Mizuki

is a of Amegakure and a member of Team Kuwakamura. With the Academy Graduation Test, she bested in the 'art of killing' that is a subject of her village's Academy. This may have been due to have trained under the former Captain of the Reconnaissance Corps, whom still has interest in her future growth.

Background
Having never had the chance to know her parents, Mizuki became an orphaned child that lived on the streets of Amegakure's slumbers since her childhood. There, Mizuki, had learnt the matters to survive: to kill or to be killed, to steal or to be stolen. Her necessities would be to steal primaries from the salesmen in the "better" districts. To be caught doing so would threaten the survival chance, because the salesmen would either beat or kill the thief; young or old, it doesn’t matter to them. Mizuki lost "comrades" through that, and, eventually, had been caught herself. This would have had been her diminish, had not the "Ruler of the Underground" interfered with her punishment.

That event changed her life, whether it was for the best or not, Mizuki became her very disciple to repent her debt. Before that, she had been exposed to murder (having committed them herself too) and struggled to survive in such a violent area. It changed even more after becoming a "child" of Mizusashi, who later sent her off to the Academy to conceptionally be taught the Art of Shinobi.

Trivia

 * Her name, Mizuki, is written with "五月" which means "Early-Summer". It is a reference to her birth of date.