I think Kakashi could be a likely time traveler. He has seen a lot of pain and loss in his life, and if he had the chance to go back to the clan wars, he might try to prevent some of the events that led to the current state of the ninja world. He is also very intelligent and could adapt well to the different time period. Plus, his Sharingan might give him an advantage in understanding the power dynamics during the clan wars.
Naruto himself could be a likely time traveler. He has a strong sense of justice and a desire to prevent tragedies. If he learned of a way to travel back in time to the clan wars, he would probably try to stop the bloodshed and promote peace among the clans. Another possibility is Sasuke. Given his past and his connection to the Uchiha clan, he might want to go back to the clan wars to change the fate of his clan, especially the massacre.
Chapter 285, "Two Clans in Turmoil—What Does White Dew Gu Want to Guard?", is the clearest early answer because it turns Long Mountain's situation into a concrete plot event. The setup is Liu Yuan had captured a young man in white clothing., but the pressure keeps building through He probably witnessed the Cloud Dragon Army slaughtering the Cold....
Chapter 274, "Weakness and Strength, the Final Battle Begins (Part 2)", is the clearest early answer because the buildup finally cashes out in a real clash. A useful checkpoint is the way the scene starts with The strength gap between us is threefold, Master Luo. and follows through with In a panic, he could only retract his large saber to block his side..
Chapter 315, "New Policies for Long Mountain, Cold Apple Tree and the Silver Mine (Part 2)", is the clearest early answer because it turns Xia Hong's situation into a concrete plot event. The setup is In April, the march begins from Xia City to Longyou; in May, the..., but the pressure keeps building through Four months of consecutive large-scale personnel movements, and not a....
Chapter 256, "Yuwen Dao's Speculation and the Jade Bone Medicine (Part 2)", is the clearest early answer because the rescue effort creates visible on-page results. The chapter gives readers a real answer by opening on Furthermore, Yuan Cheng told me that on the night the White Dew... and ending on But as soon as Xia Hong spoke, Xia Chuan immediately stopped him..
Chapter 338, "Rapid Progress, Martial Arts Skills, Dual Advance Eastward, Dormancy Period", is the clearest early answer because Lu Yang finally turns buildup into a real advancement. Early on, Lu Yang nodded, then continued speaking after sitting down: "Beining.... By the end, What I found out is that besides a population of over 20,000, a....
Chapter 313, "Migration Preparations, Population Boom, Cold Resistance Level Arrangements", is the clearest early answer because Great Xia finally turns buildup into a real advancement. It opens with This number surpasses the peak Cold Resistance Levels during the Long... and closes on The night before, Xia Chuan had explained the current system of Great....
Chapter 268, "Advancement, Warnings, and Inspections", is the clearest early answer because Cold Beasts finally turns buildup into a real advancement. It opens with The dying Demon Sheep was evidently a bit hysterical. and closes on After signaling for the evaluations to continue, he turned directly.... The key payoff is that it turns Cold Beasts's growth into a concrete upgrade step and sets up the next payoff in the power growth storyline linked to Demon Sheep.
Chapter 239, "Changing Situation, Great Xia Special Envoy (Part 2)", is the clearest early answer because it turns Li Xuanling's situation into a concrete plot event. The chapter gives readers a real answer by opening on If those 1500 people were all regular troops, plus one Hong Xia, and... and ending on This is not right, Great Xia swiftly taking Wushuang wasn't because.... In story terms, the chapter closes with "Great Xia must be well-informed about the current situation in Longyou.
Chapter 261, "The Shock of Peng Bo and Chen Yingyuan, Great Xia Martial Gathering (Part 3)", is the clearest early answer because it turns Aunt Mei's situation into a concrete plot event. A useful checkpoint is the way the scene starts with Liu Ming might simply think that his grandfather is not too... and follows through with Brother Peng, just think of the Xia Hong and Xia Chuan brothers,....
Chapter 300, "Perseverance, Beast Tide Breaks the Barrier (Part 2)", is the clearest early answer because it turns Long Mountain's situation into a concrete plot event. The setup is Everyone heard the words, including Yuan Cheng, and immediately..., but the pressure keeps building through Indeed, although the barricade is ten meters thick, it is still iron....