Birthdate: July 25
Zodiac sign: Leo
Gender: Male
Species: Synthetic Human
Height: Gaiden: 149 cm
Affiliation: Otogakure Symbol Otogakure
Ryūchi Cave Symbol Ryūchi Cave
Konohagakure Symbol Konohagakure
Team: Team 7

He is a Konohagakure shinobi. He's also a teammate of Boruto Uzumaki and Sarada Uchiha.

Mitsuki has a brother called Log, who is revealed to be a synthetic clone of Mitsuki.
Born in an unspecified village, Mitsuki, under unknown circumstances, became a shinobi of Konohagakure, where he currently resides.
In the end of Boruto: Naruto the Movie, it is revealed that he is the son of Orochimaru.
In Naruto Gaiden: Michita Tsuki ga Terasu Michi, it is revealed that Mitsuki is a synthetic human created by Orochimaru.
(Source: Narutopedia)