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Haku's kekkei genkai, Ice Release (氷遁, Hyōton, Viz: Haku's Secret Arts of Water, English TV: Ice Style) allowed him to combine wind and water-based chakra to create ice which he could manipulate through willpower alone. The ice Haku created was largely immune to fire-based attacks, only melting slightly when coming into contact with flames. Using his special ability, Haku developed the Demonic Ice Crystal Mirrors, which allowed him to create any number of mirrors made of ice to use as a shield or trap an opponent.
Without the Kekkai Genkai
In the first Naruto movie, several of the Yukigakure ninja also had the ability to use Ice Release techniques. However, this was not the product of a similar kekkei genkai, as demonstrated by Kakashi's ability to replicate one of these techniques with his Sharingan. In addition, unlike Haku, who could create his own ice, the Ice Release techniques used in the movie required the users to manipulate already existing ice. The Yukigakure ninja most commonly used the Dog hand seal.
Renga was also able to use a type of Ice Release technique without having the kekkai genkai.