Kosaka Clan

The Kosaka Clan ( 小坂のクラン Kosaka no Kuran) is an infamous clan of well trained and skilled assassins that live on a remote island in the Grand Line. The Kosaka clan was respected and praised heavily for their consistent record of assassinating notorious pirates and handing them over to the marines, creating a steady relationship between the two.

Several years before the current story line, Ryu Kosaka (the former head of the clan) defected from the family and took the head of an important Marine official, leaving his former clan to be thought of as traitors and labelled as criminals by the World Government.

Trivia

 * Like the Wado County, the Kosaka Clan are a family who have been given the name of a position related to some fictional character, in this case "Ninjas".