In fanfiction, the seal on Naruto's heart could imply a hidden power source. It might be something that restricts his abilities until he unlocks it, adding an element of mystery and potential for growth. For example, it could be a seal placed by an ancient clan to protect a powerful chakra reserve that only Naruto can access when he overcomes certain trials.
In terms of his romantic relationships, if a love interest discovers the seal on his heart, it could either draw them closer or create distance. If they are understanding and want to help, it could strengthen their bond. But if they are afraid of the unknown associated with the seal, they might pull away. For example, Hinata might be initially scared but then resolve to stand by Naruto and help him understand the seal.
Neji might gain a significant boost in power. Without the seal suppressing him, his chakra flow could become more natural and stronger. He could potentially unlock new abilities or improve his existing ones, like his Gentle Fist technique becoming even more potent.
Well, in fanfiction, this 'Naruto has strength of a hundred seal' could be a really cool concept. It might imply that Naruto has mastered a hundred different sealing techniques or has a special seal within him that gives him extraordinary strength. This could lead to all sorts of interesting plot developments, like him being able to defeat much stronger enemies or unlock new abilities that were previously unknown in the Naruto universe.
Well, it could be that Hinata says something really cruel to Naruto by mistake. For example, she might tell him that she was only being nice to him all along because she pitied him. Naruto, who has always valued her kindness and what he thought was her love, would be devastated. His whole world view of their relationship would shatter, and his heart would break into pieces.
It could be for strategic reasons. In the world of ninjas, showing too much emotion can be a weakness. Naruto might think that by sealing his emotions, he can become a more effective ninja and better protect his village.
Self - reflection is key. If Naruto takes the time to really look at himself and understand why he closed his heart in the first place, he can start to work through those issues. Maybe he realizes that closing his heart is only causing him more pain in the long run and that by being open, he can experience the full range of human emotions again, both the good and the bad.
Perhaps after facing too much betrayal from the village he loves. If the villagers turned on him despite all his efforts to protect them, it might lead him to close his heart in self - defense, not wanting to be hurt again. He's always tried so hard to gain their acceptance and if that was all for naught, it would be a huge blow.
I don't think it's a common type. Most Naruto fanfictions tend to build on his existing character traits like his loyalty, his drive to protect his friends and village. A 'naruto has no heart' concept goes against the core of his character that fans usually love, so it's probably not a common genre in the Naruto fanfiction community.
Well, having a heart disease would likely make Naruto more cautious. He might not be as impulsive in battles or training, as he has to think about his health. This could lead to him developing more strategic thinking rather than relying solely on his brute strength.