Sailor Saturn

Hotaru Tomoe (土萠 ほたる, Tomoe Hotaru) is a sweet and lonely young girl, whose health was compromised following a laboratory accident in her youth. After overcoming the darkness that surrounded her family, she transforms into Sailor Saturn, the Guardian of Silence, Destruction and Rebirth.[6]: 123–211 She is often pensive, and as a human has the power to heal others

She's a magical girl. Magical girls are young women with powers who fight against evil forces.

She is 18 years old, has a slim build and dark purple hair that can be mistaken for black depending on the light.