There's 'Lelouch and His Unseen Protector'. This fanfiction focuses on how the OC bodyguard uses unique skills to keep Lelouch safe. It shows their relationship evolving from a simple employer - employee one to a more complex bond as they face various challenges together.
One interesting fanfic could be 'The Guardian of Zero'. In this story, the OC bodyguard has a mysterious past that gets intertwined with Lelouch's plans. The author does a great job of creating tension and interesting character dynamics.
Chapter 574, "They Are Ill-fated", is the clearest early answer because it turns Shang Shaojing's situation into a concrete plot event.
Chapter 310, "Sister, Eat More", is the clearest early answer because it turns Jiang Cheng's situation into a concrete plot event.
Chapter 249, "Maxing Out Wilderness Survival Skills!", is the clearest early answer because the violence around Survival Skills becomes final instead of hypothetical. It opens with Jiang Yan's body subconsciously shivered twice.
Chapter 651, "Is This... A Military Fighter Jet?!", is the clearest early answer because the buildup finally cashes out in a real clash. The chapter turns that into something concrete by moving from He Pingzhang's first action upon being summoned was to rush to the...
Chapter 361, "Kids Make Choices, Adults Want It All!", is the clearest early answer because it turns Jiang Li's situation into a concrete plot event. It opens with Everyone knows that Suqing's forte is Double-sided Embroidery," Miss...
Chapter 410, "There's Something Wrong with This Lottery Box!", is the clearest early answer because it turns Miss Jiang's situation into a concrete plot event. The chapter gives readers a real answer by opening on Nina's voice had barely fallen when Pan Xing turned his gaze to Jiang...
Chapter 406, "Barely Considered Living", is the clearest early answer because it turns Is's situation into a concrete plot event. A useful checkpoint is the way the scene starts with With the help of government officials, Jiang Li and Jiang Yan quickly...
Chapter 635, "Forced Return to the Time-Space Administration", is the clearest early answer because it pushes Gu Yu into a new phase or setting. Early on, But Pei Ye was much quicker than she had imagined.. By the end, I'll join you." Saying so, he eagerly took the lead..
Chapter 224, "Won't You Consider Introducing Me?", is the clearest early answer because it turns Miss Jiang's situation into a concrete plot event. The chapter gives readers a real answer by opening on Jiang Li, ranked number one, was directly taken by the staff to an...
Chapter 227, "There's Something Wrong with This Stepmother", is the clearest early answer because it turns Yin Star's situation into a concrete plot event.