Well, having all the summoning contracts might also be a burden. He has to manage and keep good relations with all the different summon clans. If he fails to do so, he could lose their support. Also, it might be overwhelming to keep track of all the different summons' abilities and needs.
Naruto having all the summoning contracts would mean he has access to a vast array of resources. He could use the unique abilities of different summons to gain an edge in battles. For instance, if he needed to cross a large body of water quickly, he could summon a water - based creature. And in combat, he could combine the attacks of different summons to create powerful and unexpected strategies, which would greatly alter the power dynamics in the story.
One could be a fanfiction where Naruto discovers he has the ability to summon not just toads but also other powerful creatures like wolves from a hidden contract. This new power gives him an edge in battles and changes the way his enemies view him.
A great one is 'Naruto: The Multi - Summoner'. In this fanfiction, Naruto unlocks the secrets of multiple summoning contracts one by one. It starts with his toad contract and then he discovers a contract with elemental spirits that help him control different types of nature chakra more effectively.
One potential drawback could be the moral implications. Controlling someone else's blood is a very invasive and potentially cruel ability. Naruto, who is known for his kind heart, might struggle with using such a power. Also, it might be difficult to control precisely, and he could accidentally harm allies if he's not careful.
One possible contract Demon Naruto could make in fanfiction is with a powerful spirit. This could grant him unique abilities like enhanced speed or the power to manipulate shadows. It would be an interesting plot point as he'd have to figure out how to use these new powers while still maintaining his own identity.
The crows in the summoning contract could provide Naruto with unique transportation options in fanfiction. They could carry him quickly over long distances, which would be useful for getting to different battlefields or missions in a hurry. Additionally, the crows might have some sort of connection to the spirit world or possess special knowledge that Naruto could access. This would open up new story arcs where Naruto delves deeper into the mysteries of the Naruto universe through his connection with the crows.
One consequence could be that he loses the trust of his friends and village. Zombies are often associated with evil and death, so people might be scared of him.
One implication could be that he becomes an extremely powerful ninja, far more powerful than in the original series. With the three doujutsu, he can have enhanced perception, powerful genjutsu abilities, and unique ways of attacking and defending.
One drawback could be the strain on his body. The Sharingan is a powerful dojutsu, and Naruto's body, which is used to his own chakra system, might not be able to handle it well at first. This could lead to fatigue and over - exertion during battles.
One interesting Naruto makes contracts fanfiction could be about him making a contract with a unique and powerful spirit. For example, a spirit from a long - forgotten realm that gives him special abilities like the power to manipulate time on a small scale during battles. This would add a whole new dimension to his combat skills and make for an exciting read.