Mikayo is a nineteen-year-old jounin from Kirigakure. Despite being a member of Yuki clan's branch house, she managed to learn clan techniques properly and became very capable kunoichi that made her able to obtain her current rank.
She's a practical young woman who pulls no punches. That fact is obvious especially when treating her students on team A. When speaking, Mikayo uses Same-ben* - the more she's upset, the less people understand what she says.
In past, Mikayo used to be a proud and cheerful child who wanted to serve as a ninja for the sake of Kirigakure. Everything changed when her parents died in the line of duty. While the girl was shaken by the death of her parents, her grandparents were proud of the sacrifice made by their own children. Soon, Mikayo heard her parents blew a chance of retreat and went on rampage to kill as many enemies as possible only to show Kirigakure’s power. She realized the mentality of the whole village was the same.
It was her uncle who proved not everyone thought that way and prevented the girl form isolating herself from the world around her.
During her student years, she learnt to keep her head down. Still, she secretly hopes someone strong enough will appear and defeat the current mizukage who is the source of such a stupid mentality.
*She speaks the dialect of Same Island which is situated south-east of the Main island in Land of Water. I’d compared the dialect with Kansai-ben in Japanese and Ostrava dialect in Czech. She learned the dialect from her uncle, who was born in the main village of Same Island.