The Bad Guys
Please note that all of these characters are in the anime, not the manga
Starting with Sailormoon (Bishoujo Senshi Sailor Moon)...
Queen Beryl leader of the Negaverse, she destroyed the Moon Kingdom
Jadeite first of Beryl's minions to terrorize Earth, specifically Tokyo
Nephlyte second of Beryl's minions, he turned good in the end
Zoicite third of Beryl's minions, she was the lover of Malachite
Malachite last of Beryl's minions, he was the lover of Zoicite
Prince Darien of the Negaverse after being captured and brainwashed, Tuxedo Mask turned evil and started to help Queen Beryl find the Rainbow Crystals
Queen Metallia person Beryl gets her orders from, although her name is never mentioned, she is the sinister voice from the mists
Moving on to Sailormoon R (Doom Tree Arc)
Alan alien from the negaverse who came to earth to get energy for the Doom Tree; lover of Anne, had a crush on Serena
Ann alien from the negaverse who came to earth to get energy for the Doom Tree as well; lover of Alan, had a crush on Darien
Cardians monsters used by Alan and Anne to obtain energy for the Doom Tree; their names are not listed because they are minor characters, and besides I don't remember their names
Sailormoon R (Dark Moon Family Arc)
Negamoon Family, also known as the "Dark Moon Family;" they were banished from the Earth by Neo-Queen Serenity
Rubeus first head villian to show up from the 30th century Negamoon; he was killed when his ship self-destructed and Emerald refused to help him
The Four Sisters a bunch of bickering sisters under the charge of Rubeus that later turn good; they are also from the 30th century
Catsy one of the Four Sisters, her hair looks like cats ears
Birdy one of the Four Sisters, she uses ice attacks
Prisma oldest of the Four Sisters, she had a crush on Saphire (also Saffir)
Avery one of the Four Sisters, she uses a whip to attack people
Wiseman mystical sorcerer of the Negamoon family; wants to put everyone under the Doom Phantom's control
Prince Diamond leader of the Negamoon family; in love with Sailor Moon
Emerald Rubeus' replacement- not too bright either
Saphire Prince Diamond's brother; killed by Wiseman when he finds out about the Doom Phantom; has a crush on Emerald
Droids and Droidos just like Cardians only alot more of them; one to note is Droido Hypnotica