The Half-Zatoichi is a melee weapon for the Demoman and the Soldier. The Half-Zatoichi is a weapon with the unique ability of regenerating all of the health on the wearer upon a successful kill, however, until a kill is attained, you are incapable of switching weapons.
Due to this, it is more useful to the Demoman than the Soldier, as the Soldier doesn't have very many conventional methods of getting into close-range, while the Demoman has many, making it useful for a "Demo-Knight" strategy. Although not practical, the Soldier makes excellent use of the Half-Zatoichi while moving quickly. This may be accessed by rocket jumping, a team buff, or a Disciplinary Action hit by an ally.