Jubei

Jubei was an unfortunate fixer who was killed thanks to the incompetence of Whisper, where he killed the oyabun's daughter Pai.

Jubei was the first character to commit harakiri to atone for his failure, his and Pai's death forever will weigh on Whisper's hands.

His head was cut off by Jinx as his choosen's chunnin.

(One of Jinx's happiest moments, of course, he did use X-ray vision in that scene... so maybe it was all a dream - Stephen)
(Its easy to blame others for your own failures, when will people accept teh consequenses for their own actions? - Richard)
(Yes Richard! When will you stop laying the blame on others??? - Marc)