setsuna meiou. also known as sailor pluto, she is the solitary guardian of time and revolution and presides over the space-time door, keeping an eye on and preventing intruders from interfering with the endless span of timelines. she is said to be the daughter of the god, chronos, himself and is the eldest of the senshi. considered stalwart and ruthless in the face of perceived threats to space-time, she holds no hesitation in attacking outsiders who approach it. for a long time her existence remained a closely guarded secret, until chibiusa ā in the 30th century ā discovered the room which led to the space-time door within the crystal palace. from then on, sailor pluto became the child's first real friend and the soldier grew very fond of her, often allowing chibiusa to visit her despite the dangers. it is during the black moon clan arc, when crystal tokyo is attacked, that chibiusa steals one of pluto's space-time keys and escapes to the 20th century to find the legendary soldier, sailor moon, in hopes of saving her family. at the end of the arc, amidst the final struggle with the black moon clan, pluto stops time ā committing one of the greatest tabboos ā and dies. in her grief, black lady ( chibiusa, who has been manipulated and brainwashed by the black moon clan ), cries out, awakening as a sailor senshi for the first time. sailor pluto is re-introduced in the infinity arc, reborn as setsuna meiou and is able to live out a normal life as a university student while being a senshi with the others. together, with haruka and michuru, she raises the reborn infant, hotaru, until she reawakens as sailor saturn. she eventually becomes a nurse at chibiusa and hotaru's elementary school.
