Since these villains don't really belong in the Main Negaverse People group, they get their own page. Here goes nothing.
Alan and Ann
Alan and Ann are two aliens that showed up in the first half of Sailor Moon R. They disguised themselves as students at Crossroads Junior High, pretending to be brother and sister. Then, they tired to use monsters called Carians to get people's energy, which they then planned to use to energize the Doom Tree, which appears to be the facet of their exsistence. Alan has a flute that he plays that seems to have something to do with the scheme.
The Negamoon Family
After the whole Alan and Ann thing, the Negamoon family showed up (gradually) to plague the inner scouts' lives even further in the second half of Sailor Moon R. They happened to have a bunch of droids at their command, and they're more "mysterious and ooky" as the Adaams Family.
---More info to come---
Death Busters
The Death Busters are some of the major villains in Sailor Moon S. I really don't know much about them, except that they come from another dimension and their lives depend on something called the Taiorion Crystal. I think Master Pharaoh 90 is their master villain.
--More info to come--
The Witches 5
These are five sisters who are witches. One of them is named Cyprine and she is at Level 999 in the Advanced Sorcery class at Infinity College. This is all I really know right now.
--More info to come--
Professor Soichi Tomoe
Professor Soichi Tomoe is a scientist whose life's work is super beings. He was fired from Infinty College after publishing some questionable literature on bizarre genetic experiments. He sold his soul to an evil mass named Master Pharaoh 90 in order to save his daughter Hotaru's life when there was a fire at his lab. (She was later possessed by Mistress 9. However, she was able to cast Mistress 9 out forever, and was reborn as a good scout.)