Hotaru Tomoe &

Hotaru lived with her father when she was young. Her mother had died when she was really little. One day, there was a large explosion at her father's lab, which killed Hotaru. Pharoah 90 told Professor Tomoe he would give Hotaru's life back if he gave his body over to him. Professor Tomoe agreed in order to save his daughter.

Hotaru is a very shy, week girl. Hotaru has a very lonely life, with no friends. She lives with her father, Professor Tomoe, and Kaolinite, who is a housekeeper. Hotaru attends Mugen Gakuen in 6th grade. Hotaru cannot participate in any athletic activities, because she gets exhausted easily. She has a strange power to heal things, but if Hotaru uses it, she gets exhausted.

We first meet Hotaru in the Sailor Moon S season episode 112. She is sitting in a part, reading, when a girl yells for her hat. Hotaru looks up and sees a hat blown away by the wind, and a small girl chasing after it. She runs, and catches the hat for Chibi-usa. Chibi-usa thanks Hotaru for catching her hat. They are both attacked by a youma, and Chibi-usa stands in front of Hotaru to protect her. After the fight, Chibi-usa has a scraped knee and Hotaru heals it for her. She tells Chibi-usa that she has had a power to heal ever since she can remember, but most people get scared of her because of it. Chibi-usa tells Hotaru that she thinks it's cool, and they become good friends.

When the Outer Senshi find out Hotaru is a Messiah, they try to kill her. They say if they don't kill Hotaru, the Messiah will awaken, and destroy the world. The Outer Senshi tell the Inner Senshi to stay away from Hotaru, and to keep Chibi-usa away. But, Chibi-usa trusts Hotaru and protects her from Neptune, Uranus, and Pluto. Chibi-usa goes to Hotaru's house one day, and Kaolinite kidnaps Chibi-usa. The Senshi are looking for the base of the Death Busters, and when they find it, they see Hotaru sitting in a large chair. Kaolinite is there with Chibi-usa. All of a sudden a hand comes out of Hotaru's mouth and takes Chibi-usa's heart crystal. Hotaru turns into Mistress 9, and she wants the Holy Grail from Sailor Moon. Sailor Moon, thinking Mistress 9 is still Hotaru, gives Mistress 9 the Holy Grail. Mistress 9 calls Pharoah 90 to come and destroy the world, but Hotaru is still fighting inside Mistress 9's body. She thinks of Usagi, Chibi-usa, and her father, and destroys Mistress 9. Since Sailor Moon couldn't transform into Super Sailor Moon, Sailor Saturn goes in to fight Pharaoh 90. After the fight, Hotaru is reborn as a baby.

At the start of the Sailor Stars season, Setsuna takes Hotaru from her father, who is free of Pharoah 90's control. She then lives with Haruka, michiru, and Setsuna. One day, Hotaru starts growing rapidly, and when she reaches a good age, she gets her memories back. Soon she starts fighting as a senshi again.