Crimson Rubeus

紅のルベウス

Crimson Rubeus (known simply as Rubeus in the English dub) is the first member of the Black Moon Clan to appear in the 20th century. He is tasked with locating a person codenamed "Rabbit", who had fled into the Tokyo of the past. In addition to following the orders of Prince Demand and Wiseman, he commands his own group of minions (the Ayakashi Sisters).
In the anime, he is primarily the love interest of Cooan, the youngest of the sisters, although most of the sisters are in love with him; only the eldest, Petz, lacks feelings for him. After the Sisters have been healed, while attempting to take Chibiusa, Rubeus kidnaps the Sailor Senshi and blackmails Sailor Moon into bringing the Silver Crystal in exchange for her friends. Sailor Moon arrives to rescue them, and Rubeus takes her and Chibiusa (who had secretly followed Sailor Moon) aboard his spaceship. Onboard, a battle ensues over the custody of the Sailor Senshi. Chibiusa eventually finds and destroys the crystal that controls his spaceship, causing it to malfunction and catch fire. After Sailor Moon attacks Rubeus, the Sailor Senshi are freed, and they, along with Chibiusa and Sailor Moon, teleport away, leaving Rubeus on his burning ship. Rubeus is then confronted by Esmeraude, and begs her to take him back to the future. Esmeraude refuses, and leaves Rubeus in the unstable spaceship, stating he has failed too many times to be of any further use; ultimately, his obsession with killing Chibiusa proves to be his downfall. The spaceship finally explodes, and Rubeus dies.
In the manga, he kidnaps Sailor Mars, Sailor Mercury, and Sailor Jupiter but fails to capture Sailor Venus. He is extremely loyal to Prince Demand, appearing with him to taunt the captured Sailor Moon. He realizes that there is more to Wiseman than what appears, and he is killed by Wiseman when he confronts him.