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Voiced by: Charlie Schlatter
- Beware the Nice Ones: The calmest and most laid back character in the series, but he can go into Tranquil Fury and open a can of whoop-ass on his enemies without flinching.
- Cool Sword: His Guardian Strike Sword.
- Eye Beams: His main power is to fire lasers from his eyes.
- Deadpan Snarker: He often makes sarcastic remarks.
- The Hero: Is the de jure leader of a Five-Man Band plus a Fragile Speedster and helps the group to function as a whole. If the team is ever depicted in promotional art, Ace is usually placed front and centre.
- The Leader: He is cool under pressure and ready to take action at the drop of a hat, while also being quite well-liked by his teammates. Regardless of what Duck might want, Ace is the official leader of the team.
- Levitating Lotus Position: Does this when he meditates, presumably with the help of a floating platform he sits on while doing so.
- Pungeon Master: Prone to making puns while fighting enemies.
- Rascally Rabbit: Is definitely considered this by his enemies.
- Red Oni, Blue Oni: The blue to Duck's red.
- Roaring Rampage of Revenge: Went on a very brief one in episode five when he thought Slam had been killed (or at least seriously injured) by falling over a ledge, complete with angry yelling and laser-blasting as he virtually destroyed the rock-monster that did it. However, this only happened once and he was visibly relieved when he found out Slam was fine note , reverting back to his old self within minutes. Long story short: You really shouldn't mess with his teammates.
- Species Surname: Despite the shared surname, he and Lexi are not related.
- Standardized Leader: Unfortunately the crew seemed to take it for granted that viewers would think Ace was cool and his jokes were funny, and he probably got the least development of anyone on the team.
- Trademark Favorite Food: He likes carrots, like his ancestor Bugs Bunny.
Voiced by: Jessica DiCicco
- Beware the Nice Ones: Very laid back, but a few episodes hint that her powers are brought on by bottled up anger. One example is in episode 7 when their powers are switched (hers was switched with Slam's), she helps Slam to use her powers by using his anger.
- Cute Bruiser: She might not look it at first glance, but Lexi is extremely agile and can pack quite a punch.
- Ears as Hair: Keeps them tied up with a ribbon, as they were shown in a flashback to originally hang limp like a ponytail. Though that was before she got her powers.
- Green Thumb: Her temporary ability in "Apocalpyso".
- Pure Energy: Her "Brain Blasts".
- The Smurfette Principle: She is the only girl on a team of six and basically lives with five other guys. Although she has been shown to complain about the minor things that they do on occasion, she seems to treat them almost like family.
- Species Surname: A bunny whose last name is Bunny.
- Super Senses: Has super hearing and can pick up on normally inaudible sounds, such as breathing or minute seismic activity, even while standing in the middle of a noisy crowd. This also works as a sort of Imminent Danger Clue, as Lexi is always the first to warn the others if she hears something suspicious. It's also occasionally used as a means of guiding the characters to an important Plot Point that they probably would've missed otherwise.
Voiced by: Jason Marsden
- Aesop Amnesia: Danger Duck learns the downside of being a glory hound in "Cape Duck", only to go back to hogging all the credit for the team's heroics at the end of the episode.
- Alliterative Name: Both parts of his name begin with D.
- Anti-Hero: He fits this trope due to the fact that despite his heroics, he's a self-absorbed and narcissistic coward.
- Boss's Unfavorite Employee: Lexi Bunny has singed Duck's tailfeathers at least three times in irritation. Zadavia, "the Boss Lady" in Duck's parlance, has contacted Danger Duck for a dressing down in two (possibly three) episodes. Zadavia has softened this stance in season two, after Danger Duck freed her from captivity by her power-mad brother, Optimatus.
- Butt-Monkey: The prime example because he usually deserves it due to his Jerkass nature. Even in the season 2 opening he's shown to be The Chew Toy of the team.
- The Chew Toy: Often Played for Laughs, be it teleporting into an inconvenient spot at a certain moment or getting comedically tossed around by the Monster of the Week.
- Covered in Kisses: In the episode The Music Villain, the heroes are investigating a nightclub and Duck exits with lipstick marks on his face. He apparently spent the time flirting with a pretty young and intoxicated female club goer. When Danger Duck has to leave for his next mission, we hear a lovely voice call out "Ducky boy! Yoo-hoo!" Danger Duck laments leaving the woman we never see on camera, but duty calls.
- Crouching Moron, Hidden Badass: The show makes a big deal out of his goofy tendencies, but when he wants to be he's actually one of the most formidable members of the team.
- Deadpan Snarker: Duck is arguably the most sarcastic member of the group.
- The Ditz: He's easily the least intelligent member of The Loonatics.
Tech: What's wrong Duck?, I thought you couldn't spell the word "fear".Duck: Fear, F-E-E-E-R-E, nope still can't spell it.
- In the season 2 episode Cape Duck, He couldn't spell the word "fear"
- Deuteragonist: He is the second main focus behind Ace.
- The Friend Nobody Likes: Even his teammates seem to find him annoying because of his Small Name, Big Ego.
- Hand Blast: His Power Orb Randomizer. It seems to be a variation of Weaponized Teleportation, as his "eggs" are orbs of seemingly random substances that he throws at his target. Not even he seems to be able to completely control what they're made of one hundred percent of the time.
- It's All About Me: Like Daffy Duck before him, he's a massive egotist who's not happy to be playing second fiddle to a rabbit. Not to say he can't rise above it when he needs to, but this is his default.
- Jerkass: He's selfish and egotistical and thinks he's better than anyone else.
- Jerkass Has a Point: The show seemed to take it for granted that he was always wrong about whatever he said, but while Duck tended to do it "for his own egotistical reasons, he was Right for the Wrong Reasons more than they might've realized. For example in "The Comet Cometh," Rev starts going off on one of his high-speed rambles about what a "google" is, when a bored Duck shuts him up and gets an annoyed look from Rev. Consider, though, that the Loonatics were in a race against time to stop the world from being destroyed by a giant asteroid! Sure Duck was being kind of rude, but they couldn't afford to waste time on pointless distractions, even if that would be the "polite" thing to do.
- Jerk with a Heart of Gold: He's every bit as egotistical as Daffy, but he's still on the side of good.
- The Lancer: But would you really expect him to be good at it?
- Last-Name Basis: Although we don't know if his actual first name is Danger note , most of the cast (enemies included) just refer to him as 'Duck'.
- Leader Wannabe: He often wishes he were the leader instead of Ace Bunny.
- Let's Get Dangerous!: Is kind of a jerkass and egomaniac, but like the Trope Namer there's a real badass underneath who comes out when the chips are down.
- Plucky Comic Relief: Especially in the Denser and Wackier season 2, where he Took a Level in Dumbass and becomes even more of a Chew Toy/punching bag.
- Powerup Letdown: Seemingly in an attempt to make him seem less like The Load, in the second season Duck learns that his occasionally-helpful power eggs are turned into a Wave Motion Gun when he's around large quantities of water. The fact that this never came up before the second episode of the second season tells you a lot about how often he got to use it, though: it's only used in a single later episode, and from the way they talk about it before he does use it, it sounds like they might've totally forgot it was something he could do until right that minute.
- Red Oni, Blue Oni: The red to Ace's blue.
- The Rival: Danger Duck shows signs of this from time to time. However, given that he's based on Daffy Duck, this is somewhat to be expected.
- Small Name, Big Ego: Just like Daffy, he is extremely egocentric and thinks he's better than the rest of the group.
- Species Surname: He's a duck and his last name is Duck.
- Teleporters and Transporters: His "Quantum Quack" ability.
- Throw the Dog a Bone: Despite having the downer ending in most episodes, he comes off clean in the Season 1 episode Weathering Heights, where he gets together with Misty Breeze (the reporter who mistreated Weather Vane and whom he has a crush on) and the others leave him and Misty Breeze alone.
- Troll: He does this on several occasions with his Quantum Quack power.
Voiced by: Kevin Michael Richardson
- Big Eater: Has, among other things, eaten a whole pizza in one bite (while it was frozen) and asked for a chili-like food to be poured straight from a giant vat into his mouth. His teammates treat both events as totally unsurprising.
- The Big Guy: Though not the tallest member of the team, he's certainly the heaviest and most prone towards full contact attacks rather than the punches and kicks the rest of the team favors if they can't use distance attacks.
- Elemental Powers: Of the lightning/thunder variety. Somewhat ironic given his ancestor's penchant for creating tornadoes.
- Everything's Better with Spinning: Just like his ancestor Taz, Slam favors a twister-based attack, though Slam spices it up with lightning.
- Jobber: Back during his wrestling days, his fights often ended in losses.
- Lightning Bruiser: When he's using his Tornado Maximizer. However when he's in Thunder Mode, he turns into a...
- Mighty Glacier: In Thunder mode, he's a bruiser with lightning. However his bulk can and does hamper his speed.
- Species Surname: Tasmanian refers to his species of Tasmanian Devil. Uniquely among the team, his surname is only part of his species name.
- Super Strength: Easily the most physically strong member of the team. Slam frequently uses his own body as a battering ram, smashing through walls like they're not even there.
- The Unintelligible: While the team understands him, the audience is left to guess what he's saying based on the responses of those around him and context. He seems to speak slightly better English in the second season.
Tech E. Coyote
Voiced by: Kevin Michael Richardson
- Adaptational Badass: He's much more competent and successful than his Looney Tunes counterpart (his ancestor Wile E. Coyote) ever was. See Informed Flaw below.
- Badass Bookworm: Though Tech's no slouch on the battlefield, his real strength lies in his strategic skills and his inventions, both of which he can use at a moment's notice.
- Big Brother Mentor: To Rev. He acts as more of a guide to Rev than the rest of the team and Rev appears to admire him a fair bit.
- Cute Little Fangs: A fitting example, seeing as Tech is a type of canine. Although they don't exactly make him look threatening, they could be considered a visual hint towards his cunning nature.
- Deflector Shields: Made from magnetic energy.
- Gadgeteer Genius: He creates gadgets for the team to use.
- Good Thing You Can Heal: He is shown to be significantly more accident prone than the rest of the cast, often suffering heavy injuries that either leave him visibly charred or disintegrated into a little pile of ash. However, he can recover from these almost immediately thanks to his Healing Factor.
- Informed Flaw: Comments from characters (including Tech himself) in a smattering of episodes would have you believe Tech's inventions have a habit of comically misfiring like his ancestor's inventions to catch the roadrunner, but it just isn't true. The closest his inventions come to not working right is his teammates using them without knowing what they do, and when the Loonatics can't solve a problem by beating someone up it's usually one of Tech's inventions that saves the day.
- Omnidisciplinary Scientist: He was one even before getting his powers.
- The Perfectionist: About his creations. In one episode he constructed an accurate, miniature model of downtown Acmetropolis with moving trains that were synched to the city's transit schedule. According to him, that was a rush-job, as he did it during his break.
- Puppy-Dog Eyes: At times he does this, and when he does... it's just too cute.
- Red Oni, Blue Oni: The blue to Rev's red.
- The Smart Guy: The team's technician and strategist.
- Species Surname: He is a coyote whose surname is Coyote.
- Techno Babble: This is the way Tech usually tries to explain things to the rest of the team, using overly technical and scientific terms to get his point across. The others, save for Rev, rarely understand him though, and he almost always ends up having to speak in Layman's Terms anyway.
- Team Dad: In the eyes of some fans, as he usually tries to prevent any fighting amongst the team and acts almost like The Mentor towards the other characters.
Voiced by: Rob Paulsen
- Alliterative Name: Not just the name used by the show and most of the fans, but the full name possible if you use his full species name as a surname: Rev Road Runner.
- Attention Deficit... Ooh, Shiny!: He's easily distracted by his environment and the things said around him. This trait dies down a bit in the second season though.
- Big Brother Instinct: Though it's not as in depth as most examples due to only being in a single episode, he's noticeably protective of his younger brother Rip and dislikes how their father puts Rev himself on a pedestal while pretty much ignoring Rip, even giving Rev credit for ideas Rip came up with. He's also bound and determined to free Rip when his brother ends up Brainwashed and Crazy.
- Cloud Cuckoo Lander: Showed shades of being very eccentric in the first season.
- The Ditz: Sometimes. He gets better in the second season.
- Encyclopaedic Knowledge: While not always useful to the situation, he's been shown to have an extensive knowledge of random facts.
- Flight: Though he doesn't do it often, Rev is capable of flying without a jetpack and can even use his Super Speed while in flight.
- Fragile Speedster: Rev is obviously the fastest Loonatic and can usually avoid most attacks, but he doesn't take hits well at all and has been known on occasion to incapacitate himself by tripping or running into walls.
- Genius Ditz: He is the only other Loonatic who understands Tech's Techno Babble but has a tendency to be Sarcasm-Blind or get distracted at exactly the wrong moment.
- Keet: High-energy/hyperactive? Check. Brightly colored? Check. Chatty? Yup. Cute? By furry standards yeah.
- Kid-Appeal Character: Implied to be the youngest member of the team and the most likely team member to be interested in cartoons or comics.
- Motor Mouth: It's implied to be tied to his powers but in any case, Rev talking at a normal rate is cause for alarm.
- Red Oni, Blue Oni: The red to Tech's blue. He's also somewhat of a Red Oni to the rest of the team but it's most obvious in his relationship with Tech.
- Super Speed: Rev's main superpower. Notable in that despite his ancestor having this ability naturally, Rev didn't have it before the meteor that gave the team their powers.
- Talkative Loon: Rev tends to babble once he goes off on a tangent and it's difficult to get him to stop once he starts.
- Team Mom: In the eyes of some fans, as he panics if anyone gets hurt and is hinted to be the only one of the team who can cook.
- Toothy Bird: Has given more than a few big toothy grins over the course of the show.
Voiced by: Candi Milo
- Benevolent Boss: She is apparently very wealthy, while it's also been implied that she is the one who covers the team's expenses and provided them with their HQ.
- Big Good : She is the one the Loonatics answer to and get mission info from.
- The High Queen
- Human Aliens: She looks human, but is actually from the planet Blanc, as well as her brother Optimatus.
- Lady of War: Although she's content to let the Loonatics do the dirty work outside of season finales.
- The Mentor
- Mysterious Employer: Before her past is revealed.
- Out of Focus: She seems to appear less and less in Season 2.
Gunnar the Conqueror
Voiced by: Tom Kenny
- Killed Off for Real: He and his crew are the only villains in the series to die.
- Starter Villain: He is the first antagonist the Loonatics face in the series and dies in the first episode.
Pierre Le Pew
Voiced by: Maurice LaMarche
- French Jerk
- Gratuitous French
- Interspecies Romance: Briefly hits on Lexi. The feeling is not mutual.
- Long-Haired Pretty Boy: An older example.
- Multicolored Hair: Same color as a skunk's fur. It's more elaborate than a simple Skunk Stripe.
- Rapunzel Hair
- Smelly Skunk: A rare human example, thanks to his cologne.
Voiced by: Phil La Marr
- All Your Powers Combined: He managed to steal the powers of all the Loonatics.
- Attention Whore: He only wanted to use his powers to become famous.
- Dark Chick: Of the team of villains.
- Energy Absorption
- Evil Counterpart: He has many traits in common with Danger Duck, though he is much darker and more ruthless.
- Fake Ultimate Hero: He created disasters only to 'save' people from them and look like a hero to the rest of the city.
- I Just Want to Be Special: He's hinted to steal other people's powers and abilities because he wants to stand out.
- Jerkass: Puts the citizens of Acmetropolis in danger just to look good and blatantly mocks the Loonatics for being anthros instead of humans.
- Never Trust a Trailer: Sypher's seen in the show's opening sequence but for some reason his costume is blue instead of the red and yellow it is in the actual show.
- No-Nonsense Nemesis: He's aware that if he can steal powers from others by contacting them, then the opposite is true. That's why he doesn't let anyone get near him after he steals their powers. He doesn't fall for obvious tricks either.
Voiced by: Michael Clarke Duncan (Season 1), Kevin Michael Richardson (Season 2)
- Actually a Doombot: In "The Hunter", it turns out that Otto the Odd and Electro J. Fudd were using a robot double of Massive to try and lure Duck and Ace into a trap.
- The Brute: Of the team of villains. He loves to fight and is quite good at it. He also has the most muscular build of the team of villains.
- Gravity Master: Uses his gravity-based powers to alter how heavy or light something is as well as to levitate.
- Mighty Glacier: He can take hits and dish them out but most of the Loonatics can outspeed him.
- Nigh Invulnerable: His body is apparently dense enough that he can take a square hit to the chest from Ace's Eye Beams without even flinching.
- Scary Black Man: A blue-skinned variation on the concept but he otherwise fits it to a T.
Mallory "Mastermind" Casey
Voiced by: Florence Henderson
- All Your Base Are Belong to Us: She temporarily conquered the Loonatics' HQ in her debut episode.
- Arch-Enemy: To Tech. She targets him specifically in her first appearance and in most of her appearances after that, Tech seems particularly focused on defeating her personally.
- Evil Counterpart: Again, to Tech. She's just as brilliant as he is but has no sense of morals and no qualms about hurting others to get what she wants.
- Evil Genius: Literally.
- Interspecies Romance: It's hinted she and Tech may have had a relationship before she went evil.
- The Leader: She acts as this (as well as the Evil Genius) for the team of villains, but not as the Big Bad.
- My Brain Is Big: And the source of constant jokes.
Voiced by: Khary Payton
- Chronic Backstabbing Disorder: There isn't a single alliance he doesn't make just to get ahead and one he doesn't break as soon as it's no longer necessary.
- Evil Counterpart: To Ace, as is obvious from their names alone.
- Evil Redhead
- Human Aliens: He is from the same planet as Zadavia and Optimatus.
- Mecha-Mooks: His army of robots.
- Bitch in Sheep's Clothing: Looks like a nice old lady and a benevolent queen, but has a sinister agenda.
- Evil All Along: She is revealed to be Sylth Vester's employer to kill The Royal Tweetums.
- Evil Old Folks
- Evil Sounds Deep: She uses a voice modulator in her scepter to sound anonymous when speaking to Sylth Vester.
- Expy: Her name and character seem to be a parody of Emperor Palpatine aka Darth Sidious.
- Four Eyes, Zero Soul: Has spectacles, but is evil.
- It's All About Me: As shown later on, she is selfish and uncaring, and hires Sylth Vester to get rid of The Royal Tweetums so she can keep her throne. Ironically, her ancestor, Granny, was selfless, kind and caring, and even protected Tweety Bird from Sylvester.
- Samus Is a Girl: When speaking with Sylth Vester, she alters her voice to sound male and wears a cloak while speaking to him in hologram.
Voiced by: Charlie Adler
- Big Bad: While he doesn't appear often, he is the most important villain due to being Zodovia's brother and responsible for the meteor that gave the Loonatics their powers.
- HeelFace Turn: He renounces his ways and reconciles with his sister at the end of season two.
- Human Aliens: Like his sister, Zadavia, he is from the planet Blanc.
- Knight of Cerebus: Whenever he appears in one scene, the show gets darker.