Definitely Orochimaru. He has great power and knowledge, and if Naruto could convince him, he would be a valuable ally. Another one could be Pain. Since Pain had his own ideology about peace, Naruto could find common ground with him and unite him.
Madara Uchiha could be a key villain. Despite his extreme views, Naruto might find a way to reach him. And then there's Obito. Naruto's ability to see the good in people would make him attempt to unite Obito, who was once a major threat but also had his reasons for his actions.
The best chapter pointer here is Chapter 240, "He's the Last One?!". It opens with Wuuuuh He Bao truly deserves it, Mom always knew you could do it!"... and closes on Right then, her face turned completely sour..
Look to Chapter 230 for the clearest answer. It begins with Shang Shaojing's expression wasn't looking too good either., keeps building through He had always been the winner in any field, and there had never been an..., and lands on If he knew that your stepmother was secretly prompting you.
The best chapter pointer here is Chapter 271, "How Did Shen Lan Marry an Old Fool?!". It opens with He had barely finished speaking when he received a withering look from... and closes on Gathering her thoughts, Jiang Li looked toward Jiang Yan, who was still....
The best chapter pointer here is Chapter 244, "Come, Let Brother Give You a Kiss". It opens with LOL, Director Sun can't seriously think his sappy quotes are working, can... and closes on I don't really have much to say..
Chapter 259 is the strongest chapter-level answer because it starts from While the villagers of Chixia Village were all immersed in the revelry of... and follows through on It wasn't that he was scared..
Look to Chapter 246 for the clearest answer. It begins with At that moment, not only Su Yinwan but also Shang Shaojing's complexion..., keeps building through Beside them, Shu Yan wore the shocked expression of someone who had got..., and lands on Your phones have also been placed at each of your.
A practical answer is Chapter 223, because it turns the idea into a concrete scene. The chapter opens with So, for the first time, Jiang Yan, who had always styled himself as the..., adds pressure through He could simply have someone send a flurry of gifts and make some..., and ends on The damned.
A practical answer is Chapter 263, because it turns the idea into a concrete scene. The chapter opens with Southwest Wildlife Protection Association V: On the evening of July 10 of..., adds pressure through Aside from Wen Jiaojiao and the others, her family had also called her..., and ends on But.
The best chapter pointer here is Chapter 260, "Did You Take All These People Down?!". It opens with Yan Dabiao, who deeply felt the sting of deception, flew into a rage and... and closes on However, if this situation arises again, you can't act so rashly..
The best chapter pointer here is Chapter 214, "The Last Day". It opens with Director Sun fell silent for a second. and closes on Even when Wen Jiaojiao fanned Richards' face frantically, he remained....