Klarion acts like both a spoiled brat and a cruel, vicious, and spiteful sociopath. As Chaos personified, Klarion naturally takes great pleasure in causing chaos and hurting other people. Appropriately, his mind is likewise somewhat chaotic, prompting him to occasionally utter malapropisms, such as "what the carp" and "see you later, armadillos". He is utterly impulsive and demands immediate gratification for everything he does. His sense of loyalty towards subordinates seems mercurial, as he wantonly abandons his allies after being defeated. Aside from his cruelty, Klarion also acts like an immature and whiny child, who throws tantrums when he doesn't get what he wants, and screams angry threats that are made less intimidating by the childish way in which he does it.
Klarion only seems to care about his familiar Teekl, of whom he is very defensive (presumably because it is his only anchor in the Earthly plane). However, he is not above insulting Teekl during one of his tantrums.
Klarion takes the appearance of a scraggy boy with long, thin limbs, a thin neck and an angular face. He has black hair in a mop-top style with V-shaped bangs and devil-horns rising over the ears to points slightly above the top of his head. Along with his pointed crown, these devil horns gives him a distinctive three-pointed silhouette. He has arched eyebrows and sideburns that taper to a point. He also has long, sharp, black fingernails.
His clothes are formal, and predominantly black but include a white shirt with a tall, stiff collar (HRH collar). On top of this he wears a black skinny tie (low on the collar), black skinny trousers and pointed shoes, as well as a distinctive jacket. The jacket resembles a standard suit jacket around the chest and shoulders, although it has long sleeves with flared, pointed cuffs, and the jacket's skirt is similarly long (mid-thigh length) and shaped so that it comes to a point at the front. The jacket is fastened with two short button straps around the waist.
Klarion is an ageless Lord of Chaos who seeks means to strengthen his powers. He is anchored to the earthly plane by his familiar Teekl, who assumes the appearance of a cat. He allied himself with the Light, becoming its seventh member,mostly to cause chaosand because it seemed like fun.
When Aqualad, Robin and Kid Flash broke into Cadmus, Mark Desmond requested an audience with the Board of Directors, and briefed them on the incident, also informing them that the three heroes had been apprehended. L-3 ordered Desmond to clone them and L-1 told him to dispose of the originals. This course of action ultimately failed and the boys broke out and took Superboy with them. L-1 dismissed the severity of the ordeal and remarked that the loss of the clone could be played to the Light's advantage.
When Sportsmaster reported the loss of the batch of Kobra-Venom due to the young heroes' interference in Santa Prisca, L-6 conjectured that maybe they could reverse engineer the only salvaged vial. He then pointed out that this was not the first time the young heroes had thwarted their operations, recalling the breaking and entering of Cadmus and the destruction of Mister Twister, with L-1 now deaming the young heroes to be their new enemies.
Enlisting the talents of the faux magician Abra Kadabra, the pair attempted to locate and steal the Helmet of Fate from Kent Nelsonto permanently neutralize Nabu. While they managed to capture Nelson, he refused to divulge any information about where he had stored the Helmet despite Kadabra's torturing him.
When the Team was sent by Red Tornado to locate Doctor Fate, Klarion and Kadabra gained access to the Tower of Fate by following them in. The pair forced Kent to allow them into the tower as well, but Kent managed to get them all lost inside a maze-like pocket dimension. Kent managed to escape Klarion with the help of Artemis and Kid Flash, which infuriated Klarion immensely.
When Wally and Kent went to retrieve the Helmet of Fate, Klarion and Teekl managed to follow, during which Klarion hit Kent with a magical blast, killing him. Wally then proceeded to put on the Helmet of Fate, allowing for Nabu to take control of his body, transforming them into a new Doctor Fate. Klarion and Fate did battle, but eventually Klarion was forced to retreat when Fate attacked and gravely injured Teekl.
Teekl as it turned out, was not only Klarion's familiar but also his only tie with the physical non-magical plane of reality, causing him to fade. Klarion retrieved Teekl and escaped.
After the arrest of the Injustice League, Klarion was present with the other members of the Light to hear Vandal Savage's view of the Kobra Venom plant test and the heroes believing they had exposed the Secret Society.
Klarion and Teekl arrived on Roanoke Island to summon Wotan, Wizard, Blackbriar Thorn and Felix Faust with the help of a gem. In a pentagram, they spoke a spell that shifted the adults and children in separate dimensions.
Zatanna and the Team were on to him, but they were outmatched. Klarion easily deflected Zatanna's "baby magic", and transformed his familiar to battle the others. After Zatanna put on the Helmet of Fate, the tide changed, though Klarion noticed Nabu had trouble keeping himself stable in the separated dimensions. Eventually, the Lord of Order prevailed: Fate bound Klarion, but it was of short duration. After the separation spell had been undone, Klarion escaped and took Teekl with him.
Klarion was waiting for Sportsmaster at a warehouse, but wasn't pleased with what the mercenary brought in. He expected T.O. Morrow, not Professor Ivo. After Teekl informed him Morrow was in a coma, and Ivo started to get annoyed, Klarion decided it would do.
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After Sportsmaster delivered some of Ivo's equipment, Klarion, Ivo and Brain experimented on the echinoderm. They were interrupted by Artemis, but Klarion used his magic to allow them to escape.
Klarion controlled the Starro-tech-infected Justice League members from a special console on the observation deck. When Red Arrow, Red Tornado, and Black Canary arrived back at the Watchtower Klarion identified them as not being infected and quickly realized that the Team were neutralizing his "toys". Hal Jordan contained the three Leaguers, and they were tagged with Starro-tech again.
Much to his dismay, the Team robbed Klarion of all his "toys". He protested to Savage that they could still win, but Vandal did not want to risk destroying the satellite, or killing any Leaguers, fearing that Klarion would lose control. The Witch Boy objected, but after being told something by his cat, his admitted he would "bring the chaos".
Klarion ultimately overpowered his pursuer and restrained her in the Sacred Well Room of Marduk's Temple. Beta Squad, led by Nightwing, arrived on the scene, but Klarion's magic was too strong for them. He explained that he wanted to use his own magic to revive the alien weapon, but decided to siphon off Tula's instead.
He threw the reconstructed statue into the pool, which caused a giant water snake to come out. Klarion went on to explain that Tiamat was not his primary objective, but rather the Tablet of Destiny, an artifact of Order, which was bound to Tiamat. Klarion blasted the water snake, knocking the tablet out of it and Teekl ran off with it. Klarion chased after it, leaving the heroes to fight the water-snake form of Tiamat.
In another room, Klarion found Aqualad in possession of the the Tablet, and demanded it back. A fight ensued and Klarion inadvertently destroyed tablet, while trying to blast Aqualad. Though he was annoyed at the loss, he did not give it a second thought and made his getaway with Teekl.
Klarion was present with the rest of the Light as Sportsmaster aired his grievances regarding the death of Artemis and the revelation that Deathstroke has replaced Sportsmaster as the Light's new enforcer.
After the Light's summit with their erstwhile partners the Reach turned out to be a trap laid by Aqualad and the Team, Vandal Savage summoned Klarion from his ring. The witch boy transmogrified a sword that Miss Martian was levitating at Savage's throat into a fire dragon, and made it attack her. Klarion then activated a portal which whisked him, Teekl, and Vandal away from the underground cave.
Klarion is a Lord of Chaos, and as such is a powerful magic user. According to Doctor Fate, he is chaos personified and cannot really be contained. Much like Fate, he also faces the problem of needing an anchor in order to exist in the physical world, a role filled by his familiar, Teekl. He is able to manifest his powers in assorted forms, including, but not limited to:
Teekl: Klarion's familiar anchors Klarion to the Earthly realm; much like Nabu's with a human host. If Teekl is harmed or killed in any way, Klarion will lose his anchor and will be shunted back to his home dimension.
This is the second animated incarnation of Klarion. His first animated appearance was in the DC Animated Universe series The New Batman Adventures, in which he was also depicted as a spoiled child who acted out when he didn't get his way. However, in the former he was a normal human boy who had dabbled into witchcraft, as opposed to being a Lord of Chaos like in the current version. Moreover, his pet cat Teekl had the ability to turn itself into a humanoid-like form and often did its master's dirty work. Also, it had no apparent purpose of working as a mystical link between Klarion and the mortal plane.
In the show, Klarion is depicted as being far more powerful and villainous than his comic book counterpart.
There have been two distinct versions of Klarion in DC Comics:
The original Klarion was created by Jack Kirby, in which he is a child from "Witch-World". He is a completely psychotic brat-of-a-child who turned his own parents into mice, and fed them to Teekl. This version of Klarion and Teekl made their final appearances in the Young Justice comic series, particularly the "Sins of the Youth" crossover event, during which he added "Bum-Bum-Buuuum" to his name, for dramatic effect. The version used for the Young Justice animated series, obviously takes its primary inspiration from the Jack Kirby version.
In 2005, writer Grant Morrison created a new version of Klarion from "Limbo Town". This version while still rebellious and mischievous, is not a creature of pure evil, but instead is a relatively heroic character and far more sympathetic.