Shi (Isei)

Yuki Uchiha was a member of the extinct Uchiha Clan, from Konohagakure.

Background
Yuki Uchiha was the mother of Sayotsu Uzumaki and the wife of Kame Uzumaki she was killed during the uchiha massacre leaving behind her new born son.

Personality
she is shown to have a cheerful disposition around his subordinates she had an happy go lucky attitude however she had a caring behaviour for the ones she loved.

Sharingan
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Trivia

 * The only reason why tobi didn't kill sayotsu was Tobi was not aware of the fact Yuki had given birth to a child.