In fantasy novels, a badass main character is often defined by their courage. They are not afraid to step into the unknown. For instance, Lyra in 'His Dark Materials' ventures into different worlds without hesitation. Their skills also matter. A character like Legolas in 'The Lord of the Rings' has amazing archery skills that make him stand out. And their growth throughout the story is important. Frodo starts as a somewhat naive hobbit but grows into a hero. This transformation and the challenges they overcome on the way are what make them badass.
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Well, it could be characters like Draco Malfoy. In the original series, he had his moments of growth and in fanfics, he might be one of the main Slytherins to defend Hogwarts. Maybe he finally realizes the importance of the school and his own values change. He could be joined by other Slytherins who were perhaps overlooked in the official story but show their true courage in the fanfic.
Obviously, Bella is one of the main characters as it's named after her. There might also be other characters like her friends who support her in her badass adventures, or her enemies who she has to face off against. It could also include love interests, depending on the nature of the story.
Issei is the central figure in 'badass issei fanfic'. But there are other characters too. For example, the villains he faces. They are designed to test his new - found badass skills. And then there are his comrades from his group who interact with him in different ways, depending on how his badass personality affects the group dynamics.
Obviously, Bella is one of the main characters since it's about her being a badass. There might also be other characters from the original story she is from, like Edward or Jacob, who could be involved in the new storylines around badass Bella.
Well, Akko is obviously the main character in 'badass Akko fanfic'. But often, her friends like Lotte and Sucy also play important roles. They might support Akko in her badass adventures, or sometimes they even get into trouble that Akko has to bail them out of.
Frodo Baggins from 'The Lord of the Rings' is a badass in his own way. He undertakes a seemingly impossible task of destroying the One Ring, facing countless perils along the way. He has a quiet strength and an unwavering resolve. Rand al'Thor from 'The Wheel of Time' is another. He has the power to channel the One Power and is fated to either save or destroy the world. His journey is filled with battles, both internal and external, which he bravely faces.
Obviously, Naruto is the main character. He's the one who is going to transform into this badass figure. Sasuke might also play an important role. He could be Naruto's rival - turned - ally or vice versa. Their relationship always adds depth to the story.