Perhaps in the fanfic, the hypnosis bloodline allows the user to enter people's minds and change their memories. The story could be about a character who uses this ability to rewrite the past of a village that has been corrupted by an evil force. However, they soon realize that changing memories has unforeseen consequences and they have to find a way to fix the mess they've created.
One interesting plot idea could be a villain using hypnosis to turn Naruto's friends against him. This would create a lot of internal conflict for Naruto as he has to figure out how to break the hypnosis and regain their trust.
One idea could be a story where the main character discovers their Furyan bloodline late in their ninja training. This newfound power could cause conflict with their village at first as they struggle to control it. Then, they go on a journey to learn about their bloodline's origin and meet other characters with similar powers.
One interesting plot could be the discovery of an ancient prophecy that states a person with a specific Zanpakuto bloodline will be the key to saving the Naruto world from an impending doom. This person is initially unaware of their bloodline and must go on a journey of self - discovery. As they do, they learn about the power of their Zanpakuto and how it relates to their bloodline. They face numerous challenges, including battles with other powerful ninjas who want to use the prophecy for their own gain.
One idea could be a character with a devil bloodline being initially shunned in the Hidden Leaf Village but then proving their worth in a major battle. For example, they could use their unique devil - like abilities, such as enhanced speed and strength, to turn the tide against a powerful enemy.
Perhaps a 'pokemon hypnosis fanfic' could involve a group of pokemon researchers who accidentally discover a form of hypnosis that can communicate with pokemon on a deeper level. They use this to learn more about pokemon behavior and intelligence. However, some unethical individuals try to use this for their own gain, leading to a conflict.
Well, you could create a fanfic around a bloodline limit that combines elements of different existing ones. Say, mixing the Sharingan's ability to copy techniques with the Byakugan's long - range vision. This new bloodline limit could give the wielder an almost unbeatable advantage in battle. Also, a bloodline limit that gives the power to manipulate the elements in ways not seen before, like creating hybrid elements easily.
A really interesting plot could be that the Kyuubi bloodline in Naruto starts to have an effect on his relationships. Some people in the village might be afraid of him now that they know he has this powerful bloodline. On the other hand, some might see him as an even greater asset. Naruto then has to deal with the social implications while also training to control the new powers that come with his Kyuubi bloodline. He could also find out that there are other ninja out there with a similar bloodline from other tailed beasts, and they come together to form a unique group.
One plot idea could be that Naruto discovers a hidden hypnosis jutsu and accidentally uses it on Haku. Haku then starts to see memories from Naruto's past and it changes their relationship dynamic. They could then team up to face some new threats in the ninja world.
In a fanfiction, you could have a scenario where an enemy uses a dark form of Bakuton bloodline power. Naruto and his comrades must find a way to counter it. They seek out an old hermit who has some knowledge of the Bakuton bloodline's weaknesses. Along the way, they learn more about the bloodline's connection to other elemental powers in the Naruto world, and how it can be used for both destruction and creation.
One idea could be a story where a character with the Shikotsumyaku bloodline discovers a new and powerful bone - related ability that no one in their clan has ever had before. This could lead to them being both feared and respected within the Naruto universe.