One of Chounen's first Darkness Lords. As one of the first officially recognized Lords in the region, Rui is quite the prideful person. While he does treat people who get on his good side well, he often develops grudges or outright comes to hate people that possess traits he loathes - namely, that of cowardice. Especially that of teammates or 'friends'. While he might look like a pretty boy (and admittedly feminine, if he HAD to say it aloud), Rui isn't the sort of person to sit down and quietly listen to mockery aimed his way. If anything, he takes quite a lot of joy fooling such people into believing he's harmless, then choking the life out of them with his signature Black Steel move. He also possesses a green malachite saber, and a chained whip. While he can use lances, he doesn't normally carry them on him.
In the role-play, Rui searches for the fabled relic weapon, Gungnir, said to be able to restrain even the toughest of foes underneath its power. Having suffered many defeats and blows to his pride in the past, Rui seeks this mystical trident out in order to exact his revenge on those who got in his way.
While not the most sympathetic of characters (in fact, he's one of the more sadistic and nutty of the lot), Rui IS capable of affection and loyalty towards others. In particular, he absolutely won't lay a hand on people who earn his respect (most often by showing their battle prowess). However, those who have garnered his hatred will get the worst of his torture methods without hesitance.
While it was initially believed that he and Kage parted on good terms, Rui holds an intense hatred for Kage due to an incident during their teenage years that netted Rui some sometimes-debilitating chemical scar wounds. Rui is Kage's first Partner, though it was through a drunken incident that Kage obtained the Ice Saber Mark in the first place. Surprisingly, Kage has retained this Mark, hinting to a stronger bond than either of the two realize. As rivals, they're fairly well-matched (which says a lot about Rui's strength as well).
As it might be obvious, Rui is a sadist, though he has masochistic tendencies sometimes too. This serves him well in battle, fortunately, due to his lack of hesitance.
His name translates to Garnet. His last name is Masaomi.
A more recent version of Rui with both his tails and a revamped design to make him stand out more.