Well, in 'Code Geass Lost Stories Fanfic', a cool concept might be the exploration of different relationships. Like, Suzaku and Lelouch could have a more cooperative relationship from the start. Also, the fanfic might introduce new areas or kingdoms within the Code Geass universe. It could expand on the political and cultural aspects of these new places, adding more depth to the world - building.
One interesting concept could be alternate endings for the characters. Maybe in the fanfic, Lelouch has a different fate than in the original series, like instead of his sacrificial end, he manages to find a way to rule Britannia without all the bloodshed. Another concept could be new Geass powers. For example, a character might develop a Geass that can control technology rather than just people.
The best chapter pointer here is Chapter 39, "Is This Book an Out-of-Print Buddhist Scripture?!". It opens with Qi Tianyu had been looking forward to watching Jiang Li's drama unfold. and closes on His original intention was just to make Jiang Li back off gracefully,....
Look to Chapter 42 for the clearest answer. It begins with You've all met now, so this game is very simple," Director Sun said., keeps building through That is, give each of the other five people in the room a score based on..., and lands on As the plane hadn't taken off yet, and the live camera.
A practical answer is Chapter 26, because it turns the idea into a concrete scene. The chapter opens with Shen Lan was bent over processing a large stack of press briefs on her..., adds pressure through One might ask, looking across the entire entertainment industry, which..., and ends on If you.
Chapter 920, "College Entrance Exam Results Inquiry", is the clearest early answer because it turns Jiang Li's situation into a concrete plot event. It opens with Outside the nursing home, Meng WanZhi anxiously waited in the car for...
A practical answer is Chapter 36, because it turns the idea into a concrete scene. The chapter opens with But soon, people began to question the authenticity of Jiang Li's bare..., adds pressure through Qi Tianyu, catching the signal, instantly turned to the duo upon entering..., and ends on After.
Look to Chapter 28 for the clearest answer. It begins with The next evening, Jiang Yan drove home seething with rage., keeps building through Before he even entered the dining room, he shouted angrily, "Lili, you did..., and lands on Lili then kicked his knee hard..
Chapter 35 is the strongest chapter-level answer because it starts from Shining Transformation Trip's filming location was set on the distant... and follows through on Brother is really hardworking, actually arriving at the same time as the....
If you want the clearest chapter reference, go to Chapter 26. Early on, Shen Lan was bent over processing a large stack of press briefs on her...; later, the chapter leans on She was nearly forty years old, but because she took good care of herself....
A practical answer is Chapter 43, because it turns the idea into a concrete scene. The chapter opens with The moment He Yun willingly sat next to Jiang Li and even took off his..., adds pressure through VIP lounges and business class still count as transformation?, and ends on Just as she turned.
A practical answer is Chapter 1, because it turns the idea into a concrete scene. The chapter opens with Jiang Li, I'm warning you, don't set your sights on Yinwan anymore, or..., adds pressure through Coming to his senses, he also switched to a kindly smile, "Alright, girl,..., and ends on Yet.