Sakumo Hatake

, also known as, is the father of Kakashi Hatake.

Appearance
Sakumo's appearance is similar to Kakashi, albeit without the Sharingan or the mask. Sakumo appears when Kakashi is about to be killed by Pein, which then Kakashi sees his father and start from the beginning of his life.

Personality
He was deeply devoted to his country and put his friends and teammates before anything else, so much so he sacrificed the completion of a mission in order to save his teammates which led to him being a public figure of hate and ridicule amongst the villagers and even those that he had saved.

Kakashi Gaiden
According to the Fourth Hokage, the legendary White Fang had a reputation that surpassed the Sannin in comparison. But, he fell into disgrace after botching a mission that caused Konohagakure to suffer great losses. Despite knowing how critically important completing the mission was, Sakumo chose the lives of his comrades over the success of the mission. He failed the mission and was discredited by both Konoha and the very same teammates he rescued. Dishonored, Sakumo fell into a deep depression, as well as a drop in his skills. Eventually, he committed suicide, which caused Kakashi to lead his life strictly according to the Ninja Code.

Rescue Gaara arc
When Kakashi and his team arrive in Sunagakure, he is instantly attacked by Chiyo who mistakes him for his father. It is implied that Sakumo killed Chiyo's son and his wife, during the war with the country.

Pain Invasion arc
During the battle against Pain, as Kakashi feels himself losing strength and consciousness, Kakashi finds himself in an area of darkness, where Sakumo meets up with his son to talk of his life.

Abilities
Like his son, Sakumo was a gifted shinobi praised for his talents in the ninja arts even by the likes of Minato Namikaze, the Fourth Hokage. In battle, Sakumo was a truly powerful shinobi, his prowess at least rivaling that of the Sannin. The mere idea of facing Sakumo brought fear to enemies, as shown from the reaction of an Iwagakure shinobi initially believing Kakashi to be his father. His primary weapon during battle was tanto called the White Light Chakra Sabre that when put in culmination with his chakra, which is already infamously strong and adaptive, enhances the strength of his chakra to the point it emitted a trail of white light from the blade when swung, earning him the nickname "Konoha's White Fang". After he died, he left his tanto for Kakashi, which was later on cut in half when Kakashi fought an Iwagakure shinobi.

Trivia

 * Due to his close resemblance to his father, Kakashi's mouth may be the same as his fathers shown in the picture above.
 * Though not visible in the above picture, Sakumo has a ponytail.
 * Sakumo looks a lot like Kakashi, only without the Sharingan and mask covering his face.