The Witches 5
The witches 5 are all workers for Professor Tomoe; they are trying to obtain heart crystals in order to find the 3 talismans. The witches 5 are members of the Death Busters (in America "Heart Snatchers") and are trying to bring death and silence to the world by means of Master Pharaoh 90.
Eudial
She used a special gun to remove people's heart crystals; she had found the 3 talismans, but was defeated when the Holy Grail ("Rainbow Chalice") got into Sailor Moon's hands. While returning to headquarters, she drove off a cliff and died because Mimete had removed her brakes. Eudial also developed a special gun that shot out fire (her "fire witchy blaster).
Mimete
Mimete wasn't all that bad; she just wanted to impress Professor Tomoe. She would always attack good looking guy-superstars and had a special "stage fright" blaster attack. Mimete used a machine that Eudial had made but was too afraid to use: a machine that placed you inside a computer. However, Tellu pulled the plug and Mimete was gone forever.
Tellu
Tellu was plant themed; she had special flowers she massproduced that stole people's heart crystals. Tellu was very successful until her own plant monster attacked her instead of Sailor Moon. In the dub, they have some strange name like "Teru" for her.
Viluy
Viluy posed as a student at Mugen School and was computer themed. Viluy was very close to destroying the sailor scouts and collecting all the heart crystals of Mugen school, but was killed when her own computer virus attack short circuited and attacked her. Once again, the dub screws up another name with Viluy, changing it to "Veruli" or something like that.
Cyprine/Ptilol
Cyprine and Ptilol were twins that posessed 2 bodies, but one mind. Together, they were invincible. But, the inner senshi managed to split them up and trick them into destroying each other.