Maruboshi, Kosuke

まるぼしコスケ

Kosuke Maruboshi (Maruboshi Kosuke) is a Konohagakure genin, known to others as the Ten-Thousand-Year Genin (Mannen Genin).
Kosuke has held the rank of genin for more than fifty years, which is why others call him the Ten-Thousand-Year Genin. As a child, he made a reckless decision that cost his teammates their lives. Ashamed by this, he felt unworthy of promotion beyond genin rank. Nevertheless, he continued to train arduously to improve his skills, as insisted upon by Tobirama Senju. During his service as a ninja, he served under the Second, Third, and Fourth Hokage, and apparently even the Fifth Hokage. At other times, he fought alongside Jiraiya and Sakumo Hatake.
Kosuke is an elderly man whose once-black hair has turned gray and is worn in a short ponytail. He wears a mesh armor shirt under a short brown sleeveless kimono, along with gray pants. He is usually seen smiling. He carries a metal pan used for various purposes, from cooking during missions to serving as a weapon in battle. He also carries a ladle and a sword sheathed horizontally across his lower back.
Although his official rank is genin, he is skilled enough to become a Jounin, a promotion he has declined repeatedly. He has demonstrated considerable taijutsu skill, using only his cooking utensils to defend and maneuver against enemy attacks. He is also a skilled kenjutsu fighter, wielding a sword and a hidden blade concealed in his prosthetic left leg, both of which he can use to strike with deadly precision. He also demonstrated a unique technique combining genjutsu and kenjutsu to confuse and petrify his opponent, making it easier to strike them down.
When he was younger, the Second and Third Hokage taught him many techniques. His training under the Second gave him highly proficient skill in high-caliber water release techniques, allowing him to use techniques such as the Water Release: Water Dragon Bullet Technique and Water Release: Water Encampment Wall. He also learned the Shuriken Shadow Clone Technique from the Third Hokage.
In addition to combat skills, Kosuke is a highly capable survival expert and cook.
He was placed on a team with Hayama Shirakumo, Tekuno Kanden, and Naruto Uzumaki to guard the village borders after Orochimaru and Sunagakure's invasion. He remarked that Minato had left behind a fine son, showing that he was one of the few people aware of Naruto's lineage.