Rubeus

Manga: Rubeus is a servant of Wiseman, from the Dark Moon. "
Crimson Rubeus is more or less in control of the Four Sisters, and after each of them are successively killed, he takes the captured Sailor Senshi to Nemesis, where they are placed in a dungeon as bait for Sailormoon. Rubeus is directly involved in Calaveras' plot, having his spirit channeled into her body; through her, he announces to the world that the Black Moon has come to lead the Earth to the correct path. Rubeus always seems very sly and collected, telling Safir not to arouse Demando's anger, then calling attention to Esmeraude's spying on Demando. However, in Act 20 after Sailormoon starts wrecking havoc on Nemesis trying to find her friends, the castle starts to collapse, and Rubeus decides to escape. Wiseman catches him, and Rubeus sees the outlines of Black Lady, then demands to know what Wiseman is really up to. Wiseman responds by using his black hands to kill Rubeus." Thanks to SSP for the previous paragraph of information. (SSP)
Anime: Rubeus is the head of the Dark Moon family, and takes orders from wiseman. He is the leader of the Four sisters, and his duty is to secure the Cystal Points of Tokyo. After an encounter with Sailor Moon and Chibi-Usa on his UFO, he's killed with his UFO, after it explodes.
Name origin: Rubeus is based on the gem, Ruby.