Chu-Hui is known as "the True Master", a legendary martial arts master despite her appearance as a small, elderly lady. She lives on a temple located on a mountaintop in China near a remote, agricultural village, and has three animal guardians in the form of a bear, a snake, and a monkey, who have human knowledge and speech. The guardians test those who want to become her students.
Chu-Hui is named after series background painter Chu-Hui Song.
Cron and Kai are Centauri police that went to Earth to capture Blackfire. They are techno-organic humanoid crab aliens with a special weapon that extends a capture tentacle that constricts and neutralizes any special superpower of the person who is captured by it. Their probes mistook Starfire for her sister (since they are almost identical). After Robin pointed out that there was another Tamaranean on Earth, Cron and Kai took Blackfire into custody and cleared Starfire of any wrongdoing. They have not appeared in the series since.
Fixit is a cyborg hermit who can control machines with his mind. When Cyborg's power cell fails during a battle with Mumbo, Fixit takes him to be repaired in his underground home. However, his repairs are actually aimed to remove Cyborg's human parts, after which he attempts to download Cyborg's memories, but he is overwhelmed by the emotions of life he finds therein. The Titans find Cyborg in time for him to explain to Fixit what it really means to be human. Fixit understands this, and Cyborg offers to help him return to a life living a more human existence.
Galfore is the hulking Tamaranean k'norfka (the equivalent of a legal guardian) of Starfire, and has raised her since birth. When Starfire arrives on Tamaran for her marriage ceremony, he refers to her as her real name, Koriand'r. After defeating Blackfire in battle and exiling her, Starfire receives the crown and becomes Grand Ruler of Tamaran, but she decides instead to return to Earth and gives her crown to Galfore.
Larry is a Bat-Mite-like counterpart of Robin from another dimension, whose real name is Nosyarg Kcid (Dick Grayson spelled backwards). His right index finger has the power to bend reality, and he uses it to watch Robin. He enters the Titans' dimension to help fix Robin's broken arm, but he breaks his own finger during an argument and accidentally "breaks" reality. Examples of the consequences are Beast Boy losing his mouth and speaking backwards, and the T-Tower blowing a raspberry. After Larry's finger is repaired, he returns to his own dimension, but not before Robin offers him the chance to fix his broken arm one last time. He succeeds but accidentally traps Robin in another reality in the process.
On the episode in which he appeared, the theme song was sung in Japanese by Puffy AmiYumi producer Toshiro Kai.
Melvin, the only girl in the group and also the eldest of the three, has the ability to spawn creations from her imagination, so far just a giant animated teddy bear named Bobby. Timmy, the second oldest, throws earthquake and sonic boom-inducing temper tantrums, and Teether, the baby, can eat any form of matter and fire them like bullets. Raven, their appointed guardian, tries to save them from Monsieur Mallah, but the children and Bobby take him down on their own; Raven then makes them all Honorary Titans.
Bobby is Melvin's imaginary teddy bear. His powers include super strength, invisibility, and leaping ability, and he uses his invisibility to hide from people he does not trust.
Sarasim is a warrior princess from an ancient time. Her tribe, which is under siege from a horde of monsters, is saved when Cyborg appears to defeat them. Together, she and Cyborg fight Krall and a band of green glowing frog-like energy creatures. The two develop a relationship, but this is interrupted when Cyborg is whisked back to the present by Raven before he can aid Sarasim against Krall in battle. From Raven, however, Cyborg later learns that Sarasim did survive the fight.
Silkie is one of the many mutant larvae created by Killer Moth as part of his scheme to take over the city. When he was stopped by the Teen Titans, Beast Boy bonded with one of the larvae, secretly kept it as a pet at Titans Tower, and named it Silkie, but his cover is blown after the Titans return to find most of their furniture eaten. After Starfire feeds him Zorka Berries, which results in a monstrous growth spurt, Robin forces Starfire to get rid of the creature before he eats the entire tower. Starfire leaves him on an island with a note ("Please be kind to monster") carved into a rock. Killer Moth later transforms him into a monstrous moth, and the lepidopterized Silkie battles the Titans but becomes confused about where his loyalties lie, recalling the pains and kindnesses each of his guardians had brought him. Silkie then molts and reunites with Starfire.
The Dog is Soto's pet who is capable of articulate human speech and limited shape-changing. He escapes Soto's ship and crash-lands on Earth, where he inadvertently runs into Beast Boy. The Titans mistake him for Beast Boy instead, and capture him. He then reveals his true intellect, and agrees to help the Titans in recovering Beast Boy. After Soto is beaten, he and the Dog agree to switch roles of master and dog.
Aqualad's fish mechanic and friend, Tramm helps the Titans fix their T-Sub. He speaks in gibberish and has the appearance of a child with webbed hands and feet, scales, and a fish-like head. He can increase his strength and size when challenged to fight. Although he defeats XL Terrestrial and meets up with Aqualad, they are both overpowered by Plasmus and Trident. When he is freed by Más y Menos, he fights alongside Aqualad to defeat the Brotherhood of Evil.
Tramm is named after Cartoon Network's executive in charge of production Tramm Wigzell.
Val-Yor appears in the episode "TROQ," in which he helps the Titans defeat The Locrix, but the Titans then sever ties with him due to his prejudice against Tamaraneans, Starfire's race. The episode title is a Tamaranean word that means "nothing" and is used as a slur. He calls Starfire this word, but after she saves his life and helps him complete his mission, he refers to her as "the good kind," which was also considered offensive.
Adonis is a lanky young man in an enhanced-strength suit of armor. He loses a fight with Beast Boy when both combatants get covered in a strange liquid substance that causes each person to become a hulking werebeast. After his unsuccessful attempt at defeating Pantha under orders from the Brotherhood of Evil in the season five finale, Adonis sees Cinderblock under the control of Titan Jericho, but Herald sends Adonis's armor into another dimension and defeats him with a single kick.
Angel is a H.I.V.E. student who helps out the Brotherhood of Evil and appears alongside Punk Rocket to (unsuccessfully) take out Bumblebee. Her known powers are flight and enlarging her wings to attack her opponents. She is only seen attacking Raven in the final battle before being frozen by Más y Menos.
Atlas is a large and arrogant robot that enjoys video games and is obsessed with winning. He possesses great strength and multiple weapons, and refers to himself in the third person. Atlas has a servant, Spike, whom he treats poorly but depends upon to equip his weapons and tools. Spike leaves Atlas when Cyborg fights him for his friends, having come to accept Atlas' true attitudes as unbearable. Atlas is sent to take down Pantha, but he fails and his leg is then severed by Bushido. His remaining parts are then frozen.
Billy Numerous is a minor villain and student at the H.I.V.E. Academy. His power is self-duplication and he is known to brag about his massive crime spree around Jump City to his clones (his only friends). The Titans defeat him by using holograms to counter his natural self-duplication powers, causing him to push his power past its limit. He later becomes a member of the H.I.V.E. F.I.V.E. Billy is sent along with Gizmo to capture Kole and Gnarrk on the orders of the Brotherhood of Evil, and he is easily defeated by Pantha in the final battle. After his escape attempt is blocked by Kid Flash and Jinx, he is frozen along with his compatriots.
Brushogun is formerly a Tokyo manga artist who fell in love with a woman he drew. He used Japanese dark magic to bring her to life, but was then cursed with the ability to create live ink drawings. Brushogun was believed responsible for various criminal outbreaks in Tokyo, and upon tracking him down, the Titans discover he is actually an innocent yet frail old man hooked up to a giant printing press and held captive by Police Commander Uehara Daizo, who forced Brushogun to create criminals that Daizo would capture and thus look like a hero. When Daizo jumps into Brushogun's vat of magical ink, he emerges as an ink monster, which absorbs Brushogun. Robin defeats the monster by pulling Brushogun out of it, causing the ink creature to revert back to Daizo.
Cash and his pal Sammy are two mischievous teenage boys who stole Cyborg's newly-built T-Car and raced it in Crash Alley, but they lost the vehicle to Gizmo. After Cyborg defeated Overload, Cash and Sammy were arrested along with Gizmo.
Cinderblock is a humanoid concrete monster who is used to break Plasmus out of prison. He was easily defeated by Robin due to a tracking device planted on him that led Robin to Slade. Cinderblock was instrumental in Beast Boy's plan to infiltrate the Brotherhood of Evil's secret base by having Jericho take over his body. He was later frozen with the other villains at the base.
There are rare occasions where a Tamaranean during puberty become a chrysalis, but some do not survive after being eaten by creatures called Chrysalis Eaters. By turning into an Elvin woman, she lures Starfire into her clutches, but her attempt to devour her is interrupted by the other Titans. Starfire uses her newly-acquired power of shooting beams out of her eyes to send the Chrysalis Eater to its death of being eaten by a monstrous plant.
The Cironielian Chyrsalis Eater is named after series director Ciro Nieli.
Control Freak is an overweight and unshaven movie fanatic who is notorious for warping reality to suit his movie-inspired images. However, he rarely uses his great intellect, preferring instead to make himself look "cool" in TV Land or committing crimes that will make him look like a villain. Upon finding out that he is not on the Titans' list of notorious villains, he angrily exclaims that he is a recurring villain in the series and therefore should be on the list. Like the other Brotherhood of Evil villains, he ends up flash-frozen by the Titans.
According to his character designer, Derrick Wyatt, Control Freak is based on an idea Dwayne McDuffie had created for the Impulse comic book but never used.
Fang is is a mutant with a giant four-legged spider for a head, and is Kitten's original boyfriend. His powers are the ability to move at fast speeds and jump vast distances, as well as firing sticky web goo and paralysis-inflicting venom beams. He breaks up with Kitten but then attacks Robin for taking her as his junior prom date; he is defeated and then arrested along with Kitten and her father, Killer Moth. In the final battle, he is captured by Speedy and frozen.
She sends Gizmo, Jinx, and Mammoth to destroy the Teen Titans in order to take over Slade's business, but they fail and are punished while she herself is frozen.
Johnny Rancid's personality and appearance is a mix of a punk rocker and biker. When Larry breaks his magic finger, Johnny takes control of Larry's unleashed power and becomes a muscular brute able to wield red energy. When Larry uses his powers to revert everything back to normal, Johnny loses his powers and crashes into the earth. Rancid later returns with his robotic pet "dog" named Wrex, who himself is destroyed by the Titans after being distracted by a game of fetch. He is rebuilt as the monstrous Wrexzila and is later eaten by Silkie. Johnny teams up with Cinderblock to capture Más y Menos, but he is frozen instead.
Kardiak resembles a giant mechanical heart. Its abilities include the ability to change the shape of its valves into other mechanical objects. It has an affinity for capturing and devouring small children. Raven uses a spell to break it, but it regenerates and later kidnaps a girl, which the Titans eventually prevent. Later Kardiak attempts to capture Beast Boy for the Brotherhood of Evil but is frozen in the final battle.
Katarou is a martial artist who defeated Robin in combat. He claimed to have trained with the True Master, but it was revealed that he failed in his attempt to reach him, so he decided to use Robin to get past the True Master's obstacles without any efforts on his part. When he attacked Robin for the right to train under the Master, Katarou was apprehended by the guardians of the mountain, who were friends of the Master (an old woman named Chu-Hui), and thrown out. He later joined the Brotherhood of Evil, but was defeated by Bushido in the final battle.
Kitten is the spoiled daughter of Killer Moth and the girlfriend of the mutant Fang. She first appears when Fang breaks up with her for undisclosed reasons. Not wanting Kitten to attend the junior prom alone, Killer Moth blackmails the city with a large swarm of mutant moths to force Robin to become her date, which instigated a fight between Fang and Robin, and then between Kitten and a jealous Starfire. Kitten, Fang and Killer Moth were apprehended and jailed. Later on, they appear as members of the Brotherhood of Evil, but are defeated.
Kyd Wykkyd is a bat-costumed former student at the H.I.V.E. Academy with the ability to teleport. After Cyborg and the Titans destroyed the H.I.V.E. and the various students became renegade villains, Wykkyd joined the H.I.V.E. F.I.V.E. with Billy Numerous, but the group was defeated by Kid Flash. Wykkyd attempts to escape with the remaining members and is frozen in the process, but not before witnessing Jinx's betrayal to the side of good.
Malchior was a mighty dragon who fought the powerful wizard Rorek. Rorek's last curse seemingly defeated Malchior. However, Malchior rose up and captured Rorek, who used an ancient curse that ended up defeating and then trapping both of them in a book found by Raven. Passing himself off as Rorek, Malchior (in paper form) manipulates and enamors her by teaching her magic. After his true intentions were revealed, Malchior attacked the other Titans. He is defeated when Raven sends him back into the book. Malchior joined the Brotherhood of Evil, and was sent into another dimension in his paper form by Herald.
The Master of Games is a character who takes the male Titans, along with Gizmo, Hot Spot, Wildebeest, Aqualad, and Speedy to his own world in order to have a Tournament of Heroes, in reality attempting to steal their powers wtih his magic amulet. After his plan is unsuccessful, he captures Raven, Starfire, Terra, and five others for the Tournament of Heroines; the exact line of events is unknown, though the heroines likely emerged triumphant as well. He later joins the Brotherhood and is frozen during the final battle.
Mother Mae-Eye is a haggish being with a mass-produced army of gingerbread cookie soldiers. In her human form, she appears as a plump and kindly woman, but she is actually a three-eyed crone capable of growing in size and who feeds on the love and affection of her victims, whom she calls her "sweeties," "little ones," and similar terms of endearment regardless of their age. She then traps and bakes them inside a gigantic pie under the guise of their bedtime. Mother makes her series debut hiding inside a pie that Cyborg buys from a gypsy and brings to Titans Tower, where she is subsequently released. She puts the Titans under an immaturity spell by feeding them the pie while causing them to regress to childlike behavior.
The Titans find themselves helpless in their children's outfits and with useless weapons such as a baby bottle and a teddy bear when they are attacked by the H.I.V.E. F.I.V.E., who are driven off by Mother after she whacks them with her purse. After Starfire succeeds in freeing the Titans from the curse, they seal Mother back into her pie and send it to the H.I.V.E. F.I.V.E.'s hideout. Mother returns and joins the Brotherhood, but is defeated like the other villains; she disappears when she is hit by Hot Spot and Wildebeest near the end of the fight.
Mumbo is a turquoise magician whose powers are limited to small-time spells based on stage magic. He first battled the Titans in a junkyard and flees after being confronted about a jewel theft. Cyborg also goes missing and the Titans give chase after mistakenly believing Mumbo was involved in his disappearance. Mumbo is captured and his wand broken, stripping him of his magic powers. In another episode, he captures the powerless Titans in his hat and turns them into show animals, and after a humiliating show with such stunts as pulling Raven out of his hat and turning Cyborg into a dancing bear in front of an audience of Mumbo lookalikes, Raven defeats him by having Robin and Beast Boy (disguised as a paintbrush) paint them all in order to blend in with the stage, enabling them to return to the real world. Like the other villains, Mumbo joined the Brotherhood but was frozen in final combat.
Nufu is a species controlled by The Source, who uses Nufu Soldiers (aka Bob) to capture cows as power sources for their ships. Nufu's only known weakness is water, or someone consuming it, which is how it met its demise after being eaten by Cyborg. Bob is a servant of the Nufu Source. He and his clones were defeated when Beast Boy exposed them to water, turning them into tofu.
Overload is a villainous electric monster controlled by a small circuit board that harnesses electricity and the ability to control machinery, but is extremely vulnerable to water. Slade used it in his plans by sending it to battle Raven. During the final battle with the Brotherhood of Evil, Killowat absorbs Overload and leaves the circuit board behind, which is later frozen.
Private H.I.V.E. is the eponymous villain from the H.I.V.E. Academy with a military background. He uses a hexagonal shield for defense and attack, as a counterpart of Guardian. He forms the H.I.V.E. F.I.V.E. with four other H.I.V.E. students: Jinx, Gizmo, Mammoth, and See-More. They later join up with the Brotherhood of Evil, but Private H.I.V.E. is not seen when the group takes on Kid Flash. He reappears to help Fang unsuccessfully defeat Jericho. Inside the Brotherhood's base, he discovers that Cinderblock is really Jericho in disguise, but Jericho suddenly then merges with his body. Private H.I.V.E. fights in the final battle under and later free of Jericho's control, but is beaten and then frozen.
Professor Chang is a mad scientist created specifically for the series. He runs an underground operation providing supplies for higher-tier villains. Robin once forced him to hand over xenothium, the fictional power source for his Red X armor. In the third season, Robin goes to Chang, expecting the new owner of the Red X suit to show up for more xenothium, of which there is none. Chang sends Robin to a storage facility, which is a trap to get the xenothium for himself to power his new laser cannon. Red X teams up with Robin to destroy the cannon. Chang is imprisoned, but he escapes and attempts (with Brother Blood) to convert his students into cyborgs, but is thwarted by the Titans.
He is frequently seen in Red Star's flashback scene that recalls how he received his deadly powers. He joins the Brotherhood and helps them flash-freeze the captured heroes, but he and his cohorts are soon frozen themselves.
Professor Chang is named after Teen Titans director Michael Chang.
Punk Rocket, somtimes known by his first name, Thomas, originated in England and moved to the United States to gain respect. He wears a sleeveless orange prison jumpsuit, and has gray spiked hair and multiple piercings. His primary weapon is a guitar that releases sonic beams that are strong enough to blast through walls, and also enable him to ride his guitar through the air like a surfboard. Punk Rocket is first seen rudely interrupting a concert, but is defeated when Beast Boy goads him into cranking the guitar to maximum, blowing up the sound system it is linked to in the process. During the fight just prior to the final battle, Más stops Punk by knocking him into a portal created by Herald with his horn.
The Puppet King is an evil marionette who sucks all of the Teen Titans' souls into puppets, while switching the minds of Starfire and Raven, in an attempt to enact a ceremony that will turn the Titans' bodies over to him permanently. Eventually, however, Raven and Starfire put aside their differences and work together to stop him. The Puppet King's spells are broken and each Titan's mind returns to its proper body. At the same time, the Puppet King's soul leaves him and he is revealed to be only a lifeless marionette, which the Titans stow in their storage room. Along with Control Freak, he takes down Killowat for the Brotherhood, but is beaten up by Más prior to the final battle and is not seen again.
Originally, Red X was an identity Robin had conceived in an unsuccessful attempt to get closer to Slade. In the third season, the Red X suit is possessed by an unidentified antagonist, though not an outright adversary, of the Titans. Though he is a thief who looks out only for himself, the new Red X displays anti-hero tendencies such as helping Robin against Professor Chang and freeing the other Titans.
Red X's suit allows him to teleport, while the belt relies on power from a source called xenothium. His X-shaped palm gloves can form x-shaped projectiles which can act as shuriken, saw blades, restraints, timed explosives, instant openings and other functions.
See-More is a minor villain from the former H.I.V.E Academy. His powers — multivision, laser beams, and balloon-based flight — stem from a variety of colored "eyes" on his helmet, and he is a master of hypnosis. As a member of the Brotherhood of Evil, he and Warp are unable to take down Herald, and he is beaten by Pantha and then frozen in the final battle.
Soto is a formidable stone-bodied alien who comes to Earth looking for his green dog. He inadvertently abducts Beast Boy in dog form, but decides to keep him because it can change into any animal he wants. Soto is of a childish nature; his outfit resembles footie pajamas, and the controls of his spacecraft, toddler's toys. He surrendered his new pet upon being defeated by the Titans, after which he found himself face-to-face with his real dog, who informs him that he was tired of being the pet. They switch roles, with Soto eagerly agreeing to let the dog be his new master.
Soto is named after Teen Titans director Alex Soto.
An unidentified Space Monster is seen tearing apart a space station, which the Titans are sent to investigate. The monster nearly defeats them with his sonic powers, but then falls into a reactor. He catches up with them as they flee the station and lands on their ship, but is thrown off and crashes onto the planet where the Titans also land. He falls down a chasm during battle with Robin and Starfire, and is presumed dead as he is never seen again.
Steamroller is a gigantic cybernetic monstrosity used by Brother Blood with two cone-shaped gauntlets which, when joined together, form his namesake. Steamroller almost manages to defeat the Titans East until Cyborg brings them together as a team. But it turns out that the battle was a ruse for Steamroller to download the access codes to the Titans East's tower from Cyborg himself. Steamroller was later used by the Brotherhood of Evil to help the I.N.S.T.I.G.A.T.O.R. take down Thunder. He is defeated by the Titans and frozen in the final battle.
Trogaar is the Gordanian ruler of the prison ship on which Starfire, the Space Monster, a Locrix, and others were being kept. He was the Titans' first takedown as an official team.
An unnamed creature capable of merging into and assuming on the attributes of materials such as concrete, oil, brick, stone, water, and fire, the Titans cornered it in a recycling plant, but it was too powerful for the four Titans to defeat on their own, so they called Beast Boy for help. The creature's defeat therein is not shown.
Krall's magical assistant, she is referred to only as Witch. He freed her from eternal limbo and she thus became his slave. Condemned to obey Krall, she twisted his command for her to make him a hero. She sent her insectoid minions to attack Sarasim's town, and brought Cyborg from the future. Her fate following Krall's defeat remains unknown, though she is seen among the assembled entourage of villains in a separate episode.
'Wrestling Star is a large man wearing a red mask, red gloves and boots and a star on his blue leotard. His primary power is super-strength. A student of the H.I.V.E. Academy, he later joins the Brotherhood and is defeated in the final battle by Pantha, who, according to lucha libre tradition, claims his mask before he is picked up by Kid Flash and frozen.
XL ("Extra-Large") Terrestrial is a H.I.V.E. student who helps the Brotherhood of Evil take out Tramm. His powers grow in size by pushing the arrow on his chest, which he does during final battle, but suffers the same fate as other Brotherhood members in the end. However, when the Brain is frozen, he is seen in the crowd of Titans groaning about Beast Boy's joke.