their friendship.
One possible plot could be that Naruto and Akamaru go on a mission together. Since Akamaru is Kiba's partner, maybe Kiba is injured and Naruto offers to help Akamaru complete a mission that is crucial for the village. Along the way, they face various challenges like difficult terrains and enemy ninjas. Naruto could use his shadow clones to confuse the enemies while Akamaru uses his powerful sense of smell to track down the target.
One interesting Naruto and Akamaru fanfiction could be about Akamaru getting lost in the forest during a mission and Naruto using his shadow clones to search for him. They might encounter some rare and dangerous beasts along the way, but Naruto's determination and Akamaru's loyalty would shine through in the end.
There might be a fanfiction where Akamaru gains some special abilities. For example, he could develop the ability to communicate telepathically with all the villagers in Konoha. This would make for an exciting story as he uses this new power to help Naruto and the others in various situations, like during a surprise attack on the village.
In this fanfiction, perhaps Akamaru's 'in heat' state causes some chaos in the village. Naruto then uses his ninja skills to keep Akamaru in check and prevent him from causing too much trouble. He might also seek advice from Kakashi or other experienced ninjas on how to deal with it.
A more complex plot might involve Tayuya being captured by an enemy group and Naruto being the only one who can rescue her. Along the way, Naruto discovers some secrets about Tayuya's past that change his perception of her, and she in turn realizes that Naruto is not just a simple - minded ninja as she initially thought. As they escape from the enemy, they form a bond that is both unexpected and deep.
One idea could be that Hitomi has a special power that Naruto discovers during a mission. They then have to work together to keep this power a secret from the wrong people. Another could be a story where Hitomi is from a different village and Naruto has to convince her that Konoha is a place she can trust. Maybe she has some information about a new threat and Naruto needs to protect her while getting that information.
One plot idea could be Naruto trying to understand Pain's ideology on a deeper level while in the midst of battle. Maybe he discovers some similarities between their motives, like their desire for peace in their own ways. Another could be Naruto getting trapped in one of Pain's jutsu and having to experience Pain's past traumas first - hand, which changes his perspective on him.
A more complex plot could be set in a time when there is a famine in the village. Ayame's ramen shop is struggling to get ingredients. Naruto, being the hero he is, offers to help. They travel to different lands to trade for ramen ingredients. Along the way, they encounter various characters from other villages, some friendly and some hostile. This journey not only strengthens their friendship but also helps to save the ramen shop and feed the village.
Another plot could involve Hancock falling ill in the Naruto world. Naruto, with his strong sense of helping others, tries to find a cure for her. This could lead them on a journey across different ninja villages, where they encounter various characters and learn about each other's cultures. Along the way, a romantic relationship might start to develop between them.