Kōsen Hayabusa (鷹を交戦, Hayabusa Kōsen; Japanese for Warring Falcon) is the father of Nesshin'na Hayabusa, and a Chunin of Getsugakure. His wife died in battle some years ago, and he fell into despondency, eventually recovering but never being able to improve as a ninja because of a mental block that developed. Because of this, he became known as the Eternal Chunin, and remains such at the age of twenty-nine.