I should also consider the audience. If it's for academic purposes, references to literary theory might be useful. Maybe mention Joseph Campbell's monomyth for the hero's journey, or discuss the anti-hero archetype. However, since it's a fictional saga, keeping the analysis grounded in the story's context is crucial.
Possible challenges include ensuring that the paper stays focused and doesn't become too generic. To overcome this, I should emphasize unique aspects of the "bad brother" in this particular saga compared to similar tropes in other media. Maybe the brother's transformation arc or the moral dilemmas faced by the protagonist.
Wait, the user might be looking for a creative writing approach rather than an analytical one. The prompt says "come up with a paper," but it's possible they want an example of what such a paper might look like. So, structuring it with an abstract, introduction, sections on themes and analysis, and a conclusion would make sense.
Potential themes: The duality of good and evil within a single character, the struggle for redemption, the impact of past trauma on present actions. The brother's "bad" traits could be a result of his upbringing, societal influences, or personal trauma. The saga might explore how the protagonist deals with this complex relationship, seeking to understand or change the brother.