Although apparently serious in his mannerisms and courteous to those who he does not consider his enemies, he can be judged as a cold-blooded murderer after he explains his murdering of previous Loyard leader. He commented upon the Loyard leader's last plea to him to restrain from killing humans as 'pathetic'. (he did so in order to provoke Seira into reckless action but failed) He uses respectable tone during his conversation with KSA unlike 5th. He also seems to have his own sense of pride as he does not approve of interferences in battles as he initially lost interest in fighting Seira after the 8th interference and also was unsettled by the 5th elders desire to interfere in Rajak and the 8th elders battle.
Zarga Siriana, the previous clan leader of the Siriana Clan, is one of the traitors from the aged Lukedonian history. 820 years ago he, alongside the other five clan leaders had betrayed Rai and caused his long slumber. Not only did they try to kill him, but they also somehow used his name during their betrayal 500 years ago, causing Raskreia to believe him to be a traitor as well. According to his own words, he had murdered the previous Loyard clan leader, father of Seira J. Loyard. He joined as the 7th Elder of the Union and after the deaths of Rostere and Muar, he was sent alongside the 5th and 8th Elders to declare war against the Nobles of Lukedonia. It is revealed that his reason for the betrayal was that his values changed over time and conflicted against that of Lukedonia's nobles.
The deaths of Rostere and Muar in South Korea result in the declaration of war by the Union which sends 5th Elder, 7th Elder and 8th Elder to pass judgment on all involved. They meet the KSA Director and Zarga steps in to stop the 5th and 8th to cause unnecessary ruckus, coldly warning the director to prepare for handling public situations as a massive battle will be underway shortly. Then the 5th creates a havoc in city to call out the nobles. Seira arrives there alone while Frankenstein and others hurry to reach the scene (from their training camp).
Upon seeing the silver hair, the 7th Elder assumes that she's the Loyard Clan Leader and introduces himself as Zarga Siriana, former Lukedonia Clan Leader and the man who had murdered her father. He further taunts her by saying that he remembers her father's final moments begging him to spare human lives and how pathetic he thought it was. The normally calm, composed Seira replies to his words by blowing the top of a building off. They engage in a duel.
Zarga clearly proves to have the upper hand in contrary to the inexperienced Seira (compared to Zarga). He compliments her on being skillful for her age but still acknowledges her as the weakest clan leader in history. At this provocation, Seira launches the Grim Reaper attack which he counters by drawing out his own Soul Weapon. Seira is quickly overwhelmed and for the interference of 8th Elder, Zarga manages to land a vicious slash on her left shoulder.
Interference of the 8th Elder makes Zarga decide to leave the battle but he changes his mind when Seira offends him by calling him a dishonorable traitor. Zarga again taunts Seira but she tries not to lose her temper (which she learned from Frankenstein's training sessions). The fight resumes and despite Seira's growing skills, Zarga prevails in terms of sheer skill and power with his soul weapon. Seira barely stands as Zarga allows the 8th elder to attack her.
When the smoke clears, standing there holding Seira's unconscious form and looking supremely pissed off is Frankenstein. Zarga recognizes him instantly. Zarga is surprised that Frankenstein is alive after all those years. He is further surprised after learning that he is on Lukedonia's side. Zarga remarks that Frankenstein was always arrogant and insolent, and that hasn't changed as he has come alone to fight three Elders. Frankenstein taunts them by saying what they are talking about. Rajak Kertia makes a surprise entry, attacking the 8th Elder with his superior speed.
Zarga recognizes this as the Kertia Clan Leader technique. Zarga begins to mention to Rajak on how similar he is to Ragar, however, he is quickly dismissed by him as he does not desire to converse with a traitor.
Zarga spends most of his time observing the battle of the 8th elder and Rajak. He reveals his observations on Rajak's incomplete soul weapon and the explanation of how a soul weapon works for its user. When the 8th elder begins to fall behind in the battle with no signs of victory, the 5th elder states that they will have to do intervene in the battle because they cannot afford to let the 8th die. This bothers Zarga but their conversation is cut short as they are left dumb founded when they notice Frankenstein has stepped in the battle before them and threw his Dark Spear pining the 8th elder.
At this point, the 5th elder and Frankenstein begin their battle while Zarga stands and observes the match complimenting Frankenstein's ability to fight on par with the 5th elder. After Urokai arrives, Zarga simply continues to watch the events from the distance.
The Earnest Wish
When Frankenstein goes berserk, he launches an attack on both Zarga and Urokai which prompts them to step into the battle with him. As Frankenstein begins to attack Urokai, Zarga attempts to behead him with his soul weapon, however, it is blocked by Rajak who scorns him at his lack of pride by attacking someone in the middle of a battle.
Zarga and Rajak begin to battle while Urokai and the 5th elder deal with Frankenstein. During the battle, Rajak is at a disadvantage and is also distracted a couple of times by the other fights which leads him to take damage from Zarga. At this. Zarga comments on how foolish he is for not paying attention in their fight and how he pities Ragar for leaving the Kertia clan in his hands.
After Urokai attempts to finish off Frankenstein, Rajak and Seira with an energy attack, the smoke clears from the aftermath to show that Rai has blocked the attack, protecting his friends. Zarga is extremely shocked at seeing Rai appear.
Surprised to find Rai alive after so long a period of time, both Zarga and Urokai greet him and wonder if he wants to know why they had betrayed him. However, Rai declares that he respects their decisions. This statement drives Urokai in a frenzy, thinking that Rai has never cared for them while Zarga politely apologizes for the unforgivable act they are about to commit. Bringing out their soul weapons, Zarga and Urokai make a joint attack on Rai. However, Rai outmatches them and sentences them to forced eternal sleep.
After Urokai's departure, as his own body starts to disintegrate into blood crystals, Zarga recounts that he found his ideals had changed from that of Lukedonia and that was his reason of betrayal. But he realizes that he was wrong and asks for Rai's forgiveness, thanking him for stopping him from continuing further as he fully disintegrates into thin air.
This is a flashback arc where the incidents from hundred years back are unfold. It was shortly after Frankenstein had started residing with Raizel in Lukedonia. Zarga was one of the six clan leaders who used to visit the Noblesse rather often compared to the others. Their visits became more frequent after the arrival of the infamous human.
Zarga accompanied Roctis and Urokai in their visit to Raizel's mansion when Frankenstein had been away to meet their Lord (the previous Lord). They were reproached by Raizel's irritation at their random visits but relieved when Raizel revealed that he knew it was because of the human and promised to be cautious of the latter.
Then the three clan leaders confronted Frankenstein who was on his way back to the mansion. Zarga stood an audience as words were exchanged between his fellow clan leaders and the human. The latter's revelation on how he suspected the six clan leaders who showed undue concern for the Noblesse, left them quite worried.
Zarga joined his fellow clan leaders in the meeting regarding their foreboding nemesis: Frankenstein. Both he and Roctis agreed on the fact that Urokai was becoming too much agitated. They were joined by Lagus Tradio who had done some research on Frankenstein prior to the later's arrival in Lukedonia. Zarga informed him how the human had suspected them just for visiting Raizel often. This posed Frankenstein as an obvious threat to their plan. Lagus proposed a way to use Frankenstein's sudden outbursts against him and conjured an item that would drive the powerful human into frenzy. All of them agreed to the plan with Urokai volunteering on the lead act.
As a former clan leader, Zarga's power is quite high in the nobles power structure. He is able to overpower Seira J. Loyard with his Soul Weapon & according to him he killed the the previous Loyard Clan Leader. He is also shown to have an advantage against Rajak (albeit Rajak was distressed during their battle because of his desire to assist Frankenstein and later Seira).
Zarga's Soul Weapon is a variant of a manriki chain. The weapon has a very long gilded chain with an enormous, ornate, double-edged blade at the end. It functions as a long distance weapon. Zarga mainly uses the blade of his Soul Weapon for offensive measures and the chain of the weapon for more defensive maneuvers. It is extremely flexible and the chain appears to be able to extend hundreds of feet when required. Zarga can move the weapon at extremely high speeds (possibly hypersonic). The weapon moves so fast that even the Rajak Kertia was overwhelmed.
Hydra/Dragon: Urokai and Zarga's unique energy beam which is first seen used against Rai. Zarga and Urokai release a massive amount of stored up aura energy from their Soul Weapons, and create an enormous creature that seems to be a cross between a traditional Chinese dragon and the Greek Hydra. It has a long serpentine body, similar to an oriental dragon, however, it has multiple serpents protruding from its mane. The creature's size dwarfs hundreds of city blocks. The energy beast flies toward the target, and collides into its enemy with jaws open wide, with the force of several large bombs.