Lelouch would be a likely candidate. He has a strong sense of justice and a desire to change the world. Given his intelligence and strategic mind, if he were to discover the means of time travel, he would likely use it to correct the many wrongs in the Code Geass world, such as the oppression of Britannia. He could go back in time to prevent his mother's death and change the course of his own life and the fate of the world.
C.C. might also be a possible character to start time travel. She has a mysterious past and a deep connection to Geass. Since she has lived for a long time and witnessed many events, she could use time travel to fix some of the mistakes or tragedies she has seen. Maybe she wants to prevent the misuse of Geass or change the way the world has developed due to Geass. Also, she might have some knowledge or power related to time travel that we don't know about yet in the original series.
The best chapter pointer here is Chapter 34, "Official Recording!". It opens with Seeing that the public sentiment wasn't quite right, Su Yinwan felt... and closes on Now that Lili is misunderstood, they start to kick us while we're down."....
If you want the clearest chapter reference, go to Chapter 38. Early on, Jiang Li had also observed the girl who had just entered.; later, the chapter leans on Before arriving, she had briefly reviewed the profiles of the other three....
If you want the clearest chapter reference, go to Chapter 8. Early on, The resentment that had barely calmed among the crowd surged back two...; later, the chapter leans on Some of them were relatives of the Jiang Family, who felt it improper to....
Chapter 1 is the strongest chapter-level answer because it starts from Jiang Li, I'm warning you, don't set your sights on Yinwan anymore, or... and follows through on Yet before she had the chance to teach her a lesson, the male lead arrived....
Look to Chapter 29 for the clearest answer. It begins with Big brother, it's me..." The shadow suddenly spoke and it was Jiang..., keeps building through Jiang Yan retracted the hand that he was about to throw something with., and lands on Big brother, are you unwilling?" His mournful expression.
If you want the clearest chapter reference, go to Chapter 36. Early on, But soon, people began to question the authenticity of Jiang Li's bare...; later, the chapter leans on After all, these days, faux bare-faced makeup can be indistinguishable....
Look to Chapter 32 for the clearest answer. It begins with You should know, an ID photo is like a mirror for demons., keeps building through Even celebrities can't handle going barefaced under the attack of a..., and lands on With airflow comes water flow, and your fortune will naturally.
Chapter 936, "When Did the River Moon First Shine on People [Extra: River Moon Chapter]", is the clearest early answer because it turns Jiang Yan's situation into a concrete plot event.
If you want the clearest chapter reference, go to Chapter 32. Early on, You should know, an ID photo is like a mirror for demons.; later, the chapter leans on Even celebrities can't handle going barefaced under the attack of a....
Look to Chapter 36 for the clearest answer. It begins with But soon, people began to question the authenticity of Jiang Li's bare..., keeps building through After all, these days, faux bare-faced makeup can be indistinguishable..., and lands on After swallowing the food in his mouth, he hurriedly.