Sakumo Hatake also known as Konoha's White Fang was a renowned, high ranking Konohagakure shinobi.
Sakumo was a famous and powerful ninja of Konohagakure who, during his lifetime, held fame that was said to overshadow even that of theSannin. His son, Kakashi, idolised him and sought to become just as great a ninja as his father; his wife had died when Kakashi was very young. At some time in his life, Sakumo killed Sasori's parents, earning Chiyo's hatred. Five years before the events of the Kakashi Gaiden, Sakumo and his team were sent on a mission of great importance to Konoha. When his team-mates' lives were endangered, Sakumo chose to abandon the mission in order to save them. The impact of the mission's failure caused Sakumo to be vilified by the Land of Fire, the villagers of Konoha, and even those he had saved.
Dishonoured, Sakumo fell into a deep depression, which caused his abilities to suffer as a result. Eventually, he committed suicide, which drove Kakashi to live strictly according to the Shinobi Rules during the time before his last mission with Obito Uchiha.
Sakumo was a very kind and loyal man. Despite his tremendous fame and power as a ninja, he was a very humble man, which made his only son Kakashi truly look up to and idolise him. He had a deep devotion to Konoha and an even greater commitment to his allies and loved ones to the point he would put their well-being before anything else; his commitment was so great that he would sacrifice the completion of a mission in order to save his team-mates, which led to him being a public figure of hate and ridicule.
He was also seemingly very proficient in kenjutsu with his primary weapon during battle being a tantō called the White Light Chakra Sabre that would emit white chakra when wielded, earning him the nickname "Konoha's White Fang". After he died, he left his tantō to his son.
What was most important about the White Fang was how he influence Kakashi's beliefs. Kakashi's belief that those who abandon their mission are trash, but those who abandon their comrades are worse than trash had a direct influence on Naruto, himself. It in fact was the main lesson in Kakashi's bell test on team 7. He was notorious for not passing any of his students, but he passed all of team 7 even though they disobeyed his direct orders bc they tried to protect each other.
To me the White Fang may be one of the saddest Naruto characters. He was a legendary shinobi who skills surpassed even the legendary Sannin. He was loyal, and devoted to his friends, family, and village. He lost his wife at a young age, yet continued fighting with high ideals. And all his friends and all his deserved respect was taken away because he refused to let his comrades die. He abandoned his mission to save the lives of his comrades and for that he was made a pariah? All that made me think is that the Shinobi world has a lot of problems……..