Ken

A teenager who is an expert in knife throwing. During his stay with NijMens his role during a job was usually more in the execution stage than the planning or preparation stage. He was the one who originally shortened Chizuko to Chiko a nickname which Chiko quickly picked up on. Chiko calls him Kenniichan lit. older brother Ken as he appeared to be the youngest member of the band save Chiko and the two were very close. He was the one who taught her to throw knives. Source: Wikipedia