Hotaru Tomoe is a young girl who becomes the powerful Sailor Saturn, the Senshi of Ruin and Rebirth. In Japanese mythology, the firefly are thought to be the souls of soldiers who have died in war. When she was first introduced, she was possessed by Mistress 9. She is later adopted by Sailor Neptune, Sailor Uranus, and Sailor Pluto. Her best friend is Chibi-Usa. Hotaru is the only Sailor Soldier to not receive a name change in the English anime. She is also the youngest Sailor Scout, with the exception of Rini.
Her name means 'Firefly Sprouting from the Earth'.
In the manga, Hotaru's mother died in a laboratory fire. Hotaru was only a small child at the time, and was severely injured. Her scientist father integrated technology into her body, and made her into a cyborg. The machine additions to her arms and legs were clearly visible, so Hotaru made a necessary habit of wearing long sleeves and tights with every outfit.
In the anime, Hotaru and her father were severely hurt in a laboratory explosion, Holding the near-death Hotaru in his arms, Doctor Tomoe made a deal with a monster to save her life, allowing the monster to possess him and Mistress 9 to possess Hotaru. Because of this, Hotaru grew up very frail and weak and was prone to getting sick and losing energy quite often. Upon meeting Chibi-Usa, she drew the suspicion of Sailor Uranus and Sailor Neptune, whose suspicions turned to fear upon discovering that she carried the spirit of Sailor Saturn, the Senshi of Death. They did not realize though that Mistress 9 was also inside her. Once Mistress 9 was awakened by Chibi-usas Pure Heart Crystal Hotaru fights to hold on so Mistress 9 doesn't get complete control. Eventually Hotarus body rejects Mistress 9 and Sailor Saturn is awakened. She then returns Chibi-Usas heart crystal and thanks Sailor Moon for protecting her. She attempts to destroy Pharaoh 90 with Death Reborn Revolution, but Sailor Moon stops her with her Pure Heart and the power of the other Senshi, destroying Pharaoh 90 and allowing Hotaru to be reborn as a baby. Hotaru is then returned to her Father once he is feeling better, he was put in the hospital for his wounds and for amnesia of the past several years when he was working for the Death Busters.
Hotaru is seen again at the beginning of the Stars series of Sailor Moon as an infant recovered from her Father by Sailor Pluto. She is attacked by a new enemy and reawakened. She then begins to grow at an alarming rate as well as learning things well beyond even her apparent age. After she is awakened as Sailor Saturn and joins the fight against Nehelenia, Galaxia and the Sailor Animates.
Sailor Saturn wields the Silence Glaive (called the Silence Scythe in the english dub), just like the other Outer Senshi, who each carry a weapon. Her attacks are based on death and silence for main characters as Tatsunoko vs. Capcom: Ultimate All-Stars.
As princess saturn she dwelt in castle Titan, and wore a purple gown.
Sailor Saturn is proved to be the strongest Sailor Senshi in the series, as the bringer of Death and Rebirth. She is strong enough to defend against even Galaxia, one of the most powerful characters in the series.
Death Reborn Revolution: Used in the manga to drain Pharaoh 90's energy and power.
'Dropping the Silence Glaive': Utilized in the manga to destroy the world, which results in Pharaoh 90 trying to flee back to Tau Ceti.
Super Sailor Saturn
Silence Glaive Surprise: Was only used once, to try and destroy Nehelenia, but was stopped before it could finish by Chibiusa, while in the manga it creates a disorientating fog bank, similar to Mercury's Shabon Spray.
Silent Wall: Was first used to defend Chibiusa from Nehelenia. She uses it later on to defend the Sailor Senshi from Galaxia's Attacks.
Sailor Saturn is the only one of the nine Sailor Soldiers whose transformation sequence is never shown in the anime. A transformation sequence was created and appeared in one of the Sailor Moon video games on the Sega Genesis (the game was only released in Japan).