The Asteroid Senshi
The Asteroid senshi, in the manga, were previously the Amazoness Quartet, villians under Neherenia in Sailormoon Super S. At the end, when Neherenia's mirror was destroyed, they were revealed to be manipulated and tricked by Neherenia: Sailorsaturn coaxed Sailormoon to turn them into Sailor Soldiers. They became the gaurdians of the princess of the 30th century: Chibi Usa. They went with her back to Crystal Tokyo at the end of SuperS, and reappeared at the end of Sailormoon Stars, using their attack 'Amazoness Jungle Arrow' to fight Sailor Galaxia. To the left is a picture of them as sailor soldiers, and pictures of them as villians from the anime are below (In the end of the anime, Sailormoon transformed them into normal girls, not sailor soldiers).
CereCere, who was transformed into Sailorceres.
VesVes, who was transformed into Sailorvesta.
JunJun, who was transformed into Sailorjuno.
ParaPara, who was transformed into Sailorpallas.
They were named for the four the four largest asteroids in the asteroid belt.
The Amazoness Quartet usually attack their victims using their balls (orbs they possess). 'Crown Ball' and 'Palaquin Ball' are both attacks, 'Summon Ball' is sued to summon lemures (the MotD's), and 'Opposite Ball' was used by ParaPara to switch Usagi and Chibiusa's ages. I have read that only Parapara uses these attacks, but I do not know for sure.
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Sailormoon belongs to Naoko Takeuchi. This page is mine. The pictures belong to the Amazoness Quartet. Use them w/o persmission and you will be eaten.
Asteroid Senshi, page 5 of the Senshi Tour: https://members.tripod.com/~saturnchild/sailormoon-Asenshi.html.