Sailor Saturn, civilian name Hotaru Tomoe, is the Guardian of Ruin and Birth, wielding the power of destruction through her Silence Glaive. Orphaned after a lab accident that killed her mother and injured her, she was revived by Professor Tomoe with alien influence, becoming Mistress 9's host. Despite her frail body and dark fate as the Messiah of Silence, Hotaru possesses a gentle soul, forming deep bonds with the Outer Senshi—Sailor Uranus, Neptune, and Pluto—who act as her guardians. She attends Mugen Academy and transforms into Super Sailor Saturn in dire battles, capable of annihilating worlds but restrained by her compassion. Her arc explores themes of death, rebirth, and hope.