Haku (白, Haku) was an orphan from the Land of Water, and a descendant of the Yuki clan. He later became a shinobi under Zabuza Momochi‘s tutelage whom he later partnered with, ultimately becoming a Mercenary Ninja.

  Haku was born in a small, snowy village in the Land of Water, a land that had suffered from war not long before. In this war, different sides battled each other using ninja, some of whom possessed kekkei genkai. After the war ended, memories of the horrific battles still lingered in the minds of the people. Those with kekkei genkai quickly became feared and hated for their abilities, out of concern that their existence would only bring about more war.