It could be some rogue shinobi who are jealous of Naruto's new - found power from being trained by the Kyuubi. They might form an alliance to take Naruto down. These shinobi could have their own motives, like seeking revenge on Konoha or wanting to use Naruto's power for themselves. They could be from other hidden villages or even some outcasts within Konoha.
The Akatsuki could still be the main antagonists. Even with Naruto's training by the Kyuubi, they would be after the tailed beasts. Their goals of collecting all the tailed beasts would put them in direct conflict with Naruto. And they have some really powerful members like Pain and Itachi.
Another possibility is that a new group emerges, one that is afraid of the power Naruto could gain from the Kyuubi's training. This group might see Naruto as a threat to the balance of power in the ninja world. They could be made up of some old - school ninja clans who believe in a more traditional way of power distribution and see Naruto's rapid growth as something that could disrupt their way of life.
Look to Chapter 11 for the clearest answer. It begins with After a meeting, Shang Shaojing pinched the bridge of his nose, tired, and..., keeps building through How is it going with the Jiang Family?" The assistant looked troubled and..., and lands on Miss Qin, please accompany us to the police.
If you want the clearest chapter reference, go to Chapter 37. Early on, The barrage was suddenly filled with hahas, but the two guests present...; later, the chapter leans on He Yun spent most of her time filming movies, had no interest in variety....
Chapter 884, "Master?!", is the clearest early answer because it turns Miss Jiang's situation into a concrete plot event. Early on, I've heard this temple is quite magical, but why are there so many.... By the end, After all, Master often goes on retreats, leaving the teaching to the....
The best chapter pointer here is Chapter 14, "She Looks So Cool Dancing with a Gun". It opens with Lin Manru had a rare good night's sleep. and closes on But clearly, Lin Manru was unable to accept that her delicate daughter had....
Chapter 878, "Do You Dare?", 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 Su Yinwan not only chose a remote location for the meeting, but the...
Chapter 8 is the strongest chapter-level answer because it starts from The resentment that had barely calmed among the crowd surged back two... and follows through on Other people with a handsome and charming appearance often try to conceal....
Chapter 891, "If You're a Man, Keep Drinking!", is the clearest early answer because it turns Jiang Zhao Yuan's situation into a concrete plot event. A useful checkpoint is the way the scene starts with Jiang Yan couldn't bother to coax these two little brats anymore.
If you want the clearest chapter reference, go to Chapter 53. Early on, Night had fallen over Chixia Village, eerily void of any human sounds.; later, the chapter leans on Jiang Li followed the village chief's wife down a narrow path leading to....
Look to Chapter 15 for the clearest answer. It begins with Jiang Shixu woke up from those nightmares filled with blood and darkness,..., keeps building through The two sleeping pills he took in the evening had left him with a..., and lands on Since she didn't move, Jiang Shixu also stayed put, and.