Sailor Pluto or Setsuna [Or christened Susan by American fans] is the only of the Sailor Senshi to not be a reincarnation. She is also the only one to not have sleeves on her uniform. Sailor Pluto guards the doors of time and space. Funny really. Pluto was actually the god of death and ruler of the realm of hell. Setsuna knows all that will happen in the future and all that has happened in the past. But she also has a strong sense of timeline and will not interfere. She was in one of the final episodes of "Sailor Moon R" and attacked Sailor Moon [Go for the kill!] but then realised who she was attacking and stopped [damn]. It was said that she must be the loneliest of the Senshi, standing guard over the gates of time until time itself is no longer.

Hotoru is the Sailor Senshi for the planet of Saturn. You know which one that is, the big one with the pretty rings. Yeah! That's it! Now, Saturn was Jupiter's Dad. [Yes, we are talking mythology now.] His Greek counterpart was known as Chronos, which - we should be able to work out - is pertaining to time. Chronos was told that on of his children would kill him and take over his kingdom, so he used to swallow his children. But his wife made him swallow a rock instead of Zeus, and Zeus came back when he was older and kicked the shit out of Chronos. Hotoru's Dad was a scientist who killed Hotoru in an accident. He sold his soul to Mistress 9 to bring her back to life. But then Mistress 9 possessed Hotoru. [Thanks, Dad]