Weiss Weiss the Immaculate is a member of the Tsviets and the secondary antagonist of " Dirge of Cerberus - Final Fantasy VII - " . A mysterious SOLDIER who commands Deepground , Weiss declared a hunt on the world three years after the Meteor crisis . He received the title of emperor , as he is the strongest Tsviet , as well as the first member . Deepground soldiers fear his power and follow him ; however , it is said they rarely see him directly . He has a deep bond with his younger brother , Nero the Sable . Profile . Appearance . Weiss is tall with a muscular build and shoulder - length , spiky white hair , which sticks up in all directions and partially covers his face . His eyes are blue with yellow rings around the pupils . His upper body is bare and wears white pants tied with a black sash similar in appearance to a karate uniform , and knee - high boots . His Omega form adds a metal skirt resembling Samurai armor . Weiss often sports a broad smile during battle or when he gets excited . Weiss wields a pair of sword revolvers forged by Argento . Though only officially referred to as " Weiss ' s weapons " , they are identified by the emblems on their hilts : Heaven on the one carried in his right hand , and Earth on the one carried in his left . Sometimes referred to as gunblades by fans , Weiss ' s weapons are more accurately compared to various real world s that attempted to combine firearms with edged weapons . In the " Final Fantasy VII 10th Anniversary Ultimania " , the weapons are described as , " a set [ of weapons ] that combine a revolver - type gun and a katana , with the reload action pictured in the concept art " . When fighting against Omega Weiss , he uses different swords , a pair of long katanas similar in design to Sephiroth ' s Masamune . Personality . Much of his personality traits may have been affected by being under Professor Hojo ' s control , but Weiss harbors a sincere hatred for humans , much like the others Tsviets , and is particularly scornful towards scientists . Weiss can be described as calm , charismatic , and confident . These traits , combined with his leadership skills , make Weiss persuasive . He displays psychopathic traits and cares little for the well - being of his subordinates , even delighting in their deaths as much as those of his enemies . He is arrogant , brash , reckless , sadistic , and perceives people to be only as useful as they can further his agenda . He is , however , affectionate towards his younger brother , Nero , whom Weiss describes as " the only person who ever loved him " . Story . " Crisis Core - Final Fantasy VII - " . Weiss and Nero appear soon after Zack Fair defeats Genesis Rhapsodos . They are wearing SOLDIER First Class uniforms with the Deepground SOLDIER crest . Weiss and Nero take Genesis ' s body away in a helicopter . Though previously unacquainted with Genesis , Weiss and Nero were aware that they , along with the other colored Tsviets , were spliced with his genes . In the " Crisis Core Ultimania " it is revealed Genesis was alive when he was recovered by Weiss and Nero , and there was an attempt to persuade him to join the rebellion against the Restrictors . Genesis rejects the offer to regain his SOLDIER honor , and seals himself in a cavern below Midgar . " Dirge of Cerberus - Final Fantasy VII - " . During the events of the online multiplayer mode on " Dirge of Cerberus " , Weiss is restrained by chains attached to his throne inside Mako Reactor 0 . He tells the Restrictor he would like to try out his new swords . After the Restrictor breaks the chains , Weiss takes hold of his swords and tells him he wanted to fight him handicapped as he is confident he is the more powerful one . The Restrictor calls forth Azul the Cerulean and Rosso the Crimson and tells Weiss that if he wants to fight handicapped , he can ; against Azul and Rosso . Weiss beats them both easily , but Azul transforms into Arch Azul and Rosso into Bloodburst Rosso . Still , Weiss proves to be more than a match for the two Tsviets . Unable to attack the Restrictor , Weiss orders the player to shoot him . The Restrictor is defeated by the player but forces his gunblade into the player ' s stomach and watches as they drop to the floor . Weiss takes the opportunity to attack and executes the Restrictor knowing that along with the Restrictor ' s death comes the release of a virus within his body , a defense mechanism designed to deter Weiss from attacking the Restrictors . As the dying Restrictor explains this to Weiss , Weiss retorts that it was he who said that death is always with you as long as you are a part of Deepground , and Weiss and the Tsviets laugh at the Restrictor ' s demise . At the time of the Kalm revival festival , the Worldwide Network that was broken since the Meteor disaster had been restored . The fragments of Professor Hojo ' s digitized mind that were previously spread were about to reform . Hojo invades Weiss ' s body while he was performing a Synaptic Net Dive to find the cure to the time - released virus the Restrictors infected him with . The virus was meant to control him and ultimately kill him within three days if the Restrictors ' signal disappeared . Hojo , through Weiss , had Deepground abduct those not under the effects of Geostigma to serve as incubators of pure Mako . Hojo would need purity to enable Weiss to summon and absorb Omega . This grants Weiss superhuman strength , speed and endurance and he is easily able to overcome his adversary , Vincent Valentine . Vincent turns the tables by embracing Chaos ' s power , leading to Weiss ' s initial defeat . Once Weiss is defeated , Nero , who had been watching , attempts to merge with his brother . Hojo orders Nero to stop , knowing he would not be able to control Omega with an impure being inside him . Neither Weiss nor Nero care , and Hojo is finally destroyed as Nero joins with Weiss . Weiss invokes Omega ' s power by a sense of compulsion and vanishes in a ball of light . Weiss is later , supposedly , defeated by Vincent in Chaos ' s form , but Weiss ' s body is carried off by an awakened Genesis , who tells his " brother " that they " still have much work to do " . Gameplay . Weiss is fought as a boss twice at the end of Chapter 11 . At first he cannot be killed , as it is extremely difficult to hit him and any hits do not affect his health , so the player must lose . He is fought again in a regular battle once Vincent has been augmented by Chaos . Weiss then comes back fused with the Omega as the game ' s final boss , Omega Weiss . Voice . Weiss is voiced by David Boat in the English version and Jouji Nakata in the Japanese version . Other appearances . " Final Fantasy Trading Card Game " . Weiss appears in the " Final Fantasy Trading Card Game " with an ice - elemental card . His card depicts his official render . Etymology and symbolism . This shows the relationship between Weiss and his brother Nero ( which is Italian for " black " ) . His subtitle , Immaculate , refers to pure whiteness and is derived from the Roman Catholic belief of the Immaculate Conception where the Virgin Mary became pregnant through divine intervention . This meant imperfection and sin were not passed on to the child , similar to how Weiss was created to be untainted from the Lifestream .