Rezo the Red Priest : is the main antagonist of the first novel. He is a world-famous cleric and healer who travels the world performing miracles. Considered one of the "Five Great Sages", he has mastered not only clerical white magic, but shamanistic and black magic as well. Rezo is over a century old, but does not look his age; as Lina describes him as looking "both young and old" at the same time. Although he travels the land healing the sick and blind, Rezo is unable to cure his own blindness. So he seeks the philosopher's stone hoping it will boost his power enough to accomplish his wish to actually
see the world. However, upon attaining and swallowing the philosopher's stone, Rezo is revealed to have been taken over by the Dark Lord Shabranigdu from inside. Lina is able to defeat the Dark Lord using the incomplete Giga Slave and the Sword of Light, with help from Rezo's soul, but the priest dies in the process. In the anime, it is later revealed that Rezo survived by transferring his soul, as well as the ghost of Shabranigdu, into the Hellmaster's Jar. Pokota resurrects Rezo in order to revive the people of Taforashia from their suspended state. After reviving the people of Taforashia, Rezo wants to see again, if only for a moment, so he opens his eyes. As the power of Shabranigdu returns to him, he asks Lina to destroy him once more. With the help of the completed Giga Slave, Lina destroys Rezo, and the ghost of Shabranigdu with him.
Halciform the White is the main antagonist of the second novel. He is a sorcerer and chairman of Atlas City's sorcerers' council. Missing for six months by the time Lina and Gourry arrive in the city, a succession battle between vice chairmen
Talim the Purple and Daymia the Blue is occurring. Lina and Gourry find Halciform sealed away in Daymia's house and free him. Unknown to them, Halciform was kidnapping and experimenting on townspeople to obtain immortality. Because he has obtained quasi-immortality by making a contract with Seigram and sealing his soul in a pledge stone, Talim recruited Daymia to seal Halciform away. Now freed, Halciform has Seigram curse Daymia and kills Talim. Lina and Gourry succeed in breaking Halciform's pledge stone and force Seigram to flee. Halciform, who also extended his life by consuming the demon Gio Gaia, is finally killed when , the homunculus he created of the dead woman he loves, uses the Sword of Light on him. Rubia briefly appears in the fifteenth novel, when Lina and company stop in Atlas City.
Seigram : , known as Seigram the Faceless, is a masked demon working for Halciform in the second novel. He confronts Lina and Gourry several times, including leading enemies to fight them, but never engages in battle himself. This is revealed to be due to Halciform making a contract with him, which required Halciform to seal his own soul in a pledge stone that the demon wears as his mask. The risk of the mask breaking and the fact that Halciform will die if Seigram does, is why Halciform has the demon refrain from battle. After Lina and Gourry succeed in breaking the pledge stone and seriously injuring Seigram, the demon flees. He returns in the sixth novel seeking revenge on Lina and Gourry. Still weak from his injuries, Seigram fused with the human
Zuma, who also has a grudge on Lina. Seigram/Zuma is killed by Lina's Ragna Blade. In
Slayers NEXT, Seigram is a servant of Gaav the Demon Dragon King and seemingly as powerful as his rival Xellos. He first appears as a mysterious figure that frames Damia and Tarimu by summoning ooze monsters out of their estates, and he makes an alliance with Halcyform. He later attacks Lina in the temple of the Claire Bible manuscript, revealing that he was granted enough of Gaav's power to withstand a Dragon Slave. He is killed when Xellos holds him directly in the path of Lina's Ragna Blade.
Eris : is a young woman in the third novel who first appears as a novice bounty hunter chasing Zelgadis in Sairaag after Rezo the Red Priest put a bounty on him. Due to her lack of strength, the heroes agree to bring her along with them for her safety. However, Lina eventually deduces that Eris is the real Vrumugun; a sorcerer who confronted the heroes several times previously, despite easily being killed each time. These Vrumuguns were copies she created and controlled. With her full name , she was Rezo's assistant, helping him perform experiments to cure his blindness. Having been in love with Rezo, Eris wants revenge and to make a name for herself, so she has been controlling the homunculus copy that Rezo made of himself and placed very large bounties for the capture of Lina, Gourry and Zelgadis. However, when the copy reveals itself to be self-aware, it kills Eris in revenge for experimenting on it alongside Rezo. In the anime, Vrumugun is partnered with Zangulus, and they try to capture Lina and Gourry. However, while Zangulus is short-tempered and arrogant, Vrumugun is quiet, collected, and takes everything seriously. Eris is killed in cold blood by Copy Rezo after he merges with the ancient Demon Beast Zanaffar that was buried in the Holy Tree Flagoon.
Copy Rezo : is the main antagonist of the third novel. He is a homunculus copy of Rezo the Red Priest, created by the original Rezo as a
lab rat for experiments to cure his blindness. Although Copy Rezo's sight is cured, the real Rezo is unable to make it work on himself, leading to even more experiments on the copy. It was after being fused with a demon, that Copy Rezo gained self-awareness, causing it to seek revenge on the original Rezo. But with the real Rezo dead, the copy must settle for proving his superiority by killing those who did. It pretended to allow Eris to control it in taking over Sairaag and placing the bounties on Lina, Gourry and Zelgadis. Copy Rezo is finally killed when Lina pins him to the Flagoon tree with the Bless Blade, and the tree feeds off his evil energy. In the anime, Copy Rezo orders Eris to lure the three of them to Sairaag, where he attempts to defeat them by resurrecting and absorbing the power of the demon beast Zanaffar. However, Lina, Gourry, and Zelgadis, accompanied by Amelia and Sylphiel, kill him using the Blessed Blade and the power of the tree Flaggoon.
Kanzel is an antagonist in the fourth novel. He first appears to be a strong sorcerer working with Chris Saillune to assassinate his brother Phil. He is handsome, but has a scar on his right cheek and an icy stare. However, every time Kanzel attacks, he seems to be focused on killing Lina instead. Kanzel's actual partner, Alfred, eventually breaks ties with him because of his repeated deviations from their plan. Kanzel reveals himself to be a mid-ranked demon who teamed up with the Saillunes just so he could come into contact with Lina, whom he was ordered to kill with minimal human casualties; later revealed in the series to have been the orders of
Gaav. Kanzel is killed by Gourry's Sword of Light that was enhanced with Dragon Slave by Lina, and with help from Amelia.
Zuma : is a magic-wielding assassin who first appears in the fourth novel when he is hired by Kanzel to kill Lina. He has a reputation as the best in his line of work, with Lina being the only person to ever survive one of his attacks. Zuma continues to make attempts on Lina's life out of honor. Gourry uses the Sword of Light to cut off Zuma's right arm, while Lina turns his left hand to ash with a spell. Zuma returns in the sixth novel, still seeking to fulfill the contract to kill Lina and a new contract on the merchant , who hires Lina to protect him. Zuma has now fused with the demon Seigram, this being why he has both arms again; later revealed in the series to have been done by
Raltark. Zuma is also revealed to be the alter ego of Laddock. Zuma/Laddock/Seigram is killed by Lina's Ragna Blade, when his human heart causes him to hesitate after meeting eyes with his son. In
Slayers Evolution-R, Lina once killed a group of bandits that were responsible for killing Zuma's wife, thus denying him vengeance. He has his hands slashed off a second time before Xellos appears and kills him in order to steal the Hellmaster's Jar.
Demon-worshiping cult An unnamed is the antagonist group of the fifth novel. Based near the village of Mayin, they worship Shabranigdu and his five lieutenants; Chaos Dragon, Deep Sea, Dynast, Greater Beast, and Hellmaster. Using a manuscript of the Claire Bible, they resurrect , the beast who destroyed Sairaag 120 years ago, with the goal of attacking Saillune, but are stopped by the main characters. The cult is led by , who is ultimately killed by Zanaffar, and has many
werebeasts as loyal members; most were dying mercenaries saved by being turned into chimeras. Second-in-command is , a skilled swordsman killed by Xellos. The humpbacked werebeast fights together with , who controls shadows and is heard, but never seen. When they are killed by Zelgadis, it is revealed that Gilfa's brain and mouth were transplanted into Vedul's hump. Battle axe-wielding , whom Lina speculates is a fusion between human and
white tiger, wears an incomplete Zanaffar as anti-magic armor, but is killed by Gourry's Sword of Light. But it is another cultist who is consumed by a living Zanaffar armor for it to achieve its complete form; a silver, dragon-sized, wolf-like beast with whip-like tentacles. Lina kills Zanaffar by using her new spell Ragna Blade, which summons and channels darkness into a blade, to create a hole in its body that she then casts Fireball into.
Gaav : is one of the five demon lieutenants created by Shabranigdu who first appears in the seventh novel. Gaav's priest is and his general is . During the Incarnation War over 1,000 years ago, he fought Aqualord alongside Shabranigdu, but "died" striking the final blow. Although demons normally do not "die", their power is temporarily sealed and will recoup over time, Aqualord placed an imperfect seal on Gaav that caused him to be reincarnated into a human body. After countless reincarnations, Gaav has regained his memories and power, but his spirit has merged with his human host's. This causes him to oppose Shabranigdu and the other lieutenants; if Shabranigdu is revived, the human-bodied Gaav will be destroyed along with the rest of the world. Despite not knowing the details of Hellmaster's plan involving Lina, Gaav orders his subordinates to kill Lina; including Kanzel and Raltark, the latter of whom first appears in the sixth novel as
Laddock Lanzard's butler. Under Gaav's orders, Rashart becomes the head of the royal guard in the Kingdom of Dils and is tasked with forging an alliance with the dragons and elves, but the plan is foiled by Xellos. On Dragons' Peak, Raltark is killed by Xellos and Lina, which sees Rashart fetch Gaav. After seriously wounding Xellos, causing him to flee, Gaav fights Lina and company. But he is easily defeated by Hellmaster Fibrizo at the beginning of the eighth novel. Rashart continues to attack Lina and company, claiming to seek revenge for Gaav. However, it is eventually revealed that he is now working for Fibrizo, before being killed by Lina.
Hellmaster Fibrizo : is the most powerful of the five demon lieutenants created by Shabranigdu. It was Fibrizo who ignited the Incarnation War over 1,000 years ago when he awakened the part of Shabranigdu sealed within the sorcerer Lei Magnus. During the war, Shabranigdu posted Hellmaster to the Desert of Destruction as part of the seal to destroy Aqualord. According to Xellos, most of Hellmaster's servants were destroyed in the war, this being why Xellos is tasked with carrying out his plan of protecting and escorting Lina to the Claire Bible. Hellmaster is most likely the second-in-command of the demon race, and like all demons, he seeks to destroy the world and return everything to chaos. He manifests as an
androgynous young boy in order to trick his victims into underestimating him. Although Fibrizo first appears in the seventh novel as a child of Gyria City who sets Lina onto Gaav's plans, his identity is not revealed until the next novel, where he easily kills Gaav and kidnaps Gourry to Sairaag. Fibrizo plans to force Lina to draw upon the power of the Lord of Nightmares by using the Giga Slave spell, which she has now perfected after interacting with the Claire Bible as he intended. He hopes she will be unable to control the spell and it will destroy the entire world. Fibrizo kidnaps Gourry and takes him to Sairaag, which he has reconstructed out of the lingering thoughts of the dead and his own being. He eventually succeeds in forcing Lina to cast Giga Slave to save her friends. However, the Giga Slave summons the Lord of Nightmares itself using Lina's body as a vessel. Fibrizo mistakenly thinks Lina has retained control over the spell and attacks her from inside herself by exploding her heart; as everything in the new Sairaag is Fibrizo, part of him entered her body as the food she ate. But Lina appears fine and the Lord of Nightmares obliterates Fibrizo for his transgression of attacking it.
Sherra first appears in the ninth novel as a young girl who knows the location of a rumored magical sword located in the town of Bezeld. To Lina, Gourry,
Luke and Mileena, she seems to be the target of a group of men dressed in black that they suspect are also after the sword. However, she is eventually revealed to be a high-level demon and the general of Dynast Graushera. Sherra turns a man into a dragon-sized mass of flesh with leg-like appendages after he grips the black sword, which is itself a demon she created named , and has it attack Bezeld. This "hyperdemon" mass has ten spider-like legs, tentacles to suck the life force out of people, and extremely fast regenerative abilities, making any attacks against it useless. Lina realizes that it is a combination of a demonic curse and a human possessed by a demon, thus the only way to destroy it is to kill the demon who cast the curse. She also correctly suspects that the demon who cast the curse is the same one doing the possessing; the sword itself, which is fused into the mass. Lina and Luke destroy the hyperdemon by simultaneously using Ragna Blade and Rube-Eye Blade on the tentacle which houses the core of the fused demon. Sherra recovers her black sword, but Lina tricks the demon into withdrawing for now. In the eleventh novel, it is learned that Sherra had given Dulgoffa to
Bell. In contrast to the unwilling victim of the ninth novel, Bell willingly fuses with Dulgoffa and therefore appears as herself, but entirely black. Sherra reappears as the main antagonist of the twelfth novel. Posing as a mercenary, she quickly rose through the ranks in the Kingdom of Dils and effectively controls it with the king's complete trust. It is learned that she temporarily possessed the human nobles and officials who opposed her plans with Dulgoffa just long enough to weaken their wills, so they could then be possessed by low-ranking demons from the astral plane. Lina, Gourry, Luke and Mileena defeat Sherra together. In the fifteenth novel, it is revealed that Sherra's smile at death was because she identified Luke as a host of Shabranigdu when he grabbed Dulgoffa and was not consumed and passed this information on to Dynast.
Lavas Nexalia Langmeier is the regent of Solaria City and the main antagonist of the tenth novel. He holds the position due to his father, Klein, being ill. Lavas claims his older brother Veisam is plotting a rebellion and is the person behind the chimera factory that Lina and Gourry find, but suspiciously, the citizens of Solaria were unaware of Lavas' existence until recently. Lavas, who is really , the former king of Ruvinagald, is revealed to be the one behind everything and to be working with the men in black, whom Lina and company previously fought in the ninth novel. Before
Slayers began, Lina was part of exposing the Ruvinagald monarchy for conducting human experiments by forcing people, including children, into becoming hosts for demons. Lord Klein, a distant relative, offered Belgis asylum, before Belgis started poisoning him, took control of Solaria, and experimented on Veisam. Lina, Gourry, Luke, Mileena and Wizer Freion, a Ruvinagald inspector chasing Belgis, storm the castle. After quickly defeating a half-demon Veisam, they fight Lavas, who has turned himself into a demonoid and wears magical clothing and accessories, making him stronger than most pure demons. Lavas is killed by Lina's Ragna Blade.
Bell is first introduced in the eleventh novel as the reason recruits Lina and Gourry to stop the insurrection in Crimson Town. After her fiancé died, Bell married , head of the local sorcerers' council, and sent her younger sister, Aria, to warn of an insurrection her new husband was planning. After the insurrection takes place, Aria asks Lina and Gourry to help save her sister. However, after they kill Kailus, Bell reveals she was behind everything. After learning that Kailus had killed her fiancé, she was forced to marry him when he threatened Aria's life. Bell was given the demon sword Dulgoffa by Sherra and used her new powers to turn the members of Crimson Town's sorcerers' council into chimeras and start the insurrection in Kailus' name as revenge. These chimera include , an old man who creates many lesser and brass demons, and can also grow spider-like legs from his back to move at high speed; , a bizarre plant-like chimera with strong regenerative abilities, who dies with Kailus' death; and , a young woman with an emerald appearance that can reflect back magic she is hit with and who is absorbed by Kailus. With her goal complete, Bell, who is now fully fused with Dulgoffa, wants to kill Aria and herself. But Aria sacrifices her life in order to give Lina the opening to kill Bell with her Ragna Blade.
Dynast Graushera is one of the five demon lieutenants created by Shabranigdu. Suspecting Dynast is plotting another Incarnation War,
Milgazia and
Memphys team up with Lina and company in the thirteenth novel and investigate Gyria City, where the latter defeated Dynast's general Sherra in the previous book for seemingly gaining a controlling influence over the king. After entering the castle and defeating several demons, including , the king's trade minister, and , the king's sorcerer, Lina deduces that Dynast Graushera has been masquerading as King Wells Xeno Gyria this whole time. The heroes work together to defeat the demon lieutenant by having Memphys' Zanafa armor attach itself to him, sealing him off from the astral plane and his real body, and taking turns attacking, allowing Lina an opening to deal the final blow with her Ragna Blade. Although they succeed in destroying his corporal form, Dynast's real body still exists, but Milgazia doubts he will show his weakened state to humans. In the fifteenth novel, it is revealed that Graushera was copying what Fibrizo had done 1,000 years prior; cause war and destruction in order to find and awaken a fragment of Shabranigdu hidden in someone's soul. Sherra had successfully identified Luke as the host and passed this on to Dynast before dying.
Bradu is a demon who combats Lina, Gourry, Milgazia and Memphys several times in the fifteenth novel. He appears as a tall young man with blond hair. He summons lower-level demons such as , a pulsing green brain mounted on dozens of spider legs, and , a bunch of bones mounted into a vaguely humanoid shape with green fluid leaking at the seams. He also seems to summon nameless demons that look like dead trees in human form, which reconstitute themselves when damaged and replicate from any severed pieces. Some of Bradu's attacks on Lina and company are stopped by a demon resembling a skinless human with
eyestalks in place of eyes, who kills Gwon before being killed himself by a dead tree, and others by Xellos. Lina deduces that the dead tree demons are actually separate extensions of Bradhu himself. As Lina and company are about to kill him, Bradu offers to inform them why they are being lured to Sairaag. But Xellos quickly attacks and kills him before he can divulge the information. The demon-on-demon attacks are a result of some of the demons following the orders of the Shabranigdu in Luke, and others listening to the Shabranigdu frozen in the Kataart Mountains.
Valgaav : is one of the main adversaries in the
Slayers TRY anime. Once known as Prince Val of the Ancient Dragon clan, he is nearly killed by the Golden Dragons, who feared the dark powers of the Ancient Dragons and exterminated them. He is saved at the last moment by Gaav, who sees in him a powerful ally and a spirit of hatred towards the Golden Dragons for their betrayal. Gaav bestows upon him the powers of a monster and renames him "Valgaav". Valgaav and Gaav are separated when the other four Demon Lords create the barrier separating the outer and inner worlds. The barrier remains in effect until Hellmaster Fibrizo's death at the end of
Slayers NEXT. Valgaav is loyal only to his savior, Gaav, and gives no allegiance to any side, be it Slayers, dragons, gods, or monsters. With the combined power of a monster and Ancient Dragon, Valgaav is the strongest of Gaav's servants. However, he is notably weaker than Gaav. His Ancient Dragon power conflicts with the monster power given to him by Gaav, causing him pain. He is able to best Xellos in a one-on-one fight by using Ragud Mezagis, one of the five Dark Star weapons. He survives a magically amplified Dragon Slave fired directly into his body. Despite his prowess as a warrior, Valgaav is radically unstable and reckless. He activates the gateway created to summon Dark Star with only two of the five weapons required. Although the gateway is closed by other gods from the Overworld, Dark Star fires a blast through it that destroys Valgaav. He reappears at the end of the season merged with the fusion of Dark Star and Volphied, and acts as an arbiter of the two. Possessing the powers of both dragon gods and monster lords, he is easily the most powerful being faced in the entire storyline of
Slayers, although his power is cut in half by the open gateway. Valgaav/Dark Star/Volphied is destroyed by the combination of dark and light powers of Xellos's and Filia's abilities, combined with the five Dark Star weapons and Lina's incantation of Chaos power. At the end of
Slayers TRY, he is reborn as an egg and falls under the care of Filia and two of his former demi-human subordinates, Jillas and Gravos. ==Other characters==