U-DO Retro Virus. That's what U.R.T.V. means, biological clones of Dr. Yuriev created in order to battle and destroy the U-DO phenomenon in Xenosaga series. Rubedo (Gaignum Jr.), Albedo, Nigredo (Gaignum) and Citrine are four of those experimental clones and as I love Xenogears/saga plot (probably best in an RPG ever) and characters I always wanted ( Read more... )