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 him and J see 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 states the Raikage won't be pleased when he finds out about his brother. As J went to trail Taka, his partner goes to inform the Raikage of Killer Bee's capture. J's partner waits for him to return from Taka's hideout but he doesn't return. He heads back to the Raikage to tell him J was either killed or captured.