The Dwarf Planet Senshi

Well okay, not all the (famous, named) ones...'cos some of them are named after male deities and the Sailor Senshi Maker at Doll Divine doesn't have as many customisation options for males!    Anyway, from left to right...

--You already know Sailor Pluto, of course (YOU'RE STILL THE NINTH PLANET IN _MY_ HEART, PLUTO!)

--Eris, named after the Greek goddess of dischord.  Notice the scheming look on her face and the Greco/Roman touches to her outfit.  Also, the only one with a weapon.

--Haumea, after the Hawaiian goddess of childbirth and fertility; she's wearing flowers, leaves and jewelry.

--Sedna, the Inuit goddess of the ocean.  Wearing a longer dress than the others, tights under patterned with snowflakes, fur trim and earmuffs.  'Cos it gets COLD out there!

And in the background--faded and blurry--sad Ceres, harvest goddess of The Planet That Never Was. 
(Although, this being the Sailor Moon universe, I'm betting that at some point in THEIR timeline there was a full planet there with a civilization, and one day they accidentally blew themselves up with their own weapons of mass destruction.  Or something.)