In a Naruto barbarian fanfiction, perhaps Naruto discovers a hidden tribe of barbarians who have a special connection to chakra. He tries to understand their way of using chakra which is very different from what he knows. This could lead to him having to adapt and find new ways to use his own chakra, all while building relationships with the barbarians.
One good 'barbarian Naruto fanfiction' could be one where Naruto is thrust into a barbarian - like land and has to adapt his ninja skills. For example, he might use his shadow clone jutsu in creative ways to hunt for food or defend against the wild beasts in this new and savage environment.
Well, it could imply that the fanfiction portrays Naruto in a very rough or uncivilized way. Maybe in this fanfic, Naruto's character is given traits that are more savage or brute - like compared to his original character in the official Naruto series.
One idea could be a crossover with 'The Lord of the Rings'. Conan could find himself in Middle - earth, perhaps teaming up with Aragorn. They could share their combat skills and Conan's brute strength would be an asset in battles against Sauron's forces. Another could be a crossover with 'Game of Thrones'. Conan might get involved in the power struggles in Westeros, using his swordsmanship and survival instincts to navigate the complex political and violent landscape.
Another concept could be a Hogwarts student who is bullied and decides to embrace the ways of the barbarian in secret. They train in combat and develop a more fearless attitude. Eventually, they use their new skills to stand up to their bullies and also help their friends in dangerous situations, like during a wizarding tournament.
I don't think it's a popular concept. Naruto has a well - established image in the anime and manga world. The idea of him being a 'barbarian' in fanfiction is quite a deviation from the norm. Fans usually enjoy fanfictions that expand on the original story's themes and characters in a more in - line way, rather than completely changing Naruto into a 'barbarian' which might seem too extreme for many.
One 'barbarian war story' could be about a small tribe of barbarians who managed to hold off a much larger and better - equipped army. The barbarians used the rough terrain to their advantage, setting up traps in the mountains and forests. They would ambush the enemy soldiers, using their primitive but effective weapons like axes and spears. Their fierce and unyielding fighting spirit made them a formidable force, and in the end, they forced the larger army to retreat.
One interesting Naruto fanfiction could be those that explore an alternate universe where Naruto becomes a villain. It flips the whole story on its head and shows a different side of the characters. Another type is the ones that focus on Naruto's relationships in a more in - depth way, like his friendship with Sasuke evolving in unexpected ways.
One interesting Naruto fanfiction could be about Naruto learning a new and extremely powerful jutsu from an ancient scroll he discovers. This jutsu gives him an edge in battles against powerful foes like Madara. Another could be a story where Naruto travels to a different dimension and has to team up with alternate versions of his friends to save both worlds.
One interesting Naruto fanfiction could be about Naruto having a secret power that he discovers during a mission in a hidden land. This power could change the way he approaches battles and his relationships with his friends.
Some fanfictions in 2017 could focus on Naruto's family life. For example, how he is raising his children and passing on his skills and values. It could show a more domestic side of the great hero.