Sasuke could be a suitable character. Given his dark and brooding nature, and his already strong skills with a blade. The Executioner's Blade could enhance his already formidable abilities and give him an edge in battles.
A young orphan with no known ninja heritage could be a great new character. This character stumbles upon the Executioner's Blade and discovers they have an innate ability to use it. Despite lacking formal training, they have a strong will and sense of justice, which drives them to learn how to control the blade's power and become a hero in the Naruto world.
It could be Naruto if he manages to master a blade that enhances his already strong abilities. His chakra reserve is huge, and with a blade that multiplies his power, he would be extremely formidable.
There could also be a storyline where the Executioner's Blade has a curse. The wielder starts to be influenced by dark thoughts and desires. As the character battles against this curse, they also have to deal with the external threats from other ninjas who see the change in them and believe they are a danger. This could lead to a complex story of redemption and self - discovery.
Well, if Naruto were to wield the Executioner's Blade in a fanfic, it could open up a whole new world of fan art. Imagine the cool drawings of Naruto with this big, menacing blade in his hand. Story - wise, it could also attract new villains who are interested in the blade or are afraid of what Naruto can do with it. This could create a series of intense battles and power struggles within the fanfic's narrative.
A shy artist could be an interesting character. They could use the Peacock Miraculous' power to create beautiful yet powerful constructs. Since they're shy, they might initially be afraid to use it in public, but as they gain confidence, they become a force to be reckoned with. Their artistic side could also influence the way the akumas or amoks they create look, adding a unique aesthetic to the story.
Another interesting plot would be if the Executioner's Blade had a mind of its own. It could choose its wielder, and Naruto has to prove himself worthy to it. This could lead to a journey of self - discovery for Naruto as he tries to understand what the blade wants from him and how he can use it for good.
Kakashi could be another option. He is a highly experienced and intelligent ninja. If he came across the skull mask, he would approach it with caution. He might study it first to understand its origin and power before deciding whether or not to use it. His calm and collected nature would be a great contrast to the potentially wild power of the mask.
He would likely become a more formidable opponent. The Executioner's Blade is a powerful weapon, and Naruto's already impressive skills combined with it would make him a force to be reckoned with.
In many fanfictions, dual - wielding makes Naruto seem more confident. He has to learn new combat skills and this gives him a sense of accomplishment. For example, if he dual - wields swords, he has to be more precise and calculated in his attacks, which changes his usually impulsive nature.
It's likely that Naruto himself would be one of the most powerful. His ability to use chakra and his various jutsu like the Rasengan would give him an edge in combat. He also has the Nine - Tails' power which could be a game - changer.