One idea could be that Naruto discovers a hidden dragon summoning scroll. He tries to master the summoning technique, but the dragons are very powerful and difficult to control at first. Another plot could involve a dragon that has a special connection to Naruto's family history. Maybe his mother or father had a pact with the dragons long ago.
A cool plot might be where Naruto is in a desperate battle and he summons a dragon for the first time. The dragon is not like the normal summons. It has unique abilities like breathing a special type of energy that can heal as well as harm. This dragon could then help Naruto in his fight against a powerful enemy, and along the way, Naruto has to learn to communicate with it effectively.
One idea could be that Naruto's dragon summon is a powerful and ancient being. It could help Naruto in battles against extremely strong foes like Madara or Kaguya. For example, the dragon might have unique abilities like breathing fire that can melt through powerful jutsu defenses. Another plot idea is that the dragon has a connection to Naruto's Uzumaki heritage, perhaps it was once an ally of the Uzumaki clan long ago. And the dragon could also teach Naruto new and powerful techniques that are related to dragon - like chakra control or flying abilities, which would give Naruto an edge in his ninja adventures.
Maybe the chameleon is from a long - lost clan of summon animals that were thought to be extinct. And it holds the key to a powerful jutsu that was lost in time. Naruto discovers this when he first summons the chameleon and has to go on a journey to unlock the jutsu's potential.
One idea could be a story where Naruto discovers a new type of frog summon that has a unique ability, like the power to control water in a way no other frog can. This could lead to him facing new challenges and enemies. Another plot could involve Naruto's frog summons going on a mission without him, and he has to find a way to communicate and guide them from afar. Maybe they encounter a powerful enemy in the frog realm that they need Naruto's help to defeat.
One idea could be a human summon from a long - lost clan with unique powers. For example, a summon from a clan that can control time in small increments. This human summon could be an ally to Naruto in a difficult battle against a new, powerful enemy.
Perhaps the Knights of the Round are summoned by accident when Naruto is trying out a new experimental jutsu. They initially misunderstand their purpose in this new world and cause some chaos. But as they learn about Naruto's world and his cause, they decide to help him in his fight against the Akatsuki. They could offer strategic advice based on their own experiences in their home realm.
One idea could be that Naruto, as a dragon, has to protect the Hidden Leaf Village from a new threat that is specifically targeting dragons. He could use his dragon abilities like flight and powerful breath attacks to fend off enemies.
One idea could be that Naruto summons a special fox with unique powers that helps him defeat a powerful enemy in a new and unexpected way. For example, the fox might have the ability to create illusions so strong that they can mislead even the most powerful ninjas. Another plot could involve Naruto using the summoned foxes to explore a hidden part of the ninja world that was previously inaccessible. Maybe the foxes know the secrets of an ancient ruin and lead Naruto there, where he discovers new jutsus or artifacts.
Perhaps the bat summon is from a cursed place, and when summoned, it brings a dark influence. The Naruto characters then have to find a way to break the curse on the bat and its place of origin. This could involve a journey to discover the history of the bat summon and the secrets of the place it comes from. It would be a story full of mystery and danger.
Perhaps in the fanfiction, the leviathan is a sentient being from a different dimension. Naruto forms a bond with it not just as a summon but as a friend. They communicate telepathically, and the leviathan helps Naruto understand some of the deeper secrets of chakra by showing him how it manipulates energy in its own dimension.
Maybe the Cerberus in the fanfiction has a special connection to the Nine - Tailed Fox. It could be that they are both from an ancient and powerful lineage. The Cerberus could be a guardian of some sort, and its summoning requires the main character to prove their worthiness, perhaps by passing a series of trials in a mysterious realm.