Yin (Darker than Black)

Yin, formerly known as Kirsi, is the main female protagonist from the Darker than Black anime.

Yin is a "doll", an emotionless spirit medium and serves as Hei's team's recon unit and is part of the Syndicate.

Appearance
Yin is an adult young woman with the silver hair color. She wears a long black t-shirt and a navy blue skirt.

Personality
Throughout the course of the series, Yin begins to display emotions and her own will, deciding to follow Hei and remain to be his partner, and even observes and notices a change in his behavior, despite not being ordered to do so. This has been made apparent when she called Hei from the void to come back to her and not leave her alone. In the process, her observation apparition evolved or upgraded, now having a human-like body shaped with her silhouette and is capable of physical touch.

It is implied that Yin has feelings for Hei.

Abilities
Her power lies in tracking and observation by way of water. However, this power only takes effect when she is in direct contact with water. Huang mentions that her "program" is a minimal one, incapable of showing emotion or even allowing her to make decisions for herself, though, she later debunks this by making the decision to keep working with Hei and the others when given the choice of leaving.

Trivia

 * Yin is of Finnish origin and her real name is Kirsi, which is the Finnish diminutive form of either Kirsikka (meaning "cherry") or Christina. She was once a student of a famed Finnish pianist by the name of Eelis Kastinen (or Kostinen depending on translation, both are Finnish surnames).