Well, a really interesting plot twist in an Eren travels back in time fanfiction could be related to relationships. Say Eren goes back and realizes that his actions in the past have a huge impact on his relationships with his friends. Maybe he accidentally causes Mikasa to not be as attached to him as she was in the original timeline. Or he could find out that Armin was supposed to be the one with the time - traveling ability all along, and his interference messes up Armin's future plans. Also, what if he goes back and discovers that the real enemy wasn't the Titans but some other force that was using the Titans as a distraction, and his time - traveling journey is the only way to expose this truth.
A plot twist in such a fanfiction could be that Eren travels back in time and gets stuck in a loop. Every time he tries to change something, it just resets and he has to relive the same events over and over again. He might also find that the power to travel back in time is not unique to him. There could be other characters from different timelines or dimensions who also have this ability and are trying to manipulate events for their own gain. This could lead to a complex web of power struggles and alliances as Eren tries to figure out who to trust and how to break the loop and save his world from the Titans.
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."....
The best chapter pointer here is Chapter 26, "Sending My Big Brother to a Transformation Variety Show". It opens with Shen Lan was bent over processing a large stack of press briefs on her... and closes on If you think you can use our family connection to have me handle this....
If you want the clearest chapter reference, go to Chapter 11. Early on, After a meeting, Shang Shaojing pinched the bridge of his nose, tired, and...; later, the chapter leans on How is it going with the Jiang Family?" The assistant looked troubled and....
Chapter 38 is the strongest chapter-level answer because it starts from Jiang Li had also observed the girl who had just entered. and follows through on He Yun coldly turned his head and continued to maintain his aloof persona..
Chapter 46 is the strongest chapter-level answer because it starts from Upon hearing this, everyone but Jiang Li perked up with high alert. and follows through on Did you calculate the score incorrectly?!" And 13 points?!.
Chapter 3 is the strongest chapter-level answer because it starts from Qiao was still annoyed at the attitude of this unknown girl when she heard... and follows through on Jiang Yan, forced into a marriage with someone he did not love, had....
The best chapter pointer here is Chapter 15, "The Autistic Teen Jiang Shixu". It opens with Jiang Shixu woke up from those nightmares filled with blood and darkness,... and closes on Since she didn't move, Jiang Shixu also stayed put, and the kitchen, which....
Chapter 920, "College Entrance Exam Results Inquiry", is the clearest early answer because it turns Wan Huixia's situation into a concrete plot event. The chapter turns that into something concrete by moving from Outside the nursing home, Meng WanZhi anxiously waited in the car for...
Chapter 895, "Love Is Not Something You Can Buy or Sell at Will", is the clearest early answer because it turns Sell's situation into a concrete plot event. The chapter gives readers a real answer by opening on Dai Jing also joined in with a gossiping look: "Which young...
A practical answer is Chapter 47, because it turns the idea into a concrete scene. The chapter opens with Qi is actually second???] [Did the production team make a mistake?, adds pressure through The internet is so chaotic, all that previous slander might as well have..., and ends on Qi is so.