- Gender: Female
- Age: 11 (as of Hybrid Theory; 13 when we saw her in Sailor Moon)
- Hair: Black
- Eyes: Purple
- Nationality: Japanese/Tao Nebula
- From the anime Sailor Moon, property of Toei Animation Co.
- First Appearance: Chapter 14
Hotaru Tomoe is the young daughter of famed genetic researcher Souichi Tomoe. She attends her father’s exclusive private school, Mugen Academy. And while she does not remember it, she was also involved in the horrible lab accident two years ago that left both of them implanted with daimon eggs, the children of the Chthonic world-destroying entity Pharoah 90.
Unlike her father, whom she does not know anything has happened to, Hotaru retains her own personality much of the time and knows nothing concrete of the evil that sleeps within her. She is also unaware that she is in fact the reincarnation of Sailor Saturn, arguably the most powerful, and certainly the most destructive, of the Sailor Senshi. As Sailor Saturn, with her talisman, the Silence Glaive, she has the power to destroy entire worlds. However, this power has not yet manifested within her. Hotaru knows, however, that something makes her sickly, and occasionally causes her to black out. When she awakens from these periods, she often finds she has hurt those near here, which has led to her being ostracised from anyone who could be her friend. Less sinister is the one supernatural ability she knows she possesses: the ability to heal injuries of others. The exact source and limitations of this power and never defined in the series.
Hotaru is, despite all this, a good-natured and charitable child who goes out of her way to help others despite her physical frailty. She blames herself for the violent incidents that have occurred to her, and often believes she deserves whatever happens to her as a result, but nonetheless is still quite lonely and strongly desires to have friends. She idolises people who excel physically despite handicaps, and hopes to emulate them when her father is finally able to cure her lingering illness. Despite her kind nature, Hotaru tends to be timid, shy, and reserved.
The entity possessing Hotaru is named Mistress 9. On the occasions it manages to possess Hotaru’s body for a brief time, it lashes out at those around it, seeming to take specific pleasure in attacking Hotaru holds dear. It is still quite weak and seemingly has no supernatural abilities to call on, but is slowly gaining strength and influence over Hotaru. Mistress 9 is a complete separate personality: arrogant, cold-blooded, opportunistic and ruthless. She is also completely aware of, and utterly dedicated to, the goal of brining Pharoah 90 to Earth.