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.
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.
Chapter 326, "Jiang Mingyu Stranded in a Foreign Land", is the clearest early answer because it turns Jiang Li's situation into a concrete plot event. Early on, And at this moment, on the other end of the Earth.. By the end, Ah, that's not right, in this place, your eyes should convey a....
Chapter 323, "Approaching Labor, the Talented Xiao Family Assembles Urgently", is the clearest early answer because it turns Xiao Kangcheng's situation into a concrete plot event. Early on, How many advanced Cold Beasts are there at the Beehive, capable of.... By the end, Usually, they just join hunts for low-level Cold Beasts..
Chapter 338, "Rapid Progress, Martial Arts Skills, Dual Advance Eastward, Dormancy Period", is the clearest early answer because the violence around Beining Mountain becomes final instead of hypothetical. It opens with In four years of governance, whether in terms of vision or scale, Xia... and closes on Great Xia advances eastward on two fronts: the Xing Valley Pass line,....
Chapter 345, "Mirror Valley Defense Commander Luo Ming, Beast Tide, Great Xia's 6 Armies (Part 2)", is the clearest early answer because it turns Creation Value's situation into a concrete plot event. The setup is Last June, Luo Ming led his team in Arrow Bamboo Forest to..., but the pressure keeps building through It was the third type of Advanced Cold Beast they had hunted, so....
Chapter 341, "Moao's Nine Garrisons, the Inspection System and Zhenyu, Li Hu and Hong Yuru (Part 4)", is the clearest early answer because it turns Great Xia's situation into a concrete plot event. Early on, After explaining the general situation he had seen, Lu Yang's brows.... By the end, None of them had been to Beishuo before, and it was unlikely that He....
Chapter 335, "Songyang Ridge, Seven Houses Surrender, First Batch of Silver Arrives", is the clearest early answer because it pushes Songyang Ridge into a new phase or setting. The chapter turns that into something concrete by moving from In the third year of Great Xia, on the eighth day of August, during... to I was shortsighted." "As expected, the lord is far-sighted..
Chapter 320, "How is She Here Too?!", is the clearest early answer because it turns Su Yinwan's situation into a concrete plot event. A useful checkpoint is the way the scene starts with Although she thought this way, Su Yinwan still knew the importance of...
Chapter 339, "The Changes of Li Hu and Yang Zhong, the Hou Family's Opportunity, Advice (Part 4)", is the clearest early answer because it turns Hou Jing's situation into a concrete plot event. The chapter gives readers a real answer by opening on Only now did Yang Zhong remember that Li Tiancheng in front of him is... and ending on Just from the personnel configuration, you can tell how significant....
Chapter 349, "Attempting to Cheat, East Ridge's Strength, Lu Yang's Tactics", is the clearest early answer because it turns Lu Yang's situation into a concrete plot event. The chapter gives readers a real answer by opening on Upon hearing these words, Zhu Tong was finally certain that Lu Yang's... and ending on What do you think?" Seeing their expressions of struggle, Lu Yang.... In story terms, the chapter closes with "I had noticed before;
Chapter 329, "Refining the Jade Dew Stone, Eve of the Cold Element Festival", is the clearest early answer because it turns Han Yue's situation into a concrete plot event. Early on, Xia City, Political Hall Upon returning, Xia Hong immediately.... By the end, Li Xuanling refining the Jade Dew Stone in her body should have....