Hotaru is an only child, of Professor Tomoe Souichi. She is a very shy, isolated person, yet extremely wealthy. She had no friends at her school, a rich and elite school named Mugen Gakuen. Hotaru has a strange power, which her classmates deem as unnatural and gross, she has the ability to cure wounds. Her classmates were not particularly fond of Hotaru, so she spent most of her time in her father's mansion. Because she has this power to cure, her body is weak, and easily exhausted. Hotaru also has a special power to destroy, in addition to her powers to heal. As Sailor Saturn, she is not her normal, well-spirited self. She wields the fearsome pole-arm known as the Silence Glaive. She can use the weapon to slice through anything that gets in her way. Hotaru is also the Silent Messiah who sits on a throne surrounded by dolls AKA Mistress 9. Sailor Saturn possessed such awesome destructive power that her awakening was feared by Sailor Uranus, Sailor Neptune, and Sailor Pluto, but using these powers to their full extent would bring about her death. Nevertheless, she played a pivotal role in the defeat of the Death Busters, and later became a regular associate of the other Solar System Senshi. She was twelve years old in the Sailor Moon S season, reverted to infancy at the end of the season(after sailor moon killed mistress 9), and then in Sailor Moon Sailor Stars grew up again when there was a need for Sailor Saturn's peculiar powers; she was revived and aged rapidly to a stage where she could use them.