Zodiac: Scorpio
Hobby: shopping
Favorite color: dark red
Favorite stone: garnet
Favorite sport: rhythmic gymnastics
Favorite class: Physics
Least favorite class: Music
Favorite food: green tea
Least favorite food: eggplant
Sailor Pluto doesn't show up until the second story arc, and we don't see her civilian form until the third. She's the guardian of the Door of Space-Time—basically the only person allowed to decide who gets to pass through it. Her powers cover both time and the underworld, which makes her pretty unique among the Senshi.
In the anime, she first contacts Chibiusa through Luna-P and becomes her guardian, with Chibiusa calling her "Puu" as a nickname. Pluto refers to the kid as "Small Lady." After the second arc wraps up, she leaves her post to live as a regular human, enrolls as a university physics student, and joins up with the other Outer Senshi. Depending on the version—manga versus anime—she either gets reincarnated by Neo-Queen Serenity or is simply allowed to leave. Either way, Setsuna ends up being the oldest member of the team, probably late teens or beyond.
She comes across as distant and kind of lonely, but she's genuinely warm with Chibiusa. Once she becomes human, she softens up a bit, though she's still pretty reserved—though the manga shows her having more emotional moments than the anime does. Later she helps look after Hotaru along with Michiru and Haruka.
There's real debate about whether Setsuna is actually human at all. She's been called "a goddess, eternally guarding the Portal of Space and Time," which hints at something bigger going on.
Her actual abilities are never pinned down clearly. There's a running theory that she's basically omniscient, especially based on how the anime portrays her—like how she apparently knows what people are carrying but doesn't tell them, letting various people get attacked instead. (The manga handles this completely differently, so it might just be an inconsistency.) The idea is that she can see through the gates of time, giving her that god-like awareness.
Unlike Uranus and Neptune, Pluto actually gets along with the Guardian Senshi. She helps them out during the second arc by letting them travel through time, which isn't normally allowed. Later she's genuinely helpful to Sailor Moon's group even when the other Outer Senshi want them kept at distance. She even teams up with them to figure out who ChibiChibi really is. In the manga, she ends up being someone Ami looks up to, and that connection gives Sailor Mercury the confidence boost she needs to reach her Super form.
The manga version is way darker. Pluto shows up as the "Guardian of the Underworld" with dark skin and a black sailor uniform—basically the opposite of the friendlier anime take. She's described as the daughter of Chronos, the god of time, and plays by brutal rules: anyone who tries to breach the underworld or find the Gates of Time gets eliminated. She nearly kills Sailor Moon before figuring out who she is, flat-out stating that "all who break the taboo must be eliminated." Luna tells everyone that Pluto shouldn't even be known to exist because of what she is, calling her a "lone warrior" with deep sadness in her eyes—someone nobody's supposed to have ever seen.
Content compiled by AnimeList.moe from publicly available sources.
