Zabuza has been called the Demon of the Hidden Mist; this is because during his childhood, he killed over 100 of the ninja academy graduates attending their final exam. In the exam, each student would be pitted against the other in a battle to the death. The massacre ended this tradition immediately.
His fame grew over the years, as he became both an ANBU and a member of the Seven Ninja Swordsmen of the Mist. He eventually attempted to kill the Mizukage in a failed coup d’état, and subsequently fled. Just …