Well, in this 'naruto raised in hell fanfiction', it could be that Naruto was sent to Hell by some dark force or accident. There, he might learn some unique and dark jutsu from the environment or the creatures in Hell. And he may use these new powers when he eventually returns to the normal ninja world. He would also have to deal with his own inner demons while in Hell.
There could be a powerful overlord in Hell who rules the place. Naruto's presence and his potential to grow strong might be seen as a threat to this overlord's power. So, this overlord would be one of the main antagonists, constantly sending minions or directly confronting Naruto to keep him in check.
One possible plotline could be Harry learning dark magic in Hell but then using it for good in the wizarding world. For example, he might master a powerful spell that can only be learned in Hell to defeat Voldemort once and for all.
One possible scenario in this fanfiction could be that Naruto grows up with a more balanced upbringing. Tsunade might teach him medical ninjutsu and how to control his emotions better. Jiraiya, on the other hand, would surely train him in powerful combat techniques and in the ways of the sage. Naruto would probably be more mature and well - rounded at an earlier age, with a combination of Tsunade's tough love and Jiraiya's adventurous spirit guiding him.
One possible scenario in this fanfiction could be that Naruto grows up with the Namikaze Clan's unique jutsu training methods. He might inherit some of Minato's (a Namikaze) speed and intelligence in combat at a much earlier age. This could lead to him being a more confident and skilled ninja from the start, as the Namikaze Clan has a reputation for their strong abilities.
One interesting Naruto and Hell Girl fanfiction could be where Naruto somehow ends up in the world of Hell Girl. Maybe he meets Ai Enma and tries to convince her to use her powers for good in a different way. There could be a plot where Naruto's positive energy starts to influence the dark world of Hell Girl.
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.
In a Naruto - raised - Jedi - and - Sith fanfiction, Naruto would bring his unique perspective. His own experiences of being an outcast and then a hero in his world could shape how he raises these Star Wars characters. He might introduce the concept of teamwork like in his ninja teams to the Jedi, who already have a sense of community. With the Sith, he'd be faced with a huge challenge as the Sith ideology is based on self - gain and power - hunger. Naruto could use his own story of facing powerful enemies and not succumbing to evil to try and steer the young Sith away from the dark path.
In this fanfiction, Lulu is likely a character who has the task of raising Naruto. She could be from a different realm or have a very different background from the Naruto universe. Maybe she's a sorceress or a wise woman with her own secrets and powers that she imparts to Naruto as he grows up.