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Captain Koinelius Tunar
- Voiced by: Robin Atkin Downes
Captain Koinelius Tunar is the commanding officer of a sand ship manned by Fish People. He holds an intense grudge against a creature called the Ramlak, which took one of his legs and ruined his people's homeland.
Tropes associated with The Captain:
- Animal Nemesis: Inverted. Tunar, a Fishman, has sworn vengeance on The Ramlak, a giant Planimal, a Man-Eating Plant/Giant Squid Hybrid Monster. It destroyed his home and took his eye and leg.
- Anti-Hero: Deconstructed, as it becomes apparent that his quest to kill the Ramlak has become all-consuming.
- An Arm and a Leg: Type 3. Tunar lost his leg (and an eye) to the Ramlak, and now uses a peg-leg.
- The Captain: Deconstructed. His fixation on the Ramlak has steadily eroded the relationship between himself and his crew.
- Determinator: And NOT in a good way, as he relentlessly persues the Ramlak:Tunar: "I'll follow ya straight to the flamin' pits of Magmel before I give you up!"
- Fish Person: He's a fish man.
- He Who Fights Monsters: His obsession with killing the Ramlak has made him callously indifferent of his people's suffering.
- Homage: To Ahab of Moby-Dick. He even quotes him at the end when the Ramlak pulled him in after getting harpooned, in the same exact way Ahab died. He may also be a very loose adaptation of Captain Hammerhand, from the original series.
- I've Come Too Far: He refuses to give up on hunting the Ramlak because of everything he's lost to it.
- Lack of Empathy: Illustrated towards his long-suffering crew, who he frequently dismisses as weak.
- Punny Name: His first name is a play on "Cornelius" and "Koi", while his surname is a play on "tuna".
- Revenge Before Reason: All he cares about is getting even with the Ramlak.
- Shadow Archetype: To Lion-O. Like Lion-O, he too lost his home to a horrible monster, one that he wishes to destroy at all costs. Seeing where that mindset eventually leads convinces Lion-O to move past his own inclinations of Revenge Before Reason towards Mumm-Ra.
- Weird Beard: Koi whiskers as facial hair.
Emrick the Petalar
- Voiced by: Atticus Shaffer (child), Patrick Cavanaugh (adolescent), and James Arnold Taylor (adult, elderly)
Emrick is a member of the Petalars, a small race of Plant Aliens who've been separated from their homeland for generations. They live for about a day! Despite this trait, he's a highly optimistic Petalar who possess an upbeat and adventurous attitude.
Tropes associated with Emrick:
- Ascended Fanboy: He becomes a warrior because he idolizes Lion-O and ultimately succeeds in becoming not only a warrior but a warrior leader.
- Badass Adorable: Capable of going toe-to-toe with opponents many times his size. Not that 'many times his size' is particularly big, but it's still impressive.
- Cheerful Child: An enthusiastic young Pollyanna, quite convinced that, despite being trapped in the Briar Woods for generations, Lion-O and his ThunderCats will help them find a way back home.
- Constantly Curious: He's full of questions for the ThunderCats. Lion-O says he reminds him of himself at that age, implying that he was one as well.
- Cradle To Grave Character: Goes from birth to death over the course of a single day/episode. His race doesn't live long.
- Final Speech: Assures Lion-O that It's the Journey That Counts
- Garden Garment: Wears green leaves that look like they may be in fact be part of his body.
- Heroes Prefer Swords: Makes one out of a twig to better model himself after Lion-O
- Hot-Blooded: His one constant trait, mirroring Lion-O.
- Intergenerational Friendship: An interesting variation. Lion-O is the elder, with Emrick as his much younger friend, but thanks to the Petalars one-day lifespans, Lion-O sees Emrick become the elder.
- The Leader: In adulthood, look to this one to give the Rousing Speech.
- Motor Mouth: During his youth. Luckily his mouth's small enough to be stopped with a little finger.
- Plant Person: All of the Petalars.
- Retirony: Dies before he can ascend the Cliff of Winds, (an uncoiled fern) and ride an updraft to his ancestral home.
- Tag Along Kid: He's like the little kid brother Lion-O never had. For about ten minutes, anyway.
Leo
- Voiced by: Will Friedle ("Legacy") and Jason Marsden ("Birth of the Blades")
Leo is Lion-O's ancestor, Commander Mumm-Ra's second-in-command and leader of the Animal rebellion.
Tropes associated with Leo:
- Adaptive Armor: Using Power Crystals as Amplifier Artifacts, his Claw Gauntlet can transform into a set of custom gold Lion armor.
- Astonishingly Appropriate Appearance: Like his descendants, his mane and eyes perfectly echo the hues of his weapon, but he lacks the justification of it being an ancestral birthright.
- Commanding Coolness: Like his immediate superior, also holds the rank of Commander (likely lieutenant commander)
- Cool Sword: He invented the Sword of Omens.
- In Another Man's Shoes: What we see of Leo's behavior is actually Lion-O performing a compulsory Vision Quest while being made to re-enact Leo's historical actions.
- The Mole: Leo's been a member of La Résistance for quite awhile, even while serving as The Dragon.
- Mythology Gag: Besides "Leo" being the Latin word for "Lion", it was also Lion-O's name in the German dub of the original show.
- Not What I Signed on For: For a while, he genuinely believed that Mumm-Ra could bring order to the universe. When Mumm-Ra demonstrates that he's willing to murder an entire star system to forge a super-weapon, he swiftly decides to form La Résistance in secret.
- Occult Blue Eyes: Blue-green eyes, like his descendants
- One Head Taller: Leo is a head shorter than his girlfriend Panthera. In fact, Leo seemed shorter than everyone in Commander Mumm-Ra's service.
- Pretty Boy: Lampshaded by his girlfriend PantheraPanthera (during a riot): Are you gonna stand there and look pretty or are you gonna fight?
- Rebel Leader: He inspired Mumm-Ra's prisoners to stand up to him.
- Royal Blood: His descendants ruled the Thundercats.
Captain Tygus
- Voiced by: Corey Burton
Captain Tygus is Commander Mumm-Ra's leader in the field, whose operations obtained the War Stone. Like other Tigers, he fought against Leo's Mutiny against Mumm-Ra. His clan was banished for this reason.
Tropes associated with Captain Tygus:
- The Captain: The hands-on, field-leader type, who conducts a one-man assault on a heavily guarded tower powered by a MacGuffin he's Plundering for his Commander.
- Expy: Of Tygra. Lion-O/Leo even lampshades the man's doubt in his plan:Lion-O/Leo: "A tiger underestimating me. I'm not surprised."
- Eyepatch of Power: Wears a Scouter
- Space Marine: Highly efficient against the hostiles that would stand in the way of his obtaining the Warstone.
- Unwitting Pawn: In a MacGuffin Delivery Service. He had no idea Mumm-Ra was just using him to get what he needed to make a weapon.
Panthera
- Voiced by: Cree Summer
Leo's beloved and coordinator of the rebellion.
Tropes associated with Panthera:
- Action Girl: Brings it in a staged prison break in "Legacy." Motive force behind the rebellion in "Birth of the Blades."
- Big Damn Kiss: Shares one with Leo as Mumm-Ra's spaceship/pyramid goes plummeting towards Third Earth.
- I Want You to Meet an Old Friend of Mine: Cree, of course, voiced Max on Batman Beyond, so has played the faithful partner to a Will Friedle character before.
- Lady of War: She's willing to fight if she has to.
- The Mole: She conspires with Leo while pretending to be loyal to Mumm-Ra.
- Morality Pet: In "Birth of the Blades" she was the one who openly questioned Mumm-Ra's brutal orders and caused the initially blindly loyal Leo to start questioning them as well.
- One Head Taller: Inverted. Leo only comes up to her shoulders if you count his hair.
- Replacement Goldfish: Following Leo's story, she functions parallel to Cheetara as a lion's undyingly loyal confidant, counselor, and Love Interest. In "Birth of the Blades," we see more to this relationship. Her initial doubt that Leo can make up for his mistake in believing in Mumm-Ra, leading to the destruction of a star system, not to mention calling him out on it, is rather reminiscent of Pumyra's initial doubt in Lion-O. As is the way she softens after Leo proves that he's thought this through, and is willing to follow through to the bitter end.
- Statuesque Stunner: Panthera towers over Leo and he definitely isn't complaining.
- Tiny Guy, Huge Girl: She's bigger than Leo.
- Undying Loyalty: Her faith in Leo is absolute, even when Leo is unsure of the outcome himself.
Shen
- Voiced by: Rob Paulsen
Leader of the Jackals who joined Leo in his rebellion against Mumm-Ra.
Tropes assocaiated with Shen:
- Heroic Dog: A humanoid canine who leads his people to rebel against Mumm-Ra.
- Reasonable Authority Figure: Willing to work with the Cats to escape.
Rezard
- Voiced by: Rob Paulsen
Leader of the Lizards who joined Leo in his rebellion against Mumm-Ra.
Tropes associated with Rezard:
- Expy: Of Slithe, of all people.
- Lizard Folk: He's a lizard.
- Meaningful Name: Rezard? Just swap out "Re" with "Li," and you get "Lizard."
- Reasonable Authority Figure: Also willing to work with the Cats, though he expresses more doubts than Shen about this.
The Drifter/Hattanzo the Swordmaker
- Voiced by: Stephen Root
A mysterious, eccentric rabbit man who offers Lion-O some much needed advice in the Swordsmans' Town.
Tropes associated with The Drifter
- Aloof Ally: "...if you expect me to help, you haven't been paying attention."
- ...And That Little Boy Was Me: The Drifter tells a Nameless Narrative of how the Duelist acquired his favorite trophy blade, implying that Lion-O will repeat the mistakes of its previous wielder.
- Badass Adorable: He's a rabbit and a skilled blacksmith.
- Badass Pacifist: "A weakness can be turned into a strength."
- Barefoot Cartoon Animal: Though he inhabits a world full of them, the Drifter specifically goes without shoes. In youth, he was The One Who Wears Shoes, but abandoned the trait after his loss to the Duelist triggered a deep depression.
- Barefoot Loon: He definitely comes across as one, at least until we learn his Back Story.
- Barefoot Sage: Considering the above tropes, and his Eccentric Mentor relationship with Lion-O.
- Beneath the Mask: His mildly amused, smiling, Brilliant, but Lazy exterior hides a despondent man who still grieves the loss of his masterwork to the Duelist.
- Black Eyes of Crazy: White iris-pupil on black sclera. Very downplayed. He's merely eccentric.
- Brandishment Bluff: Using the willow reed he keeps in his mouth, The Drifter parries the Duelist's attempt to stab Lion-O In the Back, then continues to mock-attack, relying on the Duelist's startlement and reflexive movements to trip him up. The Duelist lands on his rear and the Drifter mockingly sticks the reed up his nose.
- Brilliant, but Lazy: Until Lion-O piques his interest, he's too lethargic to be of any real help.
- Bullet Time: As "a drifter," he induces this at will, to the point where he appears able to Overcrank himself.
- Confusion Fu: Disorients opponents with Not Quite Flight, Nonchalant Dodge, and Brandishment Bluffs.
- Cool Sword: The Sword of Hattanzo, which he made himself.
- Dance Battler: He doesn't even need to throw a punch. At one point, he performs a pirouette in midair.
- Dark and Troubled Past: He lived as a vagabond because of shame at losing his sword to the Duelist.
- Despair Event Horizon: When he lost his best sword to The Duelist.
- Dissonant Serenity: Swinging a sword at his head won't faze him enough to open his eyes, or wipe the smile off his face.
- Distressed Dude: Downplayed. Tends to snag himself on fences and need Lion-O's help getting down, which begs the question as to why he always manages to appear wherever Lion-O is, just when the boy could use some advice...
- The Ditherer: Constantly qualifies his statements. You should take his advice...or don't...he doesn't care.
- Dramatic Wind: Accompanies him, ruffling only his hair and clothes in a given scene, to give an impression of his lightness. In a nod to his Empathic Environment, he frequently uses wind metaphor in his speech.
- The Drifter: Inverted. He poses as someone who quite literally blows into town, and claims to go "wherever the wind takes him" but that translates to floating around the fringes of the Swordsmans' Town, waiting for someone like himself to come along so he can deliver an Adventure Rebuff. By the time he's done with Lion-O, he's come to fully embody his archetype, walking into the sunset.
- Ears as Hair: A rabbit, his ears are as straw-filled, floppy and lank as his hair. In youth, they were expressive and sat high on his head, beginning to droop in defeat.
- Eccentric Mentor: "Take my advice and blow on out of here, or don't. I don't care."
- Enlightenment Superpowers: Not that he cares, but the Drifter has essentially perfected his Not Quite Flight and Nonchalant Dodge through suffering an ongoing major depressive episode. The languid movements that came with his feelings of despair and apathy after his defeat by the Duelist allowed him to become aware of all his flaws as a young combatant.
- Expository Hairstyle Change: The Drifter's hair is long and ungroomed, but as a young man, he wears his hair in a neat, shorter ponytail.
- Eyes Always Shut: Seems to only open his eyes when making particularly trenchant points or being very emotionally engaged.
- Fatal Flaw: His Hubris regarding his swordsmithing skill, assuming he made a sword so magnificent that it could surely beat even a master swordsman, regardless of the skill of its wielder.
- The Gunfighter Wannabe: Became a Scrap Heap Hero out of his failure.
- Hidden Depths: Guess why his entry has so many spoilers; he's much more than just a drifter.
- Homage: To Hattori Hanzō, particularly Kill Bill's swordsmith. As to the fact that he's a rabbit, well...
- Karmic Trickster: He messes with the Duelist in the end to get his sword back.
- Koan: "Willows are weak, but they bind other wood." Translation: You can defeat stronger enemies by tricking them into wearing themselves out through cunning.
- Leaning on the Furniture: Slouches, slumps or sprawls whenever there's a structure in his immediate vicinity.
- Limited Wardrobe: In his case, deconstructed. He's been wearing the same set of clothes for a long time, and it shows in their tattered, patched condition. He's been wearing them ever since his defeat at the hands of the Duelist.
- Meaningful Name: He literally drifts on wind currents as easily as a leaf. His real name, Hattanzo, is a contraction of Hattori Hanzō.
- Meek Townsman: "This is a Swordsmans' town, stranger, and they duel for keeps. Leave, before it's too late. Or don't, I don't care."
- Messy Hair: His dark brown hair is long, unkempt and full of bits of straw.
- Not Quite Flight: A marvelously absurd power to float on currents of wind, the catch being that he does seem to snag himself on tall fences rather frequently.
- Oral Fixation: Constantly chews a willow reed.
- Perpetual Smiler: He always has a mirthless smile that doesn't quite match his eyes. He starts smiling more genuinely when he and Lion-O become closer and team up against The Duelist.
- Pintsized Powerhouse: He's much shorter than Lion-O and The Duelist and he proceeds to kick the latter's ass when he tries to stab the former in the back.
- Rascally Rabbit: He's a rabbit who's a Trickster Mentor.
- Retired Badass: Was once "the greatest swordmaker of all time," but hasn't made a sword since his defeat by the Duelist.
- Righteous Rabbit: Yes, he's very eccentric, but he's definitely one of the good guys.
- Scarf of Asskicking: Amazing, since he manages to kick ass without kicking any ass.
- Scrap Heap Hero: A failed swordsman, but that doesn't stop him from blocking the Duelist's last knife attack with a willow reed.
- The Slacker: "There is such a thing as trying too hard, which is why I prefer not trying at all."
- Stepford Smiler: If his apathy isn't enough of a cue, his oft-present grin hides a deep depression at the loss of his masterwork, his finest sword, to the Duelist.
- Suspiciously Specific Denial: "I don't care," and many variations thereof, a de facto Catchphrase. Over time, the Implausible Deniability of the statement steadily increases to the point where it becomes obvious it's a lie.
- The Trope without a Title: He says he's "just a drifter, I suppose".
- Trickster Mentor: He's so good at it that Lion-O didn't even get what he was trying to teach him until he's practically already lost the duel. He even gave Lion-O a sword that he knew would break, just to drive the point home.
- Ultimate Blacksmith: Hattanzo himself, maker of the Duelist's best trophy, the Sword of Hattanzo.
- Unreliable Narrator: Downplayed. When telling a story, the Drifter conceals his identity as the protagonist, and his real name in the descriptor of his sword. Lion-O realizes the former, but not the latter, and the Drifter never directly acknowledges the story's implications.
- Waif-Fu: A rare Gender-Inverted example. Willow reeds kick ass.
- Walking Spoiler: It's hard to talk about him without spoiling how his episode ends.
- Warrior Therapist: Provides a very pointed critique of Lion-O's impatience and poor technical skill.
- Weak, but Skilled: If you're skilled enough, you CAN disarm someone wielding a knife with just a willow reed. In youth, he was its inverse, Unskilled, but Strong.
- Wuxia: His personal genre. Despite not being a trained warrior, he borrows from the Rōnin concept, and blows Wire Fu away.
Ro-Bear Bill
- Voiced by: Dee Bradley Baker
Ro-Bear Bill is a member of the Berbil race, a group of small robotic bears.
Tropes associated with Ro-Bear Bill
- Cute Machines: Hug hug hug hug hug!
- Happily Married: To Ro-Bear Bella. They have a son, Ro-Bear Beebo.
- Friend to All Living Things: It's in his nature to help everyone who needs it.
- Robot Buddy: To Panthro and Lion-O.
- Turned Against Their Masters: A relatively peaceful example.
Anet
- Voiced by: Kevin Michael Richardson
A leader of the highly forgetful monks of the Elephant Village.
Tropes associated with Anet
- Beware the Nice Ones: When they finally decide to engage the Lizard invaders, Anet gets a spotlight. He tosses a Walking Tank into its neighbor, and makes short work of Slithe's rifle, wrenching it out of his hands and bending it in half.
- Cool Old Guy: He's older than the other elephant people and proves on occasion to be a capable fighter.
- Exact Words: Anet tells Lion-O of a prediction of Tygra betraying him before the evening bell. At first it seemed Tygra would leave him to die in the Astral Plane before coming to his senses and helping and Lion-O felt the prediction was wrong. Anet, however, points out the evening bell didn't go off yet. Lion-O then sees Cheetara admitting her feelings to Tygra and the two kiss. Lion-O sees this and is shocked. Only then does the bell ring.
- Martial Pacifist: It takes them hours of meditation to come to the decision to fight and when they finally do fight, they still prefer intimidation rather direct combat.
- Prophecies Are Always Right: Even when he forgets what they are.
- Staff of Authority: He's the elephant people's leader and he wields a staff.
Aburn
- Voiced by: Jim Meskimen
Aburn is one of a group of Forgetful Jones mystic-monk Elephants who develops a friendship with Wilykit.
Tropes associated with Aburn
- Eccentric Mentor: To Wilykit. He manages to teach her to use her music to her advantage.
- Friend to All Living Things: All the elephants "respect the balance of nature".
- Gentle Giant: Like the other elephants, he's huge and kindhearted.
- Improbable Antidote: Don't underestimate the power of harmony.
- Let's Get Dangerous!: It takes a lot to happen but you do NOT piss off an Elephant without consequences.
- Mighty Glacier: It turns out his size makes him a very formidable force.
Zigg, Snips and Gami, the Wood Forgers
- Voiced by: Richard Chamberlain
Three Supernatural Martial Artists who staff a school of Paper Mastery and serve as protectors of the Forest of Magi Oar.
Tropes associated with the Wood Forgers
- Arch-Enemy: To Viragor.
- Art Initiates Life: Gami's paper beasts animate, move and employ Breath Weapons. Zigg can paint a vessel with his brush to capture and contain evil spirits, or paint a miniature animation of Viragor. Snips can create self-propelling pinwheels, snowflake blizzards and people-sized cages.
- Breath Weapon: Gami twice folds a giant animate paper dragon, which alternately breathes a powerful wind or purple bursts of fire.
- In Harmony with Nature: They use their wood forging to defend the forest against Viragor, employing a paper mill to produce their supplies. Which they do by unsustainable clear-cutting with no replanting, provoking the ire of Viragor.
- Macross Missile Massacre: One of Zigg's attacks is basically the paper version of this.
- Paper Master: Zigg favors calligraphy, Gami folded animals, and Snips papercraft.
- Paper Talisman: Used by Zigg, complete with Magical Incantation "Begone, evil spirits..."
- Protectorate: The Forest of Magi Oar.
- Punny Name: Zigg is from "zig-zag" Gami from "origami" and Snips from the action of a scissors
- The Voiceless: Snips and Gami do not speak, allowing Zigg to do all the talking.
- Well-Intentioned Extremist: Zigg explains that their processing of the magic wood into paper serves both the forest and people in need of the rescue his martial artists provide.
Viragor
- Voiced by: Héctor Elizondo
A monstrous bird who inhabits the Forest of Magi Oar and antagonizes those who travel and live within it.
Tropes associated with Viragor:
- Arch-Enemy: To the Wood Forgers.
- Dark Is Not Evil: While he looks very intimidating, he isn't nearly as mean as he looks. He even apologizes to Cheetara by replacing the staff he broke when he tried to eat her.
- Expy: In the Princess Mononoke - like plot of "The Forest of Magi Oar", he's closest to Moro. His warming to Lion-O also reflects this.
- Giant Flyer: He's a giant bird.
- Good Is Not Nice: Has no compunction about threatening the lives of those he sees as invaders, or inflicting massive amounts of property damage on an inhabited building. He also takes a shot at eating Cheetara, just missing her but breaking her staff in the process.
- I'm a Humanitarian: Played with. He's certainly big enough to eat people, and has a good try at eating Cheetara, but his eating people without provocation seems to be another Wood Forger lie.Lion-O: You're going to eat me, aren't you?Viragor: I'm thinking about it. He doesn't, instead telling his story to Lion-O.
- In Harmony with Nature: Very much resents perceived invasion of and damage to "his" forest.
- Nature Spirit: Stubbornly wages war on the Wood Forgers and demands they leave the Forest.
- Not Evil, Just Misunderstood: He is very confrontational at first, but mellows out quickly enough.
Javan
- Voiced by: Robin Atkin Downes
Leader of the banished Tiger Tribe, and Tygra's biological father.
Tropes associated with Javan
- Ain't Too Proud to Beg: He pleads with Lion-O to get Tygra away from the Tiger Village. It was to save Tygra and a sign the Tigers can be saved if they swallow their pride.
- Break His Heart to Save Him: Tried but failed to get Tygra mad enough at him. Hoping Tygra would leave before the other tigers tried to kill him, to end the curse they were all under.
- Daddy Had a Good Reason for Abandoning You: Either abandon his son, or kill him. He made the right call.
- Dead All Along: It's revealed that every member of the Tiger Tribe had been trapped in a state of undeath because of Javan's deception of the Ancient Spirits of Evil. Once the curse is broken by Tygra forgiving his father, the tigers are all able to fade from existence in peace.
- Meaningful Name: His name refers to the Javan Tiger, an extinct subspecies of tiger that was native to the Indonesian island of Java which makes sense when it's revealed that he and the rest of his clan have been Dead All Along.
- Papa Wolf: The assassins who try killing Tygra, learn this the hard way.
- Pride: Self-aware enough to realize that the Tiger Clan's pride has always been its greatest flaw. Even he didn't fully overcome it — he tries to break his son's heart to drive him away because he's too ashamed to admit the Awful Truth.
Caspin
- Voiced by: Jim Cummings (1952)
A member of the Tiger Clan's council.
Tropes associated with Caspin:
- Dead All Along: It is revealed that the Tiger Clan have been trapped in a state of undeath because the Ancient Spirits of Evil cursed them when Javan refused to kill his own son.
- Meaningful Name: Like Javan, his name refers to an extinct subspecies of tiger, in this case the Caspian Tiger. And of course, they and the rest of their clan aside from Tygra have been Dead All Along.
- Pride: He is quite vocal about it too, insisting that pride is all the Tiger Clan has left.
- Would Hurt a Child: He had no qualms with having Tygra murdered when he was a baby just because the Ancient Spirits of Evil demanded it.
Queen of Thundera
- Voiced by: Juliet Landau
The wife of Claudus, and the mother of Tygra and Lion-O.
Tropes associated with the Queen of Thundera:
- Death by Childbirth: She did not survive giving birth to Lion-O.
- The High Queen: She is beautiful and benevolent.
- Huge Guy, Tiny Girl: She's quite petite when compared to Claudus, who looks enormous when standing by her side. Her delicate build and petite stature may have contributed to her complications and death in childbirth.
- Law of Inverse Fertility: She and Claudus were struggling to conceive a child before Tygra came along, but were eventually able to have Lion-O by the time Tygra was a few years old. Unfortunately, she died in the process.
- Missing Mom: It is revealed in "Native Son" that we don't see her in present day because she died giving birth to Lion-O.
- Modest Royalty: Her clothing isn't very fancy.
- No Name Given: Has no known name aside from "The Queen".
Word of God is her name was going to be "Leona". - Proper Lady: She's gentle, incorruptible and pure. She sacrifices herself for her son Lion-O. She is devoted and loyal, and her good will and charity is what leads Tygra into eventually becoming a Thundercat. However, more important than anything else... is her gentle smile.
The Wily Family
- Voiced by: Chris Anthony and John Pirrucello
Wilykit and Wilykat's mother, father, sister and brother.
Tropes associated with the Wily Family:
- Cheerful Child: The younger siblings are often seen being happy.
- Country Mouse: They were farmers interested in visiting the city.
- Farm Boy: They're a family of farmers.
- Heroic Sacrifice: The father. When a tornado threatens the farm, he gets the family over a fallen tree to the storm cellar, but the tornado strikes before he can follow, killing him.
- Killed Offscreen: While the father's death is shown to be killed by a tornado, we don't see what became of the mother and the two younger children. when Wilykit and Wilykat left home. Presumably, they were killed when Mumm-Ra's forces attacked Thunderra.
- No Name Given: None of them have a name.
- Papa Wolf: The father goes out making sure Wilykit and Wilykat make it to safety.
- Posthumous Character: It's established early on that Wilykit and Wilykat are orphans. It is indicated in "Survival of the Fittest" that their father was killed by a tornado and that the twins unknowingly left their mother and younger siblings to die when they ran away from home.
- The Voiceless: The younger siblings don't speak.
Dobo
- Voiced by: Fred Tatasciore
A former slave and gladiator dog who fought alongside Panthro in the Pit. He rose through the ranks and became the boss of the arena.
Tropes associated with Dobo:
- Asskicking Leads to Leadership: Ended up in charge of the gladitorial games he was once an asskicking champion in, and it's strongly implied that he overthrew the previous management.
- Friends All Along: with Panthro
- Heterosexual Life-Partners: With Panthro. It ultimately turns out better than it did with Grune.
- Large and in Charge: Gladiator boss and easily one of the tallest characters in the series, towering over the already-massive Panthro.
- Meaningful Name: Dobo. Doberman. Get the picture?
- Noble Bigot: Despite thinking ill of Panthro for presumably abandoning him to the arena, and thinking that cats in general have no honor, he nonetheless greets Panthro as a friend and lets the ThunderCats stay in his city. Later, when Pumyra refuses to finish off Lion-O even when threatened with death, he even agrees to release Pumyra from the arena.
- Rags to Riches: Started out as a lowly gladiator fighting in the arena. By the time the ThunderCats meet him, he's the man in charge of the whole spectacle!
Tookit
- Voiced by: Fred Tatasciore
A pickpocket raccoon gifted with kleptovoyance, the ability to know the right thing to steal, even if he isn't sure how it will be useful.
Tropes associated with Tookit:
- The Artful Dodger: An adult example. He's perfectly fine with being a vagabond and uses his cunning to get by.
- Bag of Holding: His Forever Bag, the inside of which is located on the Astral Plane.
- Bitch in Sheep's Clothing: He is a charming sweet guy who gives street urchins food and safe haven, in exchange for them stealing money and jewels for him. And after they steal enough, they cannot return to the streets as they are wanted for all the crimes Tookit made them do.
- Engineered Public Confession: When facing down the Thunderkittens and his rebelling minions, he blurts out how he made the kittens and others steal for him, with the guard dog standing right behind him.
- Expy: A charming thief with a preternatural sense of thieving opportunities, and whose tools include a staff with a hook on one end? Apparently, Sly Cooper has family on Third Earth.
- Episode 22 also makes him into somewhat of an expy of Fagin.
- The Fagin: Tookit recruits children to steal for him.
- It May Help You on Your Quest/You Will Know What to Do: His kleptovoyance in a nutshell, leading him to steal seemingly worthless trinkets that soon after prove beneficial to him in some way.
- He incorrectly believes this applies to people too, believing that his frequent run-ins with the Thunderkittens are a sign that they will help him pull off the biggest heist in his life. Instead, they free the urchins he trapped in a life of crime by siccing a guard on him and stealing his Forever Bag. The only thing his kleptovoyance lead him to steal in this episode was a hairpin that allows him to break out of his cell at the end.
- Karma Houdini: He avoids getting in trouble for manipulating children into helping him steal stuff. While he's eventually caught in the episode "The Forever Bag" and forced to fight in The Pit, he pulls out a pin he stole earlier with the intent of using it to pick his cell's lock, indicating that his escape is imminent.
- Loveable Rogue: Manipulative and deceptive nature aside, he's not all that malicious.
- Pocket Dimension: The Foreverbag, used by Tookit to stash all of his riches by channeling the Astral Plane. How much room is in there? Well, for one thing the walls are out of sight...
- Punny Name: "Took it", referring to his thieving nature.
- Rascally Raccoon: He's a thieving raccoon who manipulates children into being his accomplices.
- Sticky Fingers: He'll steal anything he can grab.
Albo, Jenyo, and Gusto
Three children that Tookit has recruited into a life of crime and trained to be master thieves. They have become wanted criminals and are unable to return to an honest life.
Tropes associated with Albo, Jenyo, and Gusto:
- The Artful Dodger: They're homeless, but use their cunning to do what they can to survive.
- The Runaway: They ran away from home and had no choice but to be accomplices with Tookit.
- Sticky Fingers: They're pickpockets.
- Street Urchin: They're all orphans.
Ponzi and Lucy
- Voiced by: Jim Meskimen and Satomi Koorogi
A traveling potion salesman and his faithful giants caterpillar. He sells a cure-all elixir, but its side effects often cause patrons to eventually drive him out of town.
- Meaningful Name: Ponzi. As in, "Ponzi scheme".
- Shipper on Deck: He helps Lion-O try to get Pumyra's affections.
- Snake Oil Salesman: He sells his potion claiming that it can solve any problem and bails out whenever his customers complain about the side effects.
- Spanner in the Works: To Mumm-Ra in "Recipe for Disaster". His "transform into an unstoppable demonic dragon" plan would have gone off without a hitch if it weren't for this hapless potion salesman. Even Ponzi's surprised his elixir and his pet caterpillar turned out to be useful in the end.
Jorma
- Voiced by: Corey Burton
A Dog who is Lion-O's friend and deals in technology.
- Cool Old Guy: He has the mannerisms of an older man and he's willing to help Lion-O any way he can.
- Friend in the Black Market: He's Lion-O's main assistance in acquiring technology.
- Gadgeteer Genius: He does a lot of tinkering.
- Intergenerational Friendship: He's much older than Lion-O and is his closest friend.
- Interspecies Friendship: He's a Dog, his friendship with Lion-O may be the reason why the latter rejects much of the Cats' Fantastic Racism.
The Soul Sever
- Voiced by: Jeffrey Combs
An ancient, mad scientist cyborg bent on saving the souls of his deceased wife and children by giving them robotic bodies.
- Anti-Villain: He genuinely thinks being transferred into an immortal robotic body is a good thing, and only wants to save his family.
- Deal with the Devil: His deal with the Necro Mechers to keep his family alive, resulted in him becoming the mechanical monstrosity he is now.
- Mad Scientist: He tries to find a way to make mechanical vessels for his family's spirits.
- My God, What Have I Done?: His reaction to his attempt to transfer Tygra into a new body results in a gigantic rampaging monster.
- Tears from a Stone: At the end of the episode, he weeps upon seeing his family's souls depart into the sky. It's a sign that he's regained a small measure of his humanity, but at the cost of any hope he had left.
- Turned Against Their Masters: He destroyed the Necro Mechers when they refused to help him find a way to transfer souls into mechanical bodies.
- Well-Intentioned Extremist: All he wanted was a way to allow his family to live again.
- Woobie, Destroyer of Worlds: He just wanted to resurrect his family and make a better world, and ultimately was left with nothing but his own grief.
