The plot is super important. It could be a story about the OC and Serafal teaming up to face a new threat in the Highschool DxD universe. Or perhaps a romantic storyline that develops in a believable way. If the fanfiction can blend the existing lore of Highschool DxD with new and exciting elements involving the OC and Serafal, it has a good chance of being great. For instance, if they go on an adventure to a new and mysterious place in the DxD world.
A great one often has a well - developed OC. The character should have a distinct personality, backstory, and goals. For example, if the OC has a unique power or a tragic past that ties into the story, it can make the fanfiction more interesting. Also, a good portrayal of Serafal is key. Keeping her character traits like her bubbly yet powerful nature intact.
Good writing style also matters a great deal. If the author can write engaging dialogue between the OC and Serafal, it can bring the story to life. And the descriptions of the scenes, whether it's a battle or a romantic moment, should be vivid. A great fanfiction in this category should be able to make the reader feel like they are part of the Highschool DxD world, experiencing the story along with the OC and Serafal.
Chapter 646, "This person deserves a slap in the face!", is the clearest early answer because it turns Jiang Li's situation into a concrete plot event. A useful checkpoint is the way the scene starts with Jiang Yan: "....." Bloody green tea, get lost!
Chapter 18 is the strongest chapter-level answer because it starts from In the corner, a girl in a black dress sat quietly, holding a glass of... and follows through on Hurry home, what is a young lady like you doing running to a place like....
The best chapter pointer here is Chapter 10, "All for Wiping Your Butt". It opens with Qiao's shocked face struggle to recover, Lin Manru also tasted for the... and closes on Who was it again saying that the Jiang Family's tradition was lacking,....
If you want the clearest chapter reference, go to Chapter 23. Early on, Although Jiang Li exerted very little strength, Jiang Yan instantly felt...; later, the chapter leans on The pain twisted his face grotesquely as he dove headfirst into the sofa..
A practical answer is Chapter 11, because it turns the idea into a concrete scene. The chapter opens with After a meeting, Shang Shaojing pinched the bridge of his nose, tired, and..., adds pressure through Qin, could you pour me a cup of tea as well?, and ends on Miss Qin, please accompany us to.
If you want the clearest chapter reference, go to Chapter 34. Early on, Seeing that the public sentiment wasn't quite right, Su Yinwan felt...; later, the chapter leans on It was she who had anonymously paid someone to write the critical article....
Chapter 765, "Dead Early in the Morning!", is the clearest early answer because the violence around Su Yinwan becomes final instead of hypothetical. The chapter gives readers a real answer by opening on Jiang Li offered a gentle smile, her expression unchanging.
The best chapter pointer here is Chapter 17, "Madam, the eldest young master has disappeared again". It opens with Jiang Li glanced at Jiang Shixu, who was tense and anxious behind her, and... and closes on I've been a mother for more than ten years but never tasted anything made....