I noticed that there were five asteroids listed on WikiMoon's Solar System Article: Ceres, Juno, Vesta, Pallas and Chiron. The first four asteroids we know have Sailor Guardians - the Sailor Quartet. The fifth and final asteroid, Chiron, has some connection to Naru's friend Rui Saionji: in the Sailor Moon anime, Nephrite learned it was "controlling the energy" of Rui Saionji. But is it possible that there is more of a connection between Chiron and Rui Saionji? Like latent Sailor Chiron level of connection?
(I know the answer is probably no, but it's interesting to think about. If its true, then there must be something about Naru to be able to find and befriend two Sailor Guardians)