Might Duy

Duy was a tall and well-built man with high cheek-bones, a somewhat bulbous nose, dark hair, thick eyebrows and noticeable body hair on his wrists and forearms. His hair was cut in a bowl style that was combed to his right and lifts slightly. He also sported a bristling moustache with a small goatee and stubble which made up the rest of his beard. He wore a green jumpsuit, orange striped leg warmers, and a yellow scarf around his neck.

Duy spent his entire career as a genin, causing many to look down upon him and earned him the epithet of the "Eternal Genin" (万年下忍, Mannen Genin). Despite this, after twenty years of tireless training, Duy perfected how to use all Eight Gates. He later had a son, Guy, who showed little progress as a shinobi himself, failing his first attempt to enter the Academy. When Guy began feeling sorry for himself, Duy scolded him for not having faith, and ultimately taught Guy how to use the Eight Gates. One day, he and Guy met Sakumo Hatake and his son Kakashi in front of the Academy; Sakumo assumed their sons would be classmates, only to learn that Guy flunked the entrance exam. Some time after that, Duy rescued his son and his teammates, Ebisu and Genma Shiranui from the Seven Ninja Swordsmen of the Mist who had confronted the trio. Though his son argued that he was no match for the Kirigakure-nin, Duy reminded his son that he still had the Eight Gates technique and would use it under the very same condition of use he created — the protection of someone precious to him. In the anime, Duy's efforts ultimately killed four members of the famous group (Jinin Akebino, Kushimaru Kuriarare, Shibuki's wielder, and Hiramekarei's wielder).