It turned out that although the two brothers, Ice and Haku, had awakened the power of Ice Release, without specialized guidance or systematic training, neither had developed it any further. Their abilities were limited to coating the wooden sticks in their hands with a thick layer of ice to increase their lethality, or condensing an ice spike less than half a meter long in their palms and firing it at a target—barely reaching the level of an E-rank ninjutsu.
The brothers relied on this ability to barely hunt on the ice plains and keep themselves from starving to death.
Speaking of Haku, Shisui recalled the memories he had of him.
As one of the important figures in the early storyline, Haku had originally been a boy with long black hair and the appearance of a beautiful girl. He was kind by nature, but for Zabuza Momochi's sake, he could turn into a merciless fighting "tool" at any time. Whenever he wanted to protect something important, he became incredibly strong.
Haku primarily used Water Release ninjutsu and Ice Release, his Kekkei Genkai. He excelled at taking down opponents with senbon needles and could form hand seals with a single hand, allowing him to unleash ninjutsu attacks faster than ordinary ninja.
As Zabuza's tool, Haku had a powerful desire to protect him and was unwilling to let him suffer even the slightest harm. When Gato tried to grab Zabuza by the neck, Haku broke Gato's arm. But if Haku had not broken Gato's arm, Zabuza would have killed him. Haku stopped him because he did not want the still-wounded Zabuza to suffer through another escape.
After being defeated by Naruto Uzumaki, Haku asked Naruto to kill him, because he believed that, having failed, he was no longer useful to Zabuza.
But when