Hattori's Katana

 is a melee weapon which has a special charge attack that will be activated if the attack button is held down after an attack. The charged attack deals damage.

Trivia

 * This weapon, along with the Blade Master's Outfit, is a reference to the Kill Bill franchise.
 * It in particular is named after Hattori Hanzō, the sword-smith who created the weapon.
 * This weapon was added due to high popular demand for a katana weapon, similarly to the and the.