Haku (The Icy Mask's Blade) is one of the limit-breakable characters. It can level up to 100.
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Attributes / Elements
Kabuto Yakushi (Surprising Regeneration)
Kakashi Hatake (The Best Teacher)
Sound Ninja ( Orochimaru's Soldier )
Senju Tobirama (Creator of Reanimation)
Naruto Uzumaki (Kyuubi Chakra Overflow)