There might be a fanfiction where Naruto discovers some dark secrets about his family or the village. For example, finding out that the village was involved in some unethical experiments on his family in the past. This new knowledge could be so overwhelming that it mentally breaks him. He may struggle with feelings of anger, betrayal, and confusion, and his actions and personality would change drastically as a result.
One example could be a fanfiction where Naruto is betrayed by all his friends in the Hidden Leaf. This shatters his belief in friendship and makes him mentally broken. He might isolate himself and lose his usual positive attitude.
In some 'naruto mentally broken fanfiction', Naruto could face a situation where he fails to protect the village from a major threat. The guilt of not being able to fulfill his duty as a shinobi might break him mentally. He could start doubting his abilities and his purpose in life. For instance, if he fails to stop an enemy from destroying half of the village and many lives are lost, it would be a huge blow to his mental state.
Chapter 346, "Elite Warriors, One Against Three, The Cause of the Beast Tide [10,000-Word Chapter, Continued Tomorrow]", is the clearest early answer because the buildup finally cashes out in a real clash. The chapter gives readers a real answer by opening on Nowadays, any of these six armies alone, placed five years ago, would... and ending on Thus, in Great Xia, it's a comparison of who breaks through more....
Chapter 326, "Jiang Mingyu Stranded in a Foreign Land", is the clearest early answer because it turns South America's situation into a concrete plot event. A useful checkpoint is the way the scene starts with And at this moment, on the other end of the Earth.
Chapter 347, "Mirror Valley Council, Power Surge, Dajue Temple, Eight Battalion Tournament (Part 2)", is the clearest early answer because it turns Cold Resistance Level's situation into a concrete plot event. It opens with Xia Hong stepped into the hall and directly took the main seat. and closes on The existing Cold Resistance Levels in the camp had adequate Yangyuan....
Chapter 334, "Hanqiong's Seven Divisions, Moao Mountain, Hearing Beishuo Again", is the clearest early answer because it turns Zhu Shun's situation into a concrete plot event. Early on, Year three of Great Xia, the sixth day of August, just after.... By the end, Lu Yang never intended to compare with Long Mountain..
Chapter 34, "Official Recording!", is the clearest early answer because it turns Shang Shaojing's situation into a concrete plot event. Early on, Seeing that the public sentiment wasn't quite right, Su Yinwan felt....
Chapter 349, "Attempting to Cheat, East Ridge's Strength, Lu Yang's Tactics", is the clearest early answer because it turns Gu Tianxiong's situation into a concrete plot event. A useful checkpoint is the way the scene starts with The saying "Gaining ten thousand jins of silver is not as valuable as... and follows through with From now on, don't think about setting foot in Beining Mountain again!.
Chapter 109, "Not One Deserves to Stay on His Friends List!", is the clearest early answer because it turns Zhao Daniu's situation into a concrete plot event. The chapter gives readers a real answer by opening on And another thing," Jiang Li said, taking out a tissue to wipe her...
Chapter 279, "The Sudden Blaze", is the clearest early answer because it turns Jiang Li's situation into a concrete plot event. The chapter gives readers a real answer by opening on After getting a good scolding, Jiang Yan resigned himself to lying...
Chapter 173, "Su Yinwan, You Did It on Purpose, Right?", is the clearest early answer because it turns Jiang Yan's situation into a concrete plot event. A useful checkpoint is the way the scene starts with Jiang Li finally rose from her seat.
Chapter 334, "Hanqiong's Seven Divisions, Moao Mountain, Hearing Beishuo Again", is the clearest early answer because it turns Yangyuan Pills's situation into a concrete plot event. The setup is Lu Dong and the other six stood up with a rush, their faces full of..., but the pressure keeps building through These four consecutive pieces of good news were truly abundant in....