Naruto could also be sad. He has always considered Konoha as his home and the people there as his family. When they start experimenting on him, it's like his family has betrayed him. He might feel isolated and alone, especially if no one comes to his aid. In his sadness, he could either give in to the experiments for a while, thinking that he has no other choice, or he could find an inner strength to fight back, fueled by his emotions. This would all depend on the nature of the experiments and the people involved in the fanfiction.
He would probably be very angry. Naruto has always been a free - spirited person, and being experimented on against his will would be a huge violation of his rights. He might initially try to resist physically, but as the situation gets more complex, he could start to plot his escape and revenge.
At first, Naruto might be confused. He trusts Konoha, and when this sudden experimentation starts, he can't believe what's happening. He would try to talk to the people in charge, like the Hokage or his teachers, to find out why they are doing this. But if they don't give him satisfactory answers, his confusion would turn into determination to break free. He would use his wits and his ninja skills to try and get away from the experimenters. And as time goes on, he could become more bitter towards Konoha, which would be a big change from his usual positive attitude towards his village.
The best chapter pointer here is Chapter 67, "You Can Still Pick Mushrooms?!". It opens with I'm pissed," Jiang Yan cursed again, "These people are too much, aren't... and closes on Accompanied by the wisps of smoke gradually rising from the stove behind....
The best chapter pointer here is Chapter 74, "Ordinary People". It opens with Having seen Jiang Li's ID before, he knew that this person named Shiguang... and closes on The man's phoenix eyes narrowed slightly, he looked at the girl sitting....
Chapter 78 is the strongest chapter-level answer because it starts from He Yun, too, tidied up and walked over to rest in the shade of a tree. and follows through on [HAHAHA, is it just me or does Movie Emperor He seem to be showing off a....
Chapter 96 is the strongest chapter-level answer because it starts from Jiang Li's words seemed absurd, yet there also seemed to be a trace of... and follows through on Xu Ling couldn't contain her soft sobbing, "How could this happen?.
The best chapter pointer here is Chapter 103, "Selling a Kidney to Repay Debt". It opens with Jiang Yan looked at Zhao Lang with suspicion, eyeing the dark substance in... and closes on Jiang Yan felt deep guilt welling up inside him..
Chapter 76 is the strongest chapter-level answer because it starts from Thinking of this, the aunt repeatedly praised, "Girl, hearing your words... and follows through on Soon, Shu Yan also couldn't hold out any longer, leaning against the tree....
If you want the clearest chapter reference, go to Chapter 78. Early on, He Yun, too, tidied up and walked over to rest in the shade of a tree.; later, the chapter leans on After more than an hour of basking in the sun, his cheeks were....
A practical answer is Chapter 57, because it turns the idea into a concrete scene. The chapter opens with Lu Xingchao's numerous fans were stunned., adds pressure through Do you even consider me your brother?, and ends on I'm saying, big bro, can you at least reply to me?.
Chapter 121 is the strongest chapter-level answer because it starts from Seeing that Wen Jiaojiao's condition had improved significantly, Director... and follows through on You're supposed to be a man who conquers mountains!] Experienced and....
The best chapter pointer here is Chapter 72, "Jiang Li Resembles an Early Capitalist". It opens with Jiang Yan was still griping when suddenly a fair hand reached out beside... and closes on Think about it." Jiang Yan fell silent..