It could be a fan - made story that combines the Naruto universe with the concepts of harem (where one character is surrounded by multiple love interests), heaven (maybe a positive or ideal setting), and yandere (a character type that is overly possessive and often violent in love). However, without reading it, it's hard to say precisely.
Popular themes in this type of fanfiction might include the protection of the main character by the harem members. Given Naruto's world of battles and danger, the harem could be seen as a source of support. The yandere theme can introduce the idea of over - protection, which sometimes turns into a form of control. Another theme could be the discovery of true love within the chaos of the harem and the yandere - induced problems. It's about how the characters navigate through this complex setup of relationships, with the added spice of the Naruto - related elements like ninjutsu and the ninja world's values.
A different concept could be that a yandere curse is placed on Naruto, and as a result, any girl who gets close to him starts to develop yandere traits towards him. This could lead to a really chaotic harem situation where the girls are constantly fighting over Naruto, and Naruto has to figure out how to break the curse while dealing with their over - the - top affections.
In Naruto fanfiction related to Hell, one rule could be that the powers and abilities of characters are often adjusted to fit the Hellish environment. For example, a character might gain the ability to withstand extreme heat or manipulate demonic energy.
The 'heaven and hell naruto fanfic' often plays with the idea of morality and redemption. Naruto, being a character with a strong sense of justice, might face moral dilemmas in these extreme environments. He could encounter situations where his normal beliefs are challenged, like in hell, he has to make deals with demons to save his friends. And in heaven, he might have to prove his worthiness in a different way than he does in the normal Naruto world. This exploration of different values and growth makes these fanfics quite interesting.
One popular trope is the overprotective yandere. In yandere harem fanfiction, this character is extremely possessive of the main character and will go to great lengths to keep others away. Another trope is the rivalry among the harem members. They often compete for the main character's attention, which can lead to some intense and dramatic scenes. Also, the 'damsel in distress' scenario where the main character is constantly in need of protection from the yandere or other threats is quite common.
The plot could involve Ino's yandere tendencies causing trouble within the Hidden Leaf Village. Maybe she uses her mind - transfer jutsu in a more devious way to keep tabs on Naruto. She could even manipulate situations to make Naruto rely more on her, like making him think he's in danger when he's really not, just so she can come to his rescue and prove her 'worth' to him.
One possible plot could be that Mikoto, in her yandere state, becomes obsessed with Naruto. She might try to keep him away from his friends and training, believing that only she can protect him. For example, she could use her Sharingan abilities to spy on Naruto's interactions with others like Sasuke or Sakura, and then interfere when she feels Naruto is getting too close to them.
Naruto might be really confused at first. He's used to people being friendly or having normal crushes, but a yandere is a whole different level. He'd probably try to talk to her and understand why she's acting so strangely.
It might be that in this fanfiction, Naruto's journey to become the ruler of hell is a result of a quest for power that goes wrong. He could be trying to protect his village or friends, and in the process, he makes a deal with some underworld forces. Once in hell, he has to face all kinds of demonic challenges and also deal with his own inner demons as he rules over the place.
There's 'Percy and His Harem of Devotion'. It shows how Percy's yandere tendencies create a complex dynamic within the harem. Each character in the harem has their own unique relationship with Percy, and the fanfiction explores how they all interact in the face of Percy's overbearing love.