Key elements to include: defining the saga's premise, the protagonist's journey, the brother's role, conflict resolution. Also, how the saga explores deeper issues like identity, family trauma, or moral ambiguity. Maybe compare it to other works with similar anti-hero themes.

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.

I should check if there are existing works on similar topics to reference, but since the user is suggesting a fictional saga, it's likely original. Therefore, the paper can be more speculative, analyzing the narrative elements as if critiquing a published work.

I need to make sure the paper is coherent, with clear sections. Perhaps start with an abstract summarizing the main points. Then discuss the narrative structure, character dynamics, themes, and the saga's impact. Conclude with the implications of the story's message.