Selene from the series called Jonathan's Diary!!!

Mitsuki, also known as Selene, is a member of the criminal organization known as "The Lotus.". She served as an ally for story protagonist Jonathan later becoming one of the founders of The Tytos along with Redt and Samantha being his specialty stealth and murder.

Before the war she was trained and raised as a perfect murderer and spy capable of ending the lives of targets given by the organization of the lotus, but after an unknown accident she would end up losing her memory and being kidnapped, until Jonathan removed her from prison. Under the name of Selene, he developed a powerful bond with Jonathan following his first encounter and was an indispensable ally for him until the events of Yellow Butterflies. After recovering his memories, he decides to defect to return to his former organization.

Appearance:

She is a light-skinned, thin-skinned girl; she is not very tall; dark hair like night with blue locks, short and straight; her eyes are blue.

Height: 1.54 m

Age: 18 years

Ethnicity: Asian