Kisame Hoshigaki (干柿鬼鮫, Hoshigaki Kisame), feared as the Monster of the Hidden Mist (霧隠れの怪人, Kirigakure no Kaijin), was an from 's and was partnered with when the latter joined .
Before becoming known as a member of the , Kisame was assigned to the by his superior, to guard them. While resting, the team was cornered by 's platoon during a mission. Kisame chose to kill his team-mates in order to prevent any information from being leaked out.
He later killed his master when he realised that he was selling information as well, taking control of for himself and also replacing him as one of the Seven Swordsmen. Approached by the Fourth , , who commended him for his act of loyalty to Kirigakure, Kisame rebuked him and revealed his disillusion. He said he no longer believed he really was loyal to the village while he was killing his fellow Kiri ninja, calling his life of betrayal and murder nothing but a "living lie". then revealed himself as the one controlling Yagura from the shadows, intimating to Kisame his . Kisame was at first sceptical of Madara's identity and thought his plan was insane, before he realised he wanted to experience this "world of truth", paving his way into becoming one of the first and most loyal members of .
While in Kiri, Kisame is given the title of "Monster of the Hidden Mist". He is also known to have formed a connection to and . His former country, the , sought him out for plotting to overthrow its government and being involved in numerous assassinations, including that of a of an unknown country. As a member of , he was partnered with . Though they initially greeted each other with hostility, they became good partners and shared a common bond of having betrayed the people closest to them.