What are the potential drawbacks of Naruto having the ability to control blood in fanfiction?

A possible drawback is that it might require a great deal of concentration. Naruto is already dealing with a lot in combat, like using his various jutsu and strategizing. Adding blood control to the mix might overtax his mental resources, making him vulnerable to attacks. Also, if his enemies figure out his new ability, they could try to counter it by using techniques that disrupt blood - related manipulation, like creating strong chakra fields around their bodies to prevent him from accessing their blood.

One consequence could be that he loses the trust of his friends. They might be afraid that he could control them at any time.

It could be a result of some new form of chakra manipulation. Maybe he discovers a way to combine wind and earth chakra in a unique way to create and control smoke.

He might attract the wrong kind of attention. Evil ninja or dark organizations could see him as a valuable asset or a threat. They might try to either recruit him or eliminate him. This would put Naruto in a lot of dangerous situations, constantly having to defend himself against these new enemies.

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.

One potential drawback is that it can be confusing for the reader. With so many different settings, it becomes hard to keep track of where each scene is taking place. It may also make the story feel disjointed as the characters are constantly moving from one place to another. Another issue is that it can overshadow the characters and the plot. The focus might shift from the story's core elements to just describing the various settings.

One drawback could be that it might disrupt the balance of powers in the Naruto world. Naruto was already a powerful ninja, and adding Sans' powers could make him overpowered compared to others, which might make the story less interesting as there would be less of a challenge for him.

Well, the main drawback is the damage to his body. The Eight Gates technique is very taxing on the body. Naruto could end up with permanent damage if he uses it too often. Also, it might change his personality. The intense power of the Eight Gates might make him more aggressive, which could be a problem when dealing with his friends and allies. And from a strategic point of view, if he uses it too early in a fight, he could exhaust himself and be vulnerable to counter - attacks.

His body might not be fully adapted to the new bloodline right away. Just like when he first started using the Nine - Tails' chakra, there could be side effects. His chakra control could be thrown off, or he could experience physical pain when trying to use the new bloodline - related abilities until he fully masters it.

The drawbacks could be significant. He may start to isolate himself because he knows things that others don't. This could lead to a breakdown in his relationships. And if the wrong people found out about his ability, they would surely try to use it for their own evil purposes. He would constantly have to be on guard against that. Another issue is that the future he sees might not be set in stone. If he made decisions based on what he saw, but then the future changed, it could lead to chaos.