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Rubeus is an alien from Nemesis. Like Esmeraude, Saphir, Prince Demande, and the rest of the Black Moon Clan, he has a crescent moon symbol on his forehead. He has the power to fly, teleport and shoot powerful beams and bursts of dark energy. He is the leader of the Spectre Sisters. Unknown to them, he is just using them as pawns to do his work and has no concern for them but ironically, he ends being a pawn himself.
Rubeus is a man with bright red hair, styled to look like a flame, and red eyes, and he has the black, upside-down crescent moon on his forehead. For clothes, he wears a brown leather vest, pants with a camouflage-like design, black leather boots with laces, and a necklace with a stone pendant on it, and the evil black crystal earrings. The Materials' Collection describes that his skin is a bit darker than Saphir's or Demande's. He is also seen carrying a jacket with the same camouflage-like design as his pants, but he is never seen wearing the jacket.
In the manga, he kidnaps Sailor Mars, Sailor Mercury, and Sailor Jupiter but fails to capture Sailor Venus in after he was defeated by Sailor Moon and Tuxedo Mask. He is loyal to Prince Demande, appearing with him to taunt the captured Sailor Moon. He realizes that there is more to Wiseman than what he sees and he is killed by Wiseman when he confronts him.
Rubeus almost showed, during his battle against Tuxedo Mask in Act 18, his fire powers, however he was defeated by Tuxedo La Smoking Bomber. He is also able to comunicate telepathically, making Calaveras repeat everything he talks.
- Rubeus’ name does not specifically mean ruby, but the word ruby derives from rubeus, the Latin word for red.