K

He is the partner of J.

Hunt for the Eight-Tails Arc
J and his partner both notice a huge explosion at Valley of Clouds and Lightning and they saw Killer Bee in his eight-tailed transformation. He said that the A|Raikage forbade him from transforming into the Eight-Tailed Giant Ox. As Sasuke Uchiha defeated and captured Killer Bee, he stated that the Raikage won't be pleased when he found out about his brother. As J went to trail Taka, his partner went to inform the Raikage of Killer Bee's capture. J's partner waited for him to return from Taka's hideout, but he didn't return. He headed back to the Raikage to tell him J was either killed or captured.