Characters from the Mario & Luigi series. Entries on the eponymous duo can be found here and allies from other games can be found here. Bowser's entry is here, while Kamek and the rest of Bowser's minions aside from the Elite Trio can be found here. Birdo is found here.
For simplicity's sake, entries for Recurring Characters are listed under the games in which they first appeared.
All spoilers are unmarked. Read at your own risk.
The son of Queen Bean, Prince Peasley is a hero of the Beanbean Kingdom. Despite this, even he gets into predicaments that require the Bros. help from time to time.
- 100% Adoration Rating: He's regarded very highly by the Beanbean Kingdom citizens for his mission work and generally being very cool.
- Baleful Polymorph: He is introduced having been transformed into Dragohoho by Cackletta.
- Beat the Curse Out of Him: How Dragohoho is turned back into Peasley.
- Big Damn Heroes: In Bowser's Castle, he swoops in at the last minute to help the Mario Bros. defeat Fawful.
- Bishie Sparkle: Lights up the whole screen with a flip of his hair. The remake adds in Love Bubbles as well.
- Black Bead Eyes: Like most of his Beanbean compatriots.
- Dishing Out Dirt: As Dragohoho, his main attack is spitting rocks at the Mario Bros.
- Distressed Dude: He manages to be turned into a dragon by Cackletta and saved by the Bros. He later gets eaten by a Piranha Bean, and is saved by Luigi.
- Foil: He is the Beanbean counterpart of Mario, but while Mario is a humble, homely Everyman, Peasley is more of an egotistical pretty boy.
- Friendly Rivalry: Starts a friendly competition with the Mario Bros. to see who can find the Beanstar pieces first.
- Incredible Shrinking Man: Getting eaten by the Piranha Bean briefly made him shrink. Even his Bishie Sparkle got smaller.
- Living Ship: He flies around everywhere using a strange bean with feathered wings.
- Requisite Royal Regalia: He is always shown wearing a fancy red cape and white gloves.
- Royal Rapier: His weapon of choice.
- Royals Who Actually Do Something: Peasley warns Peach about Cackletta's plans, tries to put a stop to her (and gets turned into a dragon, but points for trying) and instigates the search for the Beanstar pieces.
- Scaled Up: Being forcibly transformed into Dragohoho.
The good-natured ruler of the Beanbean Kingdom, Queen Bean was driven to a mad rampage when Cackletta infected her with a worm. She is eventually snapped out of it by the Bros.
- 100% Adoration Rating: She is apparently quite beloved by her subjects, which is shown during Dream Team's Chain of Deals when you must give a photo of Queen Bean to a homesick Beanish to cheer him up.
- Abnormal Ammo: When her arms are taken out as a boss, she spits beans at the Bros. to attack.
- Adipose Rex: A doubly rare instance of both a female and a good-natured use of the trope.
- Big Beautiful Woman: That one homesick Beanish tourist in Dream Team certainly thinks so.
- Brainwashed and Crazy: As well as getting Charles Atlas Superpower.
- The Caligula: Averted, as she seems to be a very effective ruler when snapped out of her rage.
- Cognizant Limbs: Her arms must be taken out before you can attack her proper.
- Reasonable Authority Figure: When not brainwashed by Cackletta.
- Shockwave Stomp: As a boss, she can pound the ground with her fists to create a shockwave.
Queen Bean's cloaked advisor who helps the brothers after they free her from the bowels of the castle. Cackletta disguised herself as her and used her appearance to not only steal Peach's voice, but also trick the Brothers into disabling the security system around the Beanstar, thus getting the plot started.
- Beta Couple: With Toadsworth, as indicated by the last cutscene showing the two hugging affectionately before he has to return to the Mushroom Kingdom.
- Gag Nose: She has a rather large curved nose. Sorta counts as Sinister Schnoz when Cackletta is disguised as her.
- Milking the Giant Cow: Waves her arms in a wizard-like fashion sometimes when saying something dramatic or when agitated.
- Rescue Introduction: She is first met for real (by both the characters and the player) when the Mario Bros. unlock her jail cell. The fact that she talks to them as if she has just met them for the first time is also the first clear indication that the "Lady Lima" you met earlier was actually a fake.
- Treacherous Advisor: Subverted; the "Lady Lima" who betrays you is actually Cackletta, whereas the real Lima helps direct the brothers on where to go next, and helps successfully run the Beanbean kingdom.
Two Toad brothers who diligently scout out Stardust Fields. They teach Mario and Luigi the High and Spin Jump moves.
- Ascended Fanboy: They're admirers of the Mario Bros., and not only do they get to meet, the Starshade Bros. also get to teach their idols a couple of useful abilities.
- Color-Coded Characters: One is red, the other is green.
- Disproportionate Retribution: Think some angry turtle guy is whining too loudly? Just fire him out of a cannon!
- Drill Sergeant Nasty: Their main character trait.
Two master blacksmiths who forge the Mario bros hammers, and later upgrade them.
- Birds of a Feather: Minion Quest sees them bonding with two Hammer Bros. over their love of hammers.
- Color-Coded for Your Convenience: Sledge is red, Mallet is green.
- Drop the Hammer: They're hammers that create a hammer by mashing their heads on the anvil.
- Fetch Quest: sends the Mario Bros. to obtain a Hoohoo block to create their hammers.
- Use Your Head: How they make the hammers.
A large-toothed pterosaur who inhabits Hoohoo Mountain. Initially found tending an egg on the mountain's peak (revealed to hold Peasley in the form of Dragohoho), he later flies the Bros. up to the peak whenever they want.
- Chekhov's Gunman: He flies you up to Bowser's Castle near the end.
Bubbles and Boddle
Eccentric Beanish brothers, Bubbles is a Chuckola brewer who has been telling the Chuckola Reserve many jokes for many, many years, while Boddle is a Yoshi enthusiast who is planning to open Yoshi Theater.
- Fetch Quest: Two layers. In order for him to relinquish the Beanstar piece in his possession, the heroes must give him seven Neon eggs from the Yoshis in his theater, who in turn will only lay them if they were fed Neon fruits.
- Really 700 Years Old: Bubbles has been aging the Chuckola Reserve for a thousand years. Though he definitely looks old, his brother does not.
- Serious Business: Bubbles spends a very long time concocting a special kind of soda, and then has the soda come to life and attack people who try to take it.
- What Happened to the Mouse?: Bubbles vanishes after the Chuckolator fight.
The Jellyfish Sisters
Sister Masseuses who teach the brothers how to use the techniques for Firebrand (Mario) and Thunderhand (Luigi).
- Color-Coded for Your Convenience: Gigi wears a red dress while Merri wears a Green dress.
- Impossible Hourglass Figure: Both of them.
- Meaningful Name: Merri = Mario. Gigi = Luigi. Although the colors are swapped for whatever reason.
- Playing with Fire: Gigi in red.
- Really 700 Years Old: Considering that the Great Firebrand said that the last person before Mario to show up at his temple did so 3000 years ago, the Jellyfish Sisters have to be much Older Than They Look.
- Shock and Awe: Merri in Green.
A large, speech-impaired, sidestepper-like hermit crab who lives in Gwarhar Lagoon. He finds a piece of the Beanstar after it breaks apart and with help from his Beanish friends uses it as a star for his Christmas-themed shell. He gets into a fight with the Bros when they come to get the Star Piece, but amends are later made when they replace the lost star with Spangle, a small starfish in need of a stage.
- Attention Whore: His posse are so elated by the Bros. appearance, that they stop decorating his shell and begin gushing. He then loses it and attacks the two.
- Expy: Hermie III looks very similar to the Yadotsuri enemies◊ from Tomato Adventure, also developed by the same company.
- Giant Enemy Crab: He's a hermit crab big enough that he needs a shell the size of a medium-height tree to live in, and towers over both the brothers and his Beanish pals.
- Logical Weakness: He's based on an aquatic creature yet he's weak to fire attacks, most likely because of the tree and decorations on his shell.
- Penny-Pinching Crab: He's a gigantic hermit crab obsessed with hoarding trinkets with which to decorate his shell: the crowning piece of his collection is one of the fragments of the Beanstar placed on the top of his shell, which leads to trouble when Mario and Luigi come looking for it. He's also very narcissistic his battle is initiated when he gets angry that his companions are paying more attention to the famous brothers than to him and his decorations. He does eventually give up the star fragment, and the bros make peace with him later in the game by offering up Spangle, a starfish musician looking for a stage, as a replacement star.
- Poisonous Person: Spits poison bubbles as an attack.
- Speech Impediment: He speaks with a lisp, using th- instead of s-.
- Stone Wall: When he retracts into his shell, he can tank all attacks. Worse, he will heal himself in this phase until Mario hits him with a fire attack.
A renowned tailor who exhibits a nasty angry side, he has come up with the practice of "Splart" as a complex method of dyeing clothes.
- Ambiguously Gay: He's a flamboyant, somewhat androgynous fashion designer.
A Wicked Witch who has long bedeviled the Beanbean Kingdom, Cackletta learned that only one with a beautiful voice could use the wish-granting artifact known as the Beanstar...so she and her eccentric henchman, Fawful, turned to the neighboring Mushroom Kingdom to steal the voice of its monarch, Princess Peach. Big mistake—the Mario Bros. were on the case in a heartbeat.
Halfway through the game, Mario & Luigi confront Cackletta and successfully defeat her. She nearly dies from the fight, but Fawful saves her by absorbing her soul with his headgear. Shortly afterward, Fawful projects her soul into an unconscious Bowser's body, reviving her as Bowletta.
- Ambiguous Gender: When she possesses Bowser and becomes Bowletta, resulting in Pronoun Trouble.
- Badass Cape: She wears a black, spiky one which resembles a bat's wings.
- Badass Boast: When Mario and Luigi corner her in the Woohoo Hooniversity, she makes it clear that she's going to really let the Bros. have it:"Ha! Hmmph! Well, won't this be fun! Oh yes! If that's how it is, I'm ready for you! I'm going to knock you all the way back to the Mushroom Kingdom!"
- Bat Out of Hell: Attacking one of her copies will cause it to turn into a swarm of bats and attack the bros.
- Big Bad: Of Superstar Saga.
- Boss Remix: Her first battle theme is a remix of her leitmotif crossed with the "panic" theme.
- Cognizant Limbs: Cackletta's ghost has four separate targets: her right hand, her left hand, her head, and her heart.
- Cool Chair: She uses a jet-propelled throne as her method of transportation, though once she becomes Bowletta, she ditches it in favor of using Bowser's vehicles instead.
- Dark Action Girl: She may be an old crone, but she's not afraid to get her hands dirty; especially when she becomes Bowletta.
- Deader Than Dead: Initially, she's mortally wounded after her encounter with the Bros. at Woohoo Hooniversity. But after becoming Bowletta, her soul is destroyed from within Bowser's body, ending her for good.
- Death from Above: When Bowletta is low on health, they will start using an attack which causes star-shaped projectiles to rain down. The stars are Color-Coded for Your Convenience - the red ones are aimed at Mario, the green ones are aimed at Luigi, and the purple (yellow in the remake) ones don't hit anyone and are just for show.
- Demonic Possession: Cackletta's body dies about halfway through the game, but her spirit possesses Bowser, creating the mind-scarring...thing...that is Bowletta.
- Disc-One Final Boss: She manages to play this to herself — she's fought and defeated in her original body halfway through the game, which you're briefly led to believe is the end, but then she comes back as Bowletta...
- Doppleganger Attack: She can create duplicates of herself to confuse attackers.
- Eviler Than Thou: While she's not the first Mario villain that would upstage Bowser* , Cackletta was the trend-setter, demonstrating levels of cunning and improvisation that Bowser had no chance to match until several games later.
- Evil Laugh: "Eeyah ha ha ha!"
- Final Boss: Of Superstar Saga, as Bowletta (and her spirit).
- Forgotten Fallen Friend: Isn't mentioned at all by Fawful in Partners in Time or Bowser's Inside Story.
- Greater-Scope Villain: In Minion Quest, by proxy of being the boss of Fawful, the actual Big Bad of this sidequest.
- Heads I Win, Tails You Lose: After the bros. seemingly defeat Bowletta, a Time Bob-Omb walks on screen and instantly KOs them. Bowletta then swallows them whole, and the bros. are forced to fight Cackletta's ghost inside Bowser's body.
- HP to 1: Mario & Luigi's Hit Points are reduced to one before the final battle with her spirit.
- Killed Off for Real: Mario and Luigi first kill her body, then they exorcise her soul inside of Bowser. In a series where Death Is Cheap, she holds the dubious honor of being the first Mario villain to ever suffer such a fate.
- King Koopa Copy: Invoked for Bowletta, because she uses Bowser's body as well as his army, stronghold and vehicles.
- Master of Disguise: Her Lady Lima disguise is flawless despite Lady Lima being much smaller than she is. And Minion Quest shows she can pull off a near flawless Bowser disguise in her Bowletta form as well, apart from the Eeyah ha ha ha! and destroy Mario.
- Meaningful Name: Cackletta. The Beanbean Kingdom values innocent and happy laughter, so what better a name for a villain than one derived from an Evil Laugh?
- Nightmare Face: During her first encounter with the Mario Bros. in Woohoo Hooniversity.
- Ominous Pipe Organ: Features heavily in her rather somber Leitmotif, as well as the battle themes of both Bowletta and her ghost.
- One-Winged Angel: She has both Bowletta (Cackletta possesing Bowser) and her ghost form.
- Organic Bra: When she is Bowletta, she has two large plates on her chest.
- Our Ghosts Are Different: The final enemy Mario and Luigi face in Superstar Saga is Cackletta's ghost, possessing Bowser.
- Out-Gambitted: Quite possibly the only reason her plans failed was because Peach had been warned well ahead of time that she'd be after her voice for awakening the Beanstar, so she set up a decoy. This is also the case when she (as Bowletta) tries to take Peach and the Beanstar at Jokes End, as Luigi fooled both her and Fawful with his Peach disguise and managed to escape them with the Beanstar.
- Playing with Fire: She can throw magical fireballs. As Bowletta, she gains Bowser's fire abilities, and her Soul ca use fire to attack.
- Portable Hole: Can create this to make the Mario Bros. fall inside and take damage.
- Pre-Asskicking One-Liner: Has one for the Bros. in her final battle, before she proceeds to absolutely destroy you.Cackletta Soul: Are you still conscious? Ugh. You're a persistent pair! Eeyah ha ha ha! I shall dispose of you quickly, and then eat you for lunch!
- Punny Name: In both English and Japanese; in the latter her name is "Geragemōna", "geragera" being an onomatopoeia for laughter. Her localized name refers to cackling, which she does in fact do (being a Wicked Witch and all).
- Regal Ruff: Wears one that resembles a flower's petals. Although she is not from a noble background, as far as we know, her fancy style of clothing symbolizes her aspirations of taking over a kingdom.
- Sequential Boss: The final battle has two phases. The first phase is the fight with Bowletta. For the second phase, she eats the Mario Bros., and they fight her spirit inside Bowser's belly.
- Shielded Core Boss: When fighting her ghost, her Cognizant Limbs need to be destroyed in order to expose her heart, which is the main target.
- Shock and Awe: Her main attack in the first battle is firing magical lightning bolts. Her soul uses an orb of lightning as one of her attacks.
- Slasher Smile: As Bowletta, her default expression is a toothy, demonic grin.
- Sore Loser: She most certainly doesn't take her defeat at the hands of the Mario Bros. well.
- Summon Magic: Her spirit is capable of summoning an apparition that resembles Fawful, which will continuously attack the Mario Bros. until they hit it with their hammer.
- Take Over the World: Or at least two kingdoms. She was probably planning on expanding, eventually.
- Turns Red: Two examples (three in the remake):
- Once Cackletta becomes low on health, she will reuse the black hole attack she uses at the start of the battle. Also, she'll be making that Nightmare Face constantly. This is kept in the remake, though she also starts glowing and fuming as with every other boss.
- When Bowletta is low on health, it will change its color palette to mostly black. In this state, Bowletta cannot be jumped on, and they get a new attack where they cause a bunch of stars to fall on the bros. This is kept in the remake, though Bowletta starts glowing as above.
- Exclusive to the remake, Cackletta Soul will literally turn red after its health is depleted enough.
- The Unfought: Despite appearing a few times in Minion Quest, the four Captains never get to fight her.
- Vacuum Mouth: Using Bowser's body, she does this to Mario and Luigi after the first phase of the final battle, leading to them fighting her soul.
- Voices Are Mental: Implied for the original, as Bowletta is technically Cackletta using Bowser's body, and speaks with the former's voice. This was both implied and averted in the remake's overworld where Cackletta's regular voice is used and the Bowletta boss fight where Bowser's voice is used instead.
- Walking Spoiler: Not so much Cackletta on her own as Bowletta, the form she takes midway through the game upon being killed and then possessing Bowser.
- Wicked Witch: Just look at her. She's even got the cackle down.
A crazed inventor who constantly spouts strange similes and garbled English, he first appeared as Cackletta's right-hand man, aiding her in her schemes. He was seemingly killed near the end of Superstar Saga, but in fact survived, laying low in the sewers of Peach's Castle, running a badge shop while plotting his return to glory. He carried out these plans in Bowser's Inside Story, returning as the main antagonist, causing the Blorb outbreak, and taking control of both Bowser's and Peach's castles, as well as unearthing an ancient evil in order to use its power for his own ends. Of course, in taking Bowser's Castle, he angered the Koopa King; a mistake that ultimately led to his downfall.
- Advancing Boss of Doom: During the fight with the Dark Star Core, Fawful will shroud the area in darkness then chase Mario and Luigi while the Dark Star Core flings itself at Mario or Luigi.
- A God Am I: His ultimate goal in Bowser's Inside Story was to absorb the power of the Dark Star and take over the Mushroom Kingdom.
- Badass Bookworm: A skilled inventor, a competent schemer, and more than capable of handling himself in a fight if he has to.
- Bald of Evil: As the picture shows, he's completely bald save the little wisp of hair on his head.
- Benevolent Boss: He is kind and respectful to Midbus and gets complete loyalty in return. His benevolence towards Midbus is one of his very few, if not only, redeeming qualities.
- Beware the Silly Ones: He may be completely freaking nuts, but that doesn't mean he can't be dangerous.
- Big Bad:
- Ascended to this position in Bowser's Inside Story. He even foreshadowed it in Partners in Time.
- He's also the villain of Minion Quest in the remake of the first game. He still works for Cackletta, but she isn't fought and isn't even much of a factor, with Fawful responsible for much of the plot.
- Bizarre Alien Biology: The final fight with him in Superstar Saga has him sporting an antenna on his head, making him look like a stereotypical alien.
- Brains Evil, Brawn Good: Especially in Bowser's Inside Story where he, the Gadgeteer Genius, serves as the Big Bad and Bowser, the Dumb Muscle, serves as the Villain Protagonist.
- Brainwashed and Crazy: Brainwashes much of Bowser's army in Bowser's Inside Story. The remake of Superstar Saga shows that this isn't the first time he's done this.
- Breakout Villain: Went from a right-hand man to the main villain of the first game, and a sewer hermit in the second, to become the third game's main antagonist himself.
- Casting a Shadow: After absorbing the Dark Star's energy.
- Catchphrase: The above quote. In Bowser's Inside Story, he instead favors the variation "I have chortles!".
- Cheshire Cat Grin: His default expression. They can turn into unsettling Slasher Smiles near the end of the game. Especially as he tries to take out Mario and Luigi as he dies.
- The Chessmaster: Masterminded the plot of Bowser's Inside Story.
- Classic Villain: Representing Ambition, Pride and Wrath.
- Cloudcuckoolander: A rare, villainous example.
- Demoted to Extra: In Partners in Time, his role is reduced to being a shopkeeper. He does foreshadow his role as a Big Bad in Bowser's Inside Story though.
- Department of Redundancy Department:Fawful: But now it is the time for the final act in the finale's closing last encore!
- Disney Villain Death: Gets sent flying in Superstar Saga. The Mario Bros. should have made sure he was dead.
- Doomy Dooms of Doom: His iconic "The mustard of your doom" line in Superstar Saga.
- The Dragon: To Cackletta in Superstar Saga.
- Dragon Ascendant: He is the Big Bad of Bowser's Inside Story.
- Dragon-in-Chief: Not quite in the original, where he's just a particularly noisy-but-loyal henchman to Cackletta, his last words notwithstanding. His final speech in both versions has him realize this, and he is the one who resurrects her in both versions as Bowletta. But in the 3DS remake, it's more obvious than ever that Cackletta needs him a lot more than the other way around. In the final boss fight of the Minions' sidestory he defies a direct order from Cackletta to take down the Minions once and for all. Instead, he fights the minions with an army of mechs made in his own image, and outright tells her to her face that he's busy with scheming.
- Dual Boss: In the final battle of Bowser's Inside Story, the Dark Fawful Bug and the Dark Star Core team up to attack in their phase of the fight. Once Fawful's legs are taken out, he is rendered immobile until the cycle repeats.
- Emergency Transformation: After being beaten by Bowser, Fawful transforms...into a small insectoid blob of dark energy.
- Eternally Pearly-White Teeth: That grin of his remains gleamy white no matter what he goes through.
- Evil Tastes Good: He's quite fond of food-related metaphors, especially in Superstar Saga.Princess Peach's sweet voice will soon be the bread that makes the sandwich of Cackletta's desires! And this battle shall be the delicious mustard on that bread! The mustard of your doom!
- Final Boss:
- Of Bowser's Inside Story, fused with the Dark Star as the Dark Star Core. He shares this duty with Dark Bowser, but in order to make Bowser able to defeat him, Mario and Luigi must defeat the Core first.
- Of Minion Quest, first fought in a long, yet standard battle in his main form and then fought with his robot army in his second form.
- Final-Exam Boss: In Minion Quest, the final battle with him is a six-part fight in which he switches between Melee, Flying, and Ranged patterns.
- Foil: To Bowser. Bowser is strong but not super smart whereas Fawful is smart but physically weak. Bowser rules his minions through a combination of fear and respect with his charisma whereas Fawful brainwashes everyone into worshipping him.
- For the Evulz: While Fawful does have a plan, very few of his projects involve it at all. The only apparent motive for 80% of his actions appear to be for sheer fun.
- Four Eyes, Zero Soul: A crazed villain with thick swirly spectacles.
- Gadgeteer Genius: On top of his magic powers, he invents many quirky machines, such as the Peach-bots and Vacuum Helmet. He even turns Peach's Castle into a Humongous Mecha near the end of the game.
- Gambit Roulette: Fawful, predictably, slips into this territory. For instance, getting Toads infected with the Blorbs seems to have no other purpose than to draw Bowser out of his castle in concern for "his" kingdom and get beaten up by Mario, then smacked into the forest where he'd accept the mushroom from Fawful in desperation for a means to beat Mario. The Blorbs have the added effect of keeping everyone busy with the epidemic and off his tail, effectively making his work invisible until it was too late.
- Giggling Villain: "I HAVE CHORTLES!"
- Greater-Scope Villain: Of Bowser Jr.'s Journey. The Best Fitness Friends are taking orders from Fawful.
- Intentional Engrish for Funny: Fawful's most defining trait.
- I Shall Taunt You: Loves to excessively taunt and ridicule his enemies, almost to the point of trolling them. His constant target is Bowser, who he goes out of his way to anger.
- It's All About Me: Showed shades of this in Superstar Saga. He had a literal camera crew during the cutscene before his final battle. Bowser's Inside Story took this trope Up to Eleven and beyond with him turning Bowser's castle into Fawful Theater, complete with statues and merchandise of him, a show about him that he would perform, and brainwashing Bowser's minions into treating him like a celebrity. And his speech at the end of Inside Story can be summed up as "It wasn't my fault. I did everything right! It was you Mario Bros. who ruined everything! And if I'm going down, I'm Taking You with Me!"
- Killed Off for Real: He dies at the end of Bowser's Inside Story and makes no appearance in later games. He's notably the only character in the entire franchise to appear in multiple games before being killed permanently, without even so much as coming back as a ghost.
- Laughably Evil: His bizarre speech patterns, nonsensical metaphors, and zany actions are amusing, and yet he managed to unleash an Eldritch Abomination upon the Mushroom Kingdom.
- Mad Libs Catchphrase: "I have ____!" Most apparent in Bowser's Inside Story.
- Mad Scientist: He's a brilliant inventor despite being a complete nut.
- Make My Monster Grow: During the fight with Dark Bowser, Fawful can revive Dark Bowser when his health is depleted and double his normal size. And when he fights the Mario Bros., he grows to a towering insect monster.
- Malevolent Mugshot: Good God! The guy has statues of himself everywhere in Bowser and Peach's castle. In the remake, even in Bowser's insides.
- Meaningful Name: His name is derived from the words "guffaw" and "awful". His Japanese name "Gerakobits", just like his boss's, comes from "geragera", an onomatopoeia for laughter.
- Narcissist: Bar none the most narssistic villain in the Mario series.
- New Powers as the Plot Demands: His Vacuum Helmet in Superstar Saga and his Ray Gun in Bowser's Inside Story, both of which do whatever the plot needs him to do.
- Nice Hat: His Vacuum Helmet in Superstar Saga and Bowser's Inside Story, which helps him fly and fight.
- Nice Job Fixing It, Villain!: Giving Bowser the Vacuum Shroom would prove to be a fatal mistake, as Bowser eventually learns how to control it and turns it against him in the Final Battle.
- On a smaller scale, by turning Midbus into Blizzard Midbus, he unintentionally provides the means for Mario and Luigi to traverse the Airway and chase the Dark Star when Blizzard Midbus is defeated by Bowser and transformed into an ice block.
- Noble Demon: In Bowser's Inside Story, when Bowser arrives just as they are attempting to break the seal on the Dark Star, Midbus prepares to fight him. Fawful is uneasy about it at first and decides to fight alongside him. But he then changes his mind out of respect for Midbus's pride and instead powers him up with his ray gun to give him an edge.
- No Cure for Evil: Averted. During his fight with Bowser, Fawful's Vacuum Helmet can periodically heal him unitl it's destroyed.
- No Name Given: In the Spanish version of Superstar Saga, he's merely known as Esbirro Jijí, "Cackletta's Minion".
- Not-So-Harmless Villain: His defeat in Superstar Saga reduced him to a lowly shopkeeper with delusions of grandeur and plans for revenge. Bowser's Inside Story sees him carrying out those plans and his rise to the Big Bad of the game.
- One-Winged Angel: An accidental one. See Emergency Transformation for details.
- Opaque Lenses: With swirls on them. Fitting, given what a nutjob he is.
- Perpetual Smiler
- Plucky Comic Relief
- Psychopathic Manchild: The "child" part really shines in his voice clips.Fawful: YAY!!!
- Ray Gun: Has one in Bowser's Inside Story, which can be used for a variety of purposes.
- Recurring Boss: Fought twice in Superstar Saga, Minion Quest and Bowser's Inside Story for a total of six unique fights in the series, a number beaten only by Popple's seven and Bowser's thirteen.
- Red and Black and Evil All Over: In Bowser's Inside Story, he wears a black jumpsuit with a red cape.
- Red Eyes, Take Warning: After absorbing the Dark Star's power, his glasses turn red.
- Red Oni, Blue Oni: Serves as the red to Cackletta's blue and conversely, the blue to Bowser and Midbus's red.
- Shock and Awe: His antenna in Superstar Saga can fire electric bolts.
- Slasher Smile: His default expression. It gets even wider as he's about to try and take down the Mario Bros. with him.
- The Starscream: Subverted near the end of Superstar Saga, when he considers being his own boss for a change instead of merely a henchman. He ends up being defeated before he can pursue the issue any further, but ultimately gets his wish anyway.
- Squishy Wizard: He struggles to carry Princess Peach after removing her from Bowser's body.
- Strange-Syntax Speaker: He tends to phrase things as "I have (some emotion)" rather than just saying "I'm mad" like most sane people do.
- Sudden Name Change: Twice, in fact! In the Spanish translation, he goes from Esbirro Jijí in Superstar Saga, to Fawful in Partners in Time, and finally Gracóvitz (a transliteration of his Japanese name) in Bowser's Inside Story.
- Supreme Chef: Even Bowser admits that Fawful's cooking is amazing.
- Taking You with Me: Tries to do this at the end of Bowser's Inside Story.
- Talks Like a Simile: Likes to liberally sprinkle his speech with similes. Really weird ones, too.
- That Makes Me Feel Angry: Most of his "I have ____!" quotes are this, as he loudly proclaims what mood he's feeling at the moment.
- Took a Level in Badass: In Bowser's Inside Story. Watching him go from The Dragon to Big Bad is a sight to behold.
- Verbal Tic:
- In the Japanese version (where he was known as Gerakobits), Fawful punctuated his sentences with "~Fururururu!". This was changed drastically in the localization. The French localization keeps the tic in the form of an Evil Laugh that goes "Fuyuyuyuyuyuyu!".
- In Superstar Saga, he has the tendency to call people "fink-rats." He only does it once in Bowser's Inside Story.
- Villain Song: Parodied. Although he does a better job of it in Minion Quest.Fawful: Fawful sings a song of bad! Mushroom Kingdom is so sad! All of it for Fawful and the...rhyme...with that.
- Weak, but Skilled: In terms of physical prowess, Fawful is sorely lacking; even carrying someone as dainty as Princess Peach is a huge burden for him. But he's a very skilled Gadgeteer Genius and a chessmaster with a gift for improvisation.
A criminal and self proclaimed 'Shadow Thief', from Beanbean who encountered the brothers several times. Has no ties to the main villains but becomes a nuisance with the help of his incredibly dangerous sidekicks.
- Bash Brothers: The only bosses that have their own Bros. Attacks are himself and Bowser.
- Battle Couple: According to Birdo at least; Popple had his objections.
- The Bus Came Back: He returns in Mario & Luigi: Dream Team trying to rob the denizens of Pi'illo island.
- Butt-Monkey: Doesn't get a piece of loot for his efforts, suffering even at the hands of his Rookies. Even his Bros. Moves always involve him getting harmed in some extraordinary fashion.
- Captain Oblivious: He makes enemies of two famous heroes and enlisted a king as a lackey, and still has no idea.
- Catchphrase: "I'll be taking that, see?" and "Boo, I say!"
- Combination Attack: With his "Bros. Moves". He also tends to be on the short end of them too.
- Cowardly Boss: In all of his Dual Boss battles, once his "rookie" is defeated, he's quick to turn tail and flee.
- Crash-Into Hello: His first appearance in Dream Team has the Mario Bros. (specifically Luigi) running into him as he exits a house in Wakeport. The crash resulted in Popple dropping a few Pi'illo trinkets.
- Demoted to Extra: While he made a few major contributions to the plot in Superstar Saga, he has very little importance in Dream Team.
- Dirty Coward:
- Runs as soon as his partner falls, aside from a rare moment of Villainous Valour.
- In Dream Team, he attacks Mario and Luigi immediately after Wiggler is beaten just because he wants all of the treasure for himself.
- Discard and Draw: In the Teehee Valley battle, he's a bit weaker than the last time the Mario Bros. fought him, but now has Birdo backing him up.
- Dragon-in-Chief: Inverted. He has a bad habit of hiring "rookies" that are way more dangerous than he is. Taken to its logical extreme when he makes the Mario Bros. themselves his rookies in Dream Team.
- Dual Boss: Most of the battles with him are fought alongside whoever his current "rookie" is. The only exception is the third battle; he fights solo since, at the time, he didn't have a rookie.
- Even Evil Has Standards: Willing to move the Beanstar out of harm's way and bow to Mario before battle.
- Irony: After beating him for the final time in Superstar Saga, he can be seen working a job polishing mushrooms in Little Fungitown. His Toad boss calls him "Rookie."
- Jerkass: He was never nice, even to his own rookie(s).
- Lone Wolf Boss: He isn't affiliated with the main antagonist of either of the two games that he appears in, he just wants to steal treasure.
- The Millstone: When he's "on your side" in Dream Team. He not only provokes a completely unnecessary boss fight with a friendly Wiggler, all his actions in the fight only make the Wiggler madder.
- Never My Fault: Possibly the only person who has placed blame on Bowser and got away with it. Birdo didn't take it kindly.
- Recurring Boss: Fought four times in Superstar Saga and twice in Minion Quest. With those and the fight in Dream Team, he is fought seven times, more than any other boss in the series except for Bowser, who is a boss in some way for thirteen unique fights as of Paper Jam.
- Slasher Smile: His default expression. It turns into a slasher scowl when he's angry.
- Thief Bag: Carries one. In battle he uses it to throw random stuff at Mario and Luigi.
- Took a Level in Jerkass: He was never kind to his rookies, but as of Dream Team he puts them in harm's way to save his skin, then betrays them when the opportunity strikes. Of course, since this time his "rookies" are the Mario Bros. themselves, it doesn't end well for him.
- Undying Loyalty: Inspires this from his Rookies, both become furious if he's attacked. One has to wonder why, though.
- Unwitting Instigator of Doom: Inadvertently set the second half of Superstar Saga into motion by trying to claim the Beanstar.
- Verbal Tic: Tends to punctuate his sentences by saying "see," see?
- Video Game Stealing: Capable of stealing the hammers out of the Bros.' hands.
- When All You Have Is a Hammer...: His attacks are limited to tackling, stealing, and throwing loot. Dangerous enough against the Mario Bros., but completely useless against a Wiggler.
- Yellow Eyes of Sneakiness: A very sneaky jackass of a thief, with the yellow eyes to match.
A Spike who rules over the Stardust Fields, the border between the two kingdoms. After Bowser's Koopa Cruiser is brought down by Fawful, The Koopa King lands in one of Tolstar's cannons. He asks for a bribe in return for not telling anyone about the incident, but since the Mushroom Kingdom's currency exchange rate is low, the Bros. have to scour the Fields to scrounge up enough money.
- Arc Villain: He keeps Mario and Luigi from exiting Stardust Fields, indirectly causes Bowser's amnesia (Although in Minion Quest it wasn't even strong enough since Bowser was just sent flying and is knocked out but still had his memory), and vouches for the Bros. to the Beanbean soldiers, then is not heard from for the rest of the game.
- Authority in Name Only: Claims to be the king of Stardust Fields, but has no legal authority and is opposed by the Starshade Bros.
- Comical Angry Face: When angry, he puffs out his cheeks and his eyes go blank.
- Evil Laugh: "Nyeck nyeeck nyeeeeck!" Not only is he one of few characters to have a distinct laugh, it's also an attack indicator.
- Exact Words: He said he wouldn't tell anyone about Bowser's predicament if he got 100 coins. He never said he'd let the Bros. pass.
- Fat Bastard: He mocks Bowser for getting stuck in his cannon and refuses to help him out unless the Mario Bros. pay him 100 Beanbean coins. Even after the bros. do give him the coins, he double-crosses them and attacks them.
- Flight: He is somehow capable of this despite the fact that his wings look way too small to lift him.
- HeelFace Turn: Of a sort. After being beaten by the Mario Bros., he shows up later to vouch for the Bros. to the Beanbean soldiers to help let them through, despite not appearing to have any motivation for this.
- Slasher Smile: He gets a particularly good one whenever he laughs, complete with blank happy eyes.
- Spike Balls of Doom: His method of attack.
- Starter Villain: The first real threat that the Mario Bros. face in the game, and his defeat allows the Mario Bros. to properly get into the Beanbean Kingdom at last.
- Suspiciously Similar Substitute: He is heavily based on Spikes from Super Mario Bros. 3, given his appearance and his attacking method of throwing spiked balls.
- Warm-Up Boss: He's the first "real" boss of the game; more specifically, he's the first boss who isn't a tutorial boss, and the first one to have boss music.
A fairy-like child found in Joke's End. She harasses the Mario Bros. throughout the place, culminating in a battle with her and a friend of hers.
- An Ice Person: She can freeze the Bros, or unleash a blizzard in the middle of battle.
- Arc Villain: For the majority of Joke's End, she gets in your way.
- Barrier Change Boss: Not Jojora herself, but her friend periodically changes hair colors, also changing her elemental weakness - blonde for Firebrand and pink for Thunderhand. Hitting her with the wrong one heals her.
- Cowardly Boss: Counter her staff attack and she'll leave the battle for a few turns.
- Dual Boss: With her friend.
- Glacier Waif: You wouldn't expect the dainty fairy girl to only take only 1 damage from every attack. Averted in the remake.
- Magic Wand: Her weapon. Knocking it away causes her to flee the battle temporarily in order to retrieve it.
- Psychopathic Manchild: She considers dragging the Mario Bros. through the inhospitable Joke's End and inviting her friend to pulverize them a game, and throws a tantrum upon losing.
- Skippable Boss: If you defeat her friend first, she'll throw a fit and leave.
- Stone Wall: Her defense is massive. Anything that isn't an Armor-Piercing Attack or Spam Attack will deal 1 point of damage. Fortunately her HP total is low, and defeating her is optional.
- Zig-zagged in the remake. Her defense is no longer maxed out but is still roughly 3 times higher than her friend's. As a trade-off her HP is now ten times higher being 500 instead of 50. Defeating her is still optional.
- Support Party Member: Jojora's friend is the real boss, but while Jojora herself is on the field, she will counter any attack done to the friend. This counter-attack is not only very difficult to avoid, but heals both herself and the friend.
A living mechanical suitcase created by Professor E. Gadd to help Mario and Luigi on their quest and to hold all their items.
- Armless Biped: He's basically a suitcase with legs and a face.
- Bag of Holding: He can hold an absurd amount of materials. Made most apparent with the Cobalt Star, which has a graphical field sprite even bigger than his despite it being stored within him for most of the game.
- Borrowed Catchphrase: At one point in Paper Jam Starlow uses his "BACK TO ADVENTURE!" phrase, complete with shouting it right as a cutscene ends and control is returned the player.
- Catchphrase: "BACK TO ADVENTURE!"
- Chuck Cunningham Syndrome: Went MIA after Starlow took over as the Exposition Fairy.
- Exposition Fairy: Specifically designed as such by Professor Gadd.
- Neologism: His main speech quirk is a tendency to take at least two words, either of which would be appropriate for a certain context, and then combine them into some new word.
- Point of No Return: Subverted thanks to him. During the endgame, he warns you that it's the point of no return, but at any save point thereafter, he gives you the option of going back in time to before you passed the point, giving you the option to go and get better prepared.
- Sesquipedalian Loquaciousness: Prone to this. He'll even go as far as to make up words that sound complex but are merely extensions of simpler words.
- Waddling Head: Inasmuch as his body can be considered a "head."
A friendly, spunky Koopa Troopa who the Mario Bros. first meet as a reporter for the Koopa Kronicle covering the ongoing Shroob Invasion while also helping the plumbers in their fight against the invaders. She returns in Dream Team as a tourist guide writer who tasks the Bros. with retrieving pictures from the Camera Blocks she scattered across Pi'illo Island.
- Action Girl: She's definitely not afraid of throwing herself into the fray to earn herself some scoops.
- Big Damn Heroes: She saves the Mario Bros. from Princess Shroob and her underlings by disguising herself as one of them and blasting every other Shroob in the room with one of their own ray guns.
- The Bus Came Back: She returns in Dream Team after a seven-year absence.
- Intrepid Reporter: She cheerfully treks across the Mushroom Kingdom recording every possible scoop concerning the Alien Invasion.
- Killed to Uphold the Masquerade: She got turned into a Shroob mushroom by the Elder Shrooboid before she could reveal the true nature of the Cobalt Star.
- Older Than They Look: She doesn't appear to have aged a day between Partners in Time and Dream Team despite at least a 30 year time gap. Justified since she's a Koopa, which are turtles.
- Seen It All: Upon meeting her again in Dream Team, Mario and Luigi try to remind her of her helping them during the Shroob Invasion when she was a reporter, only for her to state that she's had too many jobs to remember that one in particular. That's right, her life has been so eventful that witnessing the near-destruction of the Mushroom Kingdom by alien invaders and getting turned into a mushroom were all comparatively unmemorable.
- Species Surname: Kylie Koopa the Koopa.
- Swallowed Whole: By Petey Piranha.
- Tagalong Reporter: She follows the Mario Bros. around knowing that they're Shroob magnets.
A female Toad who accompanied Princess Peach and Toadbert in Professor Gadd's time machine. She was promptly captured by the Shroobs to have her vim extracted. She is found being drained by a tree in Toadwood Forest, where she tell the Mario Bros. about the Vim Factory before being turned into a Shroob Mushroom.
- Baleful Polymorph: She spends most of the game Shroobified.
- Chuck Cunningham Syndrome: Not seen in the sequel.
- Pink Girl, Blue Boy: The pink to Toadbert's blue.
- Sacrificial Lamb: Her character exists almost entirely to establish how evil the Shroobs are and how their actions will affect everyone if they are not defeated quickly. Even though she recovers later.
A spectacled Toad who accompanied Princess Peach and Toadiko in Professor Gadd's time machine. He escapes the Shroobs but loses his memory. He is later found inside Yoob's gut on Yoshi's Island, where he shows the Mario Bros. a sketch of his he was able to draw before his amnesia. He reappears in Bowser's Inside Story as one of the Toads who got inhaled by Bowser.
- Amnesia Danger: His amnesia keeps him from telling the Mario Bros. of the important info about the sketch that has him so spooked. He gets Shroobified right after regaining his memories, only able to tell the Bros. to clean off the image but without being able to explain the full significance of it.
- Demoted to Extra: He's not nearly as important to the plot in Bowser's Inside Story as he was in Partners In Time.
- Expy: He's very similar to the character of Russ T. from the original Paper Mario.
- Killed to Uphold the Masquerade: He got Shroobified by the Elder Shrooboid before he could reveal the true nature of the Cobalt Star.
- Pink Girl, Blue Boy: The blue to Toadiko's pink.
- Verbal Tic: He certainly has one, by boogity!
Mr. and Mrs. Thwomp
A Thwomp couple who have traveled to Thwomp Volcano to witness its yearly eruption; when they find the Mario Bros. are more or less responsible for the volcano being quenched, Mrs. Thwomp gets mad and attacks them. Once she calms down, Mr. Thwomp helps them into Thwomp Caverns by acting as an elevator. While Mr. Thwomp looks just like a regular Thwomp, Mrs. Thwomp looks like a round boulder with arms.
- The Smurfette Principle: Mrs. Thwomp is one of the few female Thwomps anywhere in the franchise.
Gramma Red and Gramma Green
Two elderly Toad merchants who maintain an item shop in the middle of a Shroob-infested Toad Town.
- Recurring Element: They have the same "red elder, green junior" motif as the Mario Bros. and all the other sibling pairs in the series.
Star Shrine Gate
A sapient gate who keeps the unworthy out of the inner depths of the Star Shrine.
A militant race of mushroom-like aliens who abandoned their dead, barren planet in favor of greener pastures, laying their eyes on the Mushroom Kingdom of the past. When they attacked Peach's Castle while the adult Princess Peach happened to be visiting in E. Gadd's time machine, they took her prisoner, driving the Mario Bros. to travel back in time and team up with their younger selves in order to defeat the invaders.
- Alien Among Us: Apparently, some shroobs either managed to evade the Koopa Troop or escape from their confinement in Bowser's Castle. One appears in Fawful Theater's audience in Bowser's Inside Story, and what appears to be an "alien sighting" picture appears in Dream Team.
- Alien Invasion: They successfully invade and conquer the Mushroom Kingdom of the past.
- Aliens Are Bastards: They take great joy in commiting numerous acts of dickery over the course of the game.
- Aliens Speaking English: Averted, except in the case of Elder Princess Shroob, who can speak normally (but in ALL CAPS).
- Always Chaotic Evil: There is not a single Shroob that isn't evil, with the possible exception of the harmless one in Fawful Theater in Bowser's Inside Story.
- Arc Words: The Shroobs speak a certain phrase constantly. You eventually find out it means "DESTROY!"
- Badass Moustache: Shroobsworth.
- Black Eyes of Crazy: Glowing eyes in deep black pits.
- Bonus Boss: Bowser's Inside Story has a hidden boss fight against three Shroobs in Bowser's Castle. Defeating them rewards the Mario Bros. with a powerful special attack, Magic Window.
- Cyborg: RC Shroobers.
- Deadly Doctor: Doctor Shroobs.
- Dying Race: Their planet was apparently on its last leg.
- Everything's Better with Spinning: They and their sub-species have a habit of doing this.
- Evil Counterpart:
- The species in general to the Toads, and Princess Shroob and Shroobsworth to Peach and Toadsworth (though Shroobsworth is a regular enemy rather than a plot-centric character).
- Shroobsworth also counts as one for the Marios, as his fighting style involves combo attacks using a smaller Shroob.
- Fast Tunnelling: Shrooba Divers, encountered in the Gritzy Desert, swim through the sand as if it were water.
- Flying Saucer: They have vast fleets of UFOs.
- The Goomba: Shrooblets are the weakest enemies in the game. They're even shaped more like Goombas than other Shroobs.
- Great Offscreen War: Implied to have had one with the Koopa Troop in the interim between Partners In Time and Bowser's Inside Story. They lost.
- Hopeless Boss Fight: Adult Mario and Luigi vs. three Shroobs near the beginning of the game. The Shroobs are aided by a giant bomb-carrying UFO that destroys the brothers after three turns, making the fight impossible to win. The babies pay them back later.
- Human Popsicle: In Bowser's Inside Story, numerous Shroobs can be found frozen in Bowser's basement.
- Killed to Uphold the Masquerade: The Shroobs have a chronic habit of Shroobifying anyone who tries to reveal the secret of the Cobalt Star.
- Kill It with Ice: All Shroobs take extra damage from the Ice Flower. This is later referenced in Bowser's Inside Story, where a slew of them are kept in Bowser's cold storage.
- Knight of Cerebus: The Shroobs are terrifying monsters that wreak devastation on the Mushroom Kingdom. They are largely played seriously as a threat, and their cruelty is what makes Partners in Time a contender for the darkest game in the Mario series.
- Man on Fire: The heads of Blazing Shroobs are on fire. Mario and Luigi will take damage if they jump on them, but doing so extinguishes the flame, making them much less dangerous.
- Mecha-Mooks: Shroids, robots shaped like Shroobs and prone to malfunctioning after taking too much damage.
- Omnicidal Maniac: DESTROY!
- Ray Gun: Their main weapons.
- Red Eyes, Take Warning: Most Shroobs have creepy red eyes.
- Rock Beats Laser: The life-sucking mushrooms they plant around the Mushroom Kingdom can be disabled by a baby crying on them.
- Take Over the World: And by the time the Mario Bros. arrive, they've already succeeded.
- Technopath: RC Shroobers can sprout antennae to direct radio-controlled bombs and minature UFOs.
- Underground Monkey: Various "Shroobified" enemies.
- Vile Villain, Saccharine Show: They are responsible for some very nasty acts.
- What Happened to the Mouse?: Yoob and Junior Shrooboid seem to have been forgotten.
- Wingdinglish: Their language is made up of a bunch of bizarre glyphs.
The main antagonist of Partners In Time. She led the Shroob invasion of Mushroom Kingdom in a bid to find a new home for her race as theirs was in danger or dying. When Princess Peach traveled in time to visit the Mushroom Kingdom, Princess Shroob captured her in a bid to take over the Mushroom Kingdom of the present, an act that unfortunately put her in the crosshairs of the Mario Bros.
- A Glass of Chianti: As the picture shows, she is occasionally seen drinking a strange beverage.
- Aliens Speaking English: Averted. Like the rest of the Shroobs, she speaks their language. Though at later points of the game, her speech is translated via parenthesis.
- Authority Equals Asskicking: She's the Princess of the Shroobs, and as such one of their most dangerous members.
- Ax-Crazy: Next to Dimentio, she's possibly the most psychopathic villain in the Mario series.
- Big Bad: The leader of the Shroobs, and thus, the main antagonist. Her older sister, the actual leader, was sealed inside the Cobalt Star by Peach, so she takes over until her death.
- The Chessmaster: Princess Shroob is very thorough with her plans for conquest. She anticipates the Bros.' movements and plans ahead for countermeasures like how they would try to rescue Princess Peach in Gritzy Caves while she was disguised as her to conquer the kingdom in the present and how if all else failed to terminate the brothers and she would get defeated, made sure the front gate of Shroob Castle would only open with the other five Cobalt Star shards imprisoning her sister.
- Dark Action Girl: She controls a giant mech which she uses to try to kill the Mario Bros.
- Dragon Ascendant: Takes over the invasion of the Mushroom Kingdom after her sister is sealed in the Cobalt Star.
- Energy Ball: Most of her attacks involve throwing these at the Bros.
- Evil Counterpart: She is to the Shroobs what Peach is to the Toads.
- For the Evulz: Desperation to find a new home for your Dying Race is one thing, but she also commits and directs various actions that seem motivated by pure sadism.
- Frickin' Laser Beams: Her throne is equipped with these.
- Giggling Villain: Lets out a pretty creepy giggle when things go her way.
- God Save Us from the Queen!: Although she is referred to as a princess, the principle's still the same.
- Hair-Trigger Temper: Princess Shroob has a bit of a short fuse and gets mad when things don't go her way. And when the gang shoots down her mothership and destroys the tower made in her image, she completely loses it.
- The Heavy: Though her sister is the true leader of the Shroobs, Peach's intervention meant that she was the one to spearhead the invasion effort.
- High Collar of Doom: Her dress is distinguished from Peach's by a pronounced collar, befitting her villainy.
- Knight of Cerebus: She lacks comedic traits and not only manages to take over the Mushroom Kingdom of the past, but very nearly does the same to that of the present.
- Lack of Empathy: Feels no remorse for any of the things she's done, and doesn't seem to have any love for her sister as she made no attempt to free her from the Cobalt Star, nor showed any indication that she intended to.
- Malevolent Mugshot: There are statues of her in Shroob Castle.
- Mask of Sanity: At first glance, one has the impression of a calm, controlled ruler. But hidden just below the surface is a sadistic, psychopathic monster that's waiting to be released. And once Mario and co. shoot down her mothership, the mask comes off.
- Opera Gloves: She has long white gloves to match Peach, though hers are a lot...sharper.
- Princesses Prefer Pink: Princess Shroob wears a pink dress much like Peach's.
- Royals Who Actually Do Something: She actually leads the invasion on Mushroom Kingdom, and even disguises herself as Peach to invade the present Mushroom Kingdom.
- Sadist: Has a penchant for watching others suffer.
- Shielded Core Boss: In the battle with her, she is protected by a shield that needs to be destroyed before she can be attacked.
- The Sociopath: Manipulative, impatient, and very sadistic, she has zero empathy for anything or -one but herself (even her sister) and doesn't care who she hurts as long as she gets her way.
- Teleport Spam: Does a lot of this during her boss fight.
- Trojan Horse: She disguised herself as Peach with a Shroob mushroom stuck on her face in order to infiltrate the Mushroom Kingdom of the present. Had Bowser not kidnapped her, this plan would have succeeded.
- Turns Red: When down to half health, Princess Shroob will glow red and her attacks become faster and more dangerous.
- The Usurper: She didn't even try to recover the shards of the Cobalt Star to release her sister from imprisonment but did hold one at the factory. It's not crazy to believe she wanted to rule the kingdom without her sister around and found the opportunity to do it when Peach did the move.
- Vile Villain, Saccharine Show: It's quite jarring to encounter a villain as psychopathic as her in a Mario and Luigi game.
- Villainous Breakdown: When the Mario Bros. destroy her Mothership so it destroys the tower in Shroob Castle made in her image, she emerges from the wreckage furiously declaring that Peach is useless, the kingdom is hers, and she'll destroy everyone."NOW YOU'VE DONE IT! YOU'RE USELESS NOW, PEACH! TIME TO FINISH YOU! YOU CANNOT ESCAPE! THIS KINGDOM IS MINE! I WILL DESTROY YOU ALL!! DESTROY!!!"
- Attack of the 50-Foot Whatever: It starts off pretty big, then gets really big once the Shroobs power it up.
- Make My Monster Grow: It was already large, but eventually the Shroobs zap it with a laser to make it much larger.
- Overly Long Tongue: Being the Shroob version of a Yoshi, it's only natural that it would have one of these.
- Portmanteau: Of "Yoshi" and "Shroob".
- Swallowed Whole: It does this to the Yoshis, Baby Bowser, and both pairs of Mario Bros.
- The Unfought: Yoob itself is never actually fought at any point. A fight with giant-sized Yoob wouldn't have worked out since giant battles hadn't been introduced yet, but you don't even fight it when it's normal size. Instead, the bros. get eaten, explore its insides, stop the production of its eggs by defeating Sunnycide, and it simply ceases functioning, never to reawaken.
- Womb Level: The Mario Bros. have to traverse its innards to rescue the Yoshis and find the Cobalt Star shard.
Elder Princess Shroob
The actual leader of the Shroobs and the sister of Princess Shroob. She and her sister led the Shroob invasion in a bid to find a new home for her race. During which they encountered Princess Peach, who traveled to the past. Peach managed to seal her in the Cobalt Star before being captured herself.
- Aliens Speaking English: She's the only member of the Shroobs who speaks English, though it is IN ALL CAPS.
- Authority Equals Asskicking: The supreme leader of the Shroobs, and the game's most powerful foe.
- Bad Boss: Elder Princess Shroob has no problem shooting or knocking down her minions' UFOs.
- Cognizant Limbs: In her second form, her leg tentacles, arm tentacles, body, and crown are all separate targets.
- Combat Tentacles: Used by her final form.
- Counter Attack: In the JP/EU versions of the game, in her first form she immediately responds with her shoulder tackle attack every time she takes damage.
- Even Evil Has Loved Ones: Despite being an even bigger monster than Princess Shroob, Elder Princess Shroob indicates that she thinks positively of her, complimenting her late sister and declaring that she will avenge her right before the battle.
- Evil Counterpart: The eviler Shroob counterpart to Bowser, what with her hulking build, her position as ultimate leader, and her Bad Boss tendencies towards her minions to contrast Bowser's more benevolent attitude.
- Final Boss: Of Partners In Time. While there's one more battle after this one, it's rather short and simple on top of being more of a minigame than an actual battle, whereas the Elder Princess Shroob is the last major challenge in the game, thus making her this.
- Foreshadowing: Kylie Koopa and Baby Luigi were able to sense something was wrong with the Cobalt Star.
- God Save Us from the Queen!: Although she is referred to as a princess, the principle's still the same.
- High-Altitude Battle: She is fought atop a flying platform in the sky above Shroob Castle.
- Hypocritical Humor: Refers to Toads as "STUPID MUSHROOM HEADS".
- Knight of Cerebus: She does not play or joke around once she takes center stage.
- Lack of Empathy: Just like her sister. She'll casually smack her own people aside as soon as they've done her will.
- Large and in Charge: Even before turning into a humongous tentacled monstrosity, she has a very heavy, muscular-looking build compared to her relatively dainty sister.
- Manipulative Bitch: Masquerades as the benevolent spirit of the Cobalt Star to trick the Bros. into freeing her. Peach told them the real story but she still managed to be released thanks to Baby Bowser.
- No Indoor Voice: Considering her text is in ALL CAPS, it's not hard to imagine that everything she says is shouted.
- One-Winged Angel: For her second phase, she transforms into a giant, tentacled monster.
- Princesses Prefer Pink: Just like her sister, she wears a pink dress.
- Roar Before Beating: She roars after going One-Winged Angel.
- Sealed Evil in a Can: Princess Peach had her sealed away in the Cobalt Star. As seen in Bowser's Inside Story, her remains were frozen and locked away by Bowser along with the other Shroobs.
- Sequential Boss: Two phases, one in her regular form and the second is her One-Winged Angel.
- Sealed Evil in a Six Pack: Sealed away by Peach in the Cobalt Star which is then broken into six pieces.
- Shielded Core Boss: All attacks directed at her body (which is the main target) will do 1 damage until her crown is destroyed. On top of that, her crown cannot be targeted until her leg tentacles are destroyed. Both of these will regenerate after a few turns.
- Stronger Sibling: She's much stronger than Princess Shroob- she doesn't even need a machine to fight!
- Time Master: Can rip open Time Holes.
- Transformation Trinket: Her crown, which she activates in order to go One-Winged Angel. It's also a Cognizant Limb which prevents the transformed princess from taking anything more than Scratch Damage from any given attack until its taken out.
- Unexplained Recovery: It's never explained how she got out of Bowser's stomach in Bowser's Inside Story.
- Walking Spoiler: Her very existence is a plot twist.
A little yellow ball of a creature who is sent to assist Princess Peach and the Mario Bros. as a representative of the Star Sprites, the beings who watch over the Mushroom Kingdom. In Dream Team, she is also sent to represent the Star Sprites on Pi'illo Island, though how exactly is never specified. Whenever Mario heads into the Dream World, she stays behind to do things to Luigi like pull his mustache and tickle his nose in order to alter things in the dream. While she is openly annoyed by Luigi's cowardice, she gradually warms up to him as she sees more examples of his heroism.
- Armless Biped: And handless and legless too. She's basically a floating ball with feet and a star.
- Black Bead Eyes: What her eyes normally are, with eyelashes to indicate her gender.
- Blank White Eyes: When shocked by something.
- Borrowed Catchphrase: Uses Stuffwell's "BACK TO ADVENTURE!" phrase at one point in Paper Jam.
- Breakout Character: Since her debut, she has gone on to appear in all subsequent Mario & Luigi games in some capacity.
- The Cameo: She appears in the Minion Quest scenario, first as Hermie's captive, then as a contestant in Wendy's pageant.
- Comically Missing the Point: When one Pi'illo makes mention of her being nude, she angrily replies "OPEN YOUR EYES! I have SHOES!"
- Exposition Fairy: To the Mario Bros. and Bowser.
- Guile Hero: It was only through her lying to Bowser that the latter would even bother doing some heroic things in Bowser's Inside Story, let alone that Bowser was inadvertently helping his nemeses out. At one point Bowser actually had to ask for her help so he can remember the combination to his safe, and Starlow refuses to comply until Bowser, very reluctantly, asks her again by saying the magic word, "Please".
- Hair-Trigger Temper: She gets angry rather easily. Then again, she does go through quite a bit of abuse over the course of the games.
- Hidden Depths: Knows powerful magic involving the use of Pure Energy. Hinted at within several games and outright proven in Mario & Luigi: Paper Jam when she decides to use her abilities offensively and used "Supernova Sparkle" onto Ludwig and Larry (and accidentally the Mario bros) in an Offscreen Moment of Awesome.
- Interspecies Friendship: Is good friends with Peach, Mario and Luigi.
- Jerk with a Heart of Gold: This element of her personality is most apparent in her dealings with Luigi. In Dream Team, she initially expresses frustration with his Heavy Sleeper habits (partly out of jealousy that he can sleep so easily, and partly because him falling asleep on Dreambert led to Peach getting kidnapped in the first place). However, she shows concern for him later on when he is forced to sleep on the frigid summit of Mount Pajamaja, lighting the nearby furnace to keep him warm and demonstrating that she does ultimately care for his well-being.
- Little Miss Snarker: She's rather sassy with various characters, especially Luigi and Bowser.
- Meaningful Name: Starlow is a portmanteau of "star" and "yellow". Her Japanese name is literally "Yellow Star".
- Mission Control: In Dream Team, for some reason she doesn't join any excursions into the dream world and stays behind to watch over Luigi instead. Anything she does to Luigi in the real world helps out Mario and Dreamy Luigi in various ways.
- Never Say "Die": "YOU GOT A KO WISH?!"
- Pure Energy: With Peach, she is able to use an ability called 'Wish Power' which, in Bowser's Inside Story, helps weaken Bowser in the tutorial fight and in Dream Team, stops Bowser from obliterating the Mario Bros. with the Dream Stone. She also uses an attack called "Supernova Sparkle" in Paper Jam when the team get blocked by Ludwig and Larry on their way to Bowser's Castle. It shouldn't be used in enclosed spaces though, considering how the bros. come out of the Warp Pipe rather dazed.
- Tertiary Sexual Characteristics: She is only visually distinguishable as female thanks to the long eyelash marks on her beady eyes. However, these eyelashes aren't visible on her in-game sprite and dialogue references to her as female are surprisingly few in number. During Dream Team, you can see the eyelashes when she's Luigi-sitting.
- Took a Level in Kindness: In Bowser's Inside Story, she is really quite blunt, almost to the point of rudeness, and insulting towards Luigi, questioning his abilities as a hero. In Dream Team, she has warmed up considerably towards him even though she still gets frustrated with him at times and in Paper Jam, Starlow is very much amiable towards Luigi even giving him a pep talk at one point.
- Two Aliases, One Character: She adopts the name "Chippy" for her dealings with Bowser in Bowser's Inside Story. Played with since the player always knows they're the same person, only Bowser doesn't.
- Voice for the Voiceless: Acts as this for Mario & Luigi and has, at this point, adopted herself as their official guide.
- Waddling Head: Well, the "waddling" part is absent, considering that she spends the whole time flying around, but she still fits the "round object with feet" part of the trope.
A member of the Brock race, who resemble the Blocks frequently seen in the Mario games, Broque is a block collector who has set up a shop in the Mushroom Kingdom where Bowser can buy stuff. In contrast to most other good characters in the Super Mario Bros. franchise, he is not friendly to the Mario Bros., as he disapproves of their block-hitting escapades. He returns in Dream Team as the head of Pi'illo Island's tourism business, where he is slightly more amicable toward the plumbers. In public at least.
- Badass Mustache: Has two which can double as eyebrows thanks to his odd detachable head.
- Big Ol' Eyebrows: His mustache becomes this when he flips his head over.
- French Jerk: Subverted; he's generally a Nice Guy and is only callous towards the Mario Bros (he even apologizes to them immediately afterward).
- Gratuitous English: In the Japanese version ("Oh my dog! What's happen!").
- Gratuitous French: In the English version.
- Losing Your Head: He takes it off◊ in order to go from one expression to another. Also, when his Mega Mushroom attack is countered.
- Punny Name: His name is combination of "block" and "croque-monsieur." Other translations make his name some sort of block pun, such as the European Spanish version naming him "Charles Bloquette" after Charles Martinet.
- Right Behind Me: In Dream Team, you can walk in on him ranting about the Mario Bros. to his coworkers because he doesn't like the fact how they keep bashing blocks and devaluing them.
- Training Boss: He willingly lets Bowser wail on him and suck him up to teach him the Vacuum Block mechanics.
Broque Monsieur's rather ferocious cubical dog.
- Angry Guard Dog: He is Bowser's final special attack in Bowser's Inside Story. He also acts this way towards the Mario Bros.
- Demoted to Extra: In Bowser's Inside Story, he's a Training Boss, the cashier of Bowser's gear shop, and Bowser's final special attack. In Dream Team, he appears briefly to invite the Mushroom Kingdomites to Pi'illo Island before disappearing entirely.
- Infinity +1 Sword: Bowser gets him as a special attack if he delivers all of the Blitties to Broque Monsieur's shop.
- The Last of These Is Not Like the Others: Bowser's list of special attacks include Koopas, Goombas, Shy Guys, Magikoopas and Bob-ombs. The last one is Broggy and his Blitties, who is not a member of his minions.
- Perpetual Frowner: He never smiles and growls at anything that gets near him.
- Robot Dog: Implied by him having a communication screen on his back, assuming that wasn't also part of Luigi's dream.
- Training Boss: Broque tells Bowser how to use his fire breath on Broggy to subdue him.
- What Happened to the Mouse?: In Dream Team, you'll never see him again after the intro, though Kylie still managed to get a picture of him.
The Elite Trio (Private Goomp, Corporal Paraplonk, and Sergeant Guy)
A Goomba, a Paratroopa, and a Shy Guy who escaped Fawful's brainwashing of the Koopa Troop. They return in Dream Team having been promoted and carrying out Bowser's orders almost as much as Kamek.
- A Day In The Lime Light: While they're not necessarily the main characters in Minion Quest: The Search for Bowser, they play integral roles in the plot as well as both friendly units and bosses.
- BFG: Sergeant Guy mans a pretty big Bullet Bill cannon in the boss battle with the Elite Trio in Dream Team. This was also what they (and Bowser) tried to use in order to launch an attack against Bowser's Castle in Bowser's Inside Story.
- Brainwashed and Crazy: Averted; they join Fawful of their own will. Twice! Although Private Goomp was only brainwashed once.
- Bucket Helmet: Corporal Paraplonk.
- Chromatic Arrangement: Formed via the green-robed Sergeant Guy, the red-shelled Corporal Paraplonk, and the blue pajama-clad Private Goomp.
- Chronic Backstabbing Disorder: Despite being loyal to Bowser, they have defected to Fawful twice, once to spite Captain Goomba, and the other time because Fawful promised them with rations. In the fourth game, they have learned their lesson well.
- Climax Boss: In Dream Team, where they're fought in Dreamy Driftwood Shore after revealing that the real Peach was kidnapped all along.
- Deadly Dodging: True of all enemies, but their giant Bob-Omb attack deserves special mention since it is easy to dodge and deals massive damage even to themselves. It is quite probable players will win the battle simply by letting them KO themselves with that move.
- Doppelgänger Attack: Sergeant Guy can use his magic rod to transform the Goombas under Private Goomp into identical copies of himself, who will run around in an attempt to confuse Mario and get some hits in. It's stopped at the end, or if you manage to hit the real Sergeant Guy.
- Easily Forgiven: Bowser allows them back into the army assuming that they pull their weight in defeating Mario. In Bowser Jr.'s Journey, the same was not said to the few Goombas in a post-game cutscene.
- Et Tu, Brute?: They betray Bowser in Bowser's Inside Story, and the ending confirms that they did it willingly.
- Exposition Fairy: Corporal Paraplonk acts as this during the first Giant Bowser Battle.
- HeelFace Revolving Door: They start out on Bowser's side, defect to Fawful willingly (Twice even), then defect back (Twice again), only to collectively try to become The Starscream in Dream Team, then give up that idea after the Mario Bros. deal them a sound thrashing.
- Iconic Outfit: Crossed with The Artifact. Goomp's pajamas, Paraplonk's Bucket Helmet and Sergeant Guy's backpack of whatever the heck he could grab before fleeing were originally used to indicate that they had been caught off guard by Fawful's takeover, yet they're still wearing those items (now decorated with Bowser's insignia) in Dream Team, where they would've had plenty of time to scrounge together something more practical.
- The Medic: Corporal Paraplonk, who regularly heals his comrades with mushrooms during the battle with them.
- Mighty Glacier: In Dream Team, Sergeant Guy has the most HP and POW, but is the slowest of the bunch.
- Pajama-Clad Hero: Seems to be the case with Private Goomp, who is always seen with blue pajamas and nightcap.
- Puzzle Boss: You have to defeat all three at the same time to win the boss battle.
- Rank Up: They all are promoted to Elite rank in the army as of Dream Team. This doesn't last too long once they're trounced by Mario and Luigi. Hell, they even ditch their "Elite" equipment for their less-surprising equipment when you see them again.
- Shell Game: One of Sergeant Guy's attacks in Dream Team is to transform the Goombas into clones of himself and then join them in a Zerg Rush against Mario. The attack can only be stopped by having Mario hit the Sergeant (told apart from his clones by having a larger flag with Bowser's logo on it).
- Shout-Out: Their ranks and coloration are the same as three characters in Sgt. Frog (respectively Tamama, Giroro and Keroro).
- Stone Wall: In Dream Team, as befitting a Paratroopa, Corporal Paraplonk is the fastest of the group and also has the highest defenses in battle.
- The Reveal: Turns out Private Goomp was one of the two Goombas aboard the Koopa Cruiser alongside Captain Goomba in Superstar Saga.
- The Starscream: Believe they can be promoted to above Bowser if they win against Mario in Dream Team. Of course, it's Played for Laughs.
- Took a Level in Badass: In Dream Team, they're promoted to elites and they fight the Mario Bros. Minion Quest and Bowser Jr.'s Journey also shows they got their experience of fighting through battles with Captain Goomba and Bowser Jr.
- Wolfpack Boss: Combined with Flunky Boss in Dream Team.
A strange being who claims to control Bowser's mucus membranes.
- Honest Axe: She asks Mario if it was Luigi or "a treasure of e'erlasting wonder" that he dropped in the mucus. When Mario chooses his brother, she gives the the treasure anyway — the Good Badge and Mushroom Badge, plus a Tenderling enemy to try them out on.
- The Royal We: She refers to herself in the plural which, combined with her title and slightly antiquated speech, is clearly meant to evoke this trope.
A caterpillar creature resembling both Wiggler and Birdo that causes Bowser extreme pain after he accidentally swallowed it while eating the Giga Carrot, forcing Mario and Luigi to attack it. Later revealed to be Wisdurm, one of the Star Sages holding a Star Cure.
- Big Creepy-Crawlies: Her natural form isn't significantly larger than a typical caterpillar, but the giant form she takes when fighting Mario and Luigi is easily as tall at the "shoulder" as the brothers are from head to foot.
- Chekhov's Gunman: No one would have guessed she was a Star Sage during her first appearance.
- Cute Monster Girl: Particularly as Wisdurm, being pink with stars in her eyes and even crying briefly when Mario and Luigi nullify her attacks as though she is hurt (emotionally and/or physically) by their actions.
- Heart Beat-Down: She can conjure a heart-shaped stone during her second fight. The image on it signifies which of the Bros it's going to hit.
- Heart Symbol: Has a lot of these in general. Even as Durmite, her siphoning straw is bent in the shape of a heart.
- Interface Screw: During her star attack in the second fight, she can switch Mario and Luigi's positions to confuse the player.
- Magic Wand: She uses one during her second fight with the Mario Bros.
- Make My Monster Grow: When first encountered, she swallows the Biffidus to grow larger. In her second fight, this is done by attacking her small form, which fills the bar/magic wand on the top screen.
- Sizeshifter: She can change size at will, and one of her attacks is to shrink one of the Bros and trample them.
- Verbal Tic: She has a tendency to slurrrr certain worrrrds.
- What Happened to the Mouse?: After giving the Mario Bros. the Star Cure, Wisdurm disappears and isn't even shown exiting Bowser's body at the end.
A Toad doctor who tries to find the cure to the mysterious disease plaguing the Mushroom Kingdom.
- Big "YES!": He has this as a voice clip.
- Bunny-Ears Lawyer: He has some awfully bizarre habits for such a renowned doctor.
- Crystal Ball: He has one that can see where the Star Cures are located, though the vision of Bowser turned out to just be Bowser himself reflected in the glass.
- Eccentric Mentor: Is he the one to guide you in your quest? YES!
- Insistent Terminology: He insists that the Miracle Cure be called the Miracle Toadley Cure.
- Qurac: His expertise in medicine is somewhat implied to come from an Eastern origin, namely by his eccentricity, unusual manner of speech, and, most significantly, his stereotypically Arabian garb, including a face veil, large hoop earrings and a Toad hat that resembles a turban.
- Retcon: In the remake of Superstar Saga, he replaces Psycho Kamek.
- Verbal Tic: Does he like to speak in the form of questions and answers? He does.
A lovelorn female Brock with some very bad back problems. She and Broque Monsieur once dated.
- Ascended Extra: In Bowser's Inside Story, her only purpose is to give an optional sidequest for Bowser. In Dream Team, she helps hide Peach from the Big Bad Duumvirate and also owns a very posh shop. In the remake of Bowser's Inside Story, she serves as a boss in Bowser Jr.'s Journey and she is the only person able to mix the ingredients to make Skeletone Formula:D.
- Attack of the 50-Foot Whatever: She becomes really big in Luigi's Luiginary Attack dream challenges.
- Big Beautiful Woman
- Flying Brick: Literally. She's a Flying unit in Bowser Jr.'s Journey, and has very large amounts of health.
- Me's a Crowd: Each Luiginary Attack challenge consists of you plowing through numerous dream copies of her.
- Odd Friendship: Bowser Jr.'s Journey establishes that she is an old friend of Kamek, of all people.
- Verbal Tic: "Hee..."
An elderly Koopa Troopa who lives on Plack Beach, he once held one of the Star Cures before Bowser stole it and all of his furniture after getting frustrated trying to figure out one of his signature jigsaw puzzles.
- Punny Name: Most translations make his name some sort of pun on "puzzle".
An octopoid ascetic meditating on top of a mountain near Plack Beach, he is first introduced as the creator of the Chakroads that Bowser can use to teleport across the Mushroom Kingdom. Later, he is revealed to hold one of the Star Cures, which he agrees to give to Mario and Luigi if they can somehow break him out of the meditative pose he has held constantly for 1,000 years.
- Catchphrase: "You are unenlightened."
- Chekhov's Gunman: Bowser first speaks with him in the first hour of the game. The Mario Bros. first see him near the end of the pre-final dungeon Fetch Quest.
- Enlightenment Superpowers: His meditation allows him to access the Chakroads, and also gives him Super Toughness.
- Meaningful Name: His name, Chakroads, and talk of mediation and enlightenment refer to "chakras", a type of Life Energy.
- Nigh Invulnerable: He quite simply cannot be damaged; he has 999 DEFnote and winning the "battle" just requires using a specific Special Attack.
FawfulSee Superstar Saga antagonists
With Fawful's ascension to primary villain, it's only natural that he'd get a lackey of his very own. This porcine brute may be a rather dim bulb, but his strength rivals even that of the King of Koopas himself. He antagonizes Bowser throughout the game on his master's orders, until he is at last defeated for good in the final stages.
- An Ice Person: His final form, Blizzard Midbus, who blows gales of cold air from his nose and becomes frozen in a block of ice on being defeated. After beating him, Bowser can exploit this by inhaling the frosty air that still comes out of his nose to cool or warm his lungs and alter the nature of the obstacles the Mario brothers have to get over.
- Arrogant Kung-Fu Guy: His manner of speaking and sense of pride and honor nail him as this.
- Balloon Belly: In his second fight, he does this before unleashing a strong punch.
- Big Eater: As much as Bowser. His boss fight has him wolfing down giant cakes and donuts and drumsticks unless Bowser beats him to it.
- The Brute: He's the brawn to Fawful's brains. With the latter being too weak to even carry Peach around without struggling, Midbus provides the raw strength he needs.
- Cloudcuckoolander: "Sense is for the weak."
- The Dragon: To Fawful.
- Dumb Muscle: He makes Bowser look like a genius. Even Bowser finds him an oddball.
- Epic Flail: A wrecking ball.
- Evil Counterpart: Eviler counterpart, perhaps, but he shares numerous characteristics with Bowser.
- Evil Laugh: "Muh muh muh!"
- Foil: Presumably to Bowser. Unlike Bowser, who's king and leader of a Badass Army of minions, Midbus is merely a minion of Fawful. Both are physically imposing Mix-and-Match Critters, but Bowser leans more on the reptile side aesthetically, while Midbus looks more like a warmblooded animal. Finally, Bowser can breathe fire, while Midbus gains ice powers in his final battle.
- Flunky Boss: He can send out Snawfuls once he becomes Blizzard Midbus.
- Full-Boar Action: He's a giant, villainous, slightly reptilian pig-monster.
- Gluttonous Pig: He's a giant pig beast and will happily scarf the food the audience throws to him during his match with Bowser.
- Hopeless Boss Fight: The battle against him in Cavi Cape.
- Intentional Engrish for Funny: Just like his master, though unlike Fawful's near-incoherence, Midbus' dialogue is more stilted than anything, sounding a lot like those badly-translated kung fu movies. Strangely, though, he speaks normally with his new lines in Bowser Jr.'s Journey, and the fact no-one comments when it happens indicates it wasn't intentional.
- King Koopa Copy: He's designed as a Mirror Boss to Bowser, having a similar build and temperament as him, along with the Horns of Villainy. Unlike him, though, he gains cryokinesis in contrast with Bowser's fire breath.
- Meaningful Name: Midbus is a Mid-Boss.
- Mix-and-Match Critters: Like some kind of boar armadillo.
- Noble Demon: Has shades of this. During his fight with Bowser in Cavi Cape, he calls off the match when it appears Bowser is weakened by the Vacuum Shroom. He goes as far as to criticize Bowser for fighting him while giant, and being roasted doesn't change his attitude.
- No Cure for Evil: Aversion; in the cage match, he can heal himself by eating food tossed by audience members, if Bowser doesn't get to it first. His Snawfuls will also heal and power him up if they're left alone in his final battle.
- Obfuscating Stupidity: If his casual coherence in speech during Bowser Jr's Journey is anything to go by.
- One-Winged Angel: Blizzard Midbus.
- Pig Man: A bit more animalistic and reptilian than the trope standard, but he still fits.
- Power Incontinence: After Blizzard Midbus is defeated, he loses control of his powers, and becomes frozen in a block of ice.
- Punny Name: Mid-boss.
- Recurring Boss: For Bowser, being fought three times.
- Shockwave Stomp: Shockwave Body Slam, technically. Bowser can counteract it by punching Midbus away before he lands.
- Spikes of Villainy: Wears a pair of spiked collars and has a pair of bull horns.
- That Makes Me Feel Angry: "He is very round. I am amused."
- The Unfought: For the Mario Bros., who only encounter him once at the very end of the game and end up fighting the Junker robot instead.
- What Happened to the Mouse?: His fate following being frozen in a block of ice is unknown.
The Dark Star
A being of pure evil that terrorized the Mushroom Kingdom in the distant past, but was eventually sealed away. Fawful unearthed it and attempted to drain its power, but the dark entity proved too powerful for him to handle; it consumed him and, after copying Bowser's DNA, transformed into a shadowy double known as Dark Bowser.
- Artifact of Doom: It is a sentient Made of Evil artifact of unknown origin and brings nothing but destruction when free.
- Beam-O-War: Against Bowser shortly before the Final Battle, though it's more like a Flame-O-War.
- Break the Haughty: Bowser kicking its ass does this to him. It is completely stunned that someone like Bowser would be able to stop it with the dark power completed.
- Casting a Shadow: It can animate and control shadows.
- Combat Pragmatist: By the Stars, yes. It's immune to all damage (at first), it turns invisible during one of its attacks, summons backup, attacks while dormant, tries one last attack when its health is depleted... and, after dodging its giant laser with the aid of Starlow, the Dark Star decides to bumrush her, and by extension, you, dealing heavy damage if you fail to let go (noteworthy in that it is the only enemy to do this).
- Dark Is Evil: Right in the name. The Dark Star is a being of darkness with power over shadows, and absolutely evil.
- Diabolus ex Nihilo: Even in-universe, nobody has any idea where this thing came from or what the heck it even is.
- Dual Boss: While the Dark Fawful Bug is still active in the final battle, both Fawful and the Dark Star attack together.
- Eldritch Abomination: No one knows where it came from or what it is other than it's just pure evil. It can turn into a copy of others by entering their body and eating their DNA. And its evil is so oppressive that Mario and Luigi nearly choke to death just by being in its presence.
- Evil Counterpart: Serves as one to Bowser for obvious reasons. He is also one for the Starmen and various other Star entities that appear throughout the whole Super Mario Bros. universe.
- Eviler Than Thou: Bowser and Fawful want to rule the Mushroom Kingdom, but the Dark Star wants to obliterate existence outright.
- Evil Is Not a Toy: Subverted. The Dark Star overpowers Fawful to regain the energy he had absorbed from it, consuming Fawful along with it. However, the two seem to form a mutually beneficial, if not truly symbiotic, relationship, with Fawful powering up Dark Bowser from within during its fight with the real Bowser, and the Dark Star's core lending its energy and assistance to Fawful in his own battle against Mario and Luigi.
- Evil Versus Oblivion: Represents oblivion to Bowser's evil.
- Final Boss: Dark Bowser is this for Bowser, while the Dark Star Core (actually a hybrid made of the Dark Star and Fawful) is this for Mario & Luigi.
- Flunky Boss: In its first battle, it spawns bug-like enemies called Dark Satellmites to aid it.
- For the Evulz: Possibly its only discernable motive for wanting to destroy the Mushroom Kingdom.
- Frickin' Laser Beams: It uses dark laser attacks as both its original form and the core of Dark Bowser and its strongest attack blurs the line between this and Wave Motion Gun.
- Generic Doomsday Villain: A rare dead-serious example. It desires nothing less than the total obliteration of everything in existence.
- It Can Think: The Dark Star decides to copy Bowser's abilities, including his punching, fire-breathing and shell-slamming, by eating his DNA. It's also able to recognize that its power was stolen by Fawful.
- Knight of Cerebus: For most of Bowser's Inside Story, you get plenty of laughs from the eccentricity of Fawful and Midbus, along with Bowser's attempts to communicate with his brainwashed Koopa Troop. Then comes this thing, which is devoid of any humor and plans on destroying everything in its path.
- Leitmotif: Has a pretty ominous tune that plays whenever it appears. It certainly helps cement its Knight of Cerebus status. The 3DS remake gives the Dark Star its own unique battle song for the main fight against it (Dark Star X doesn't get this song).
- Made of Evil: All forms. Apparently, a form of evil which can clone people's DNA.
- Mirror Boss: After absorbing Bowser's DNA, it becomes a dark copy of him.
- No-Sell: When Mario and Luigi pursue it through the Airway, nothing they do can stop it from absorbing Bowser's genetic code and gaining his abilities. In the battle with the Dark Star, it takes 0 damage from Mario and Luigi's attacks and can only be damaged by bashing its own minions back at it.
- Obviously Evil: They don't call it the Dark Star for nothing.
- Omnicidal Maniac: It wants to destroy Mushroom World, if not the entire universe.
- Red Eyes, Take Warning: In most of its forms, one notable exception being the Final Boss, where its eyes are white instead.
- Sealed Evil in a Can: It was sealed under Toad Town by the Star Sprites, but Fawful opened the can.
- Shielded Core Boss: Taken to an extreme in the final battle. First Bowser must deplete Dark Bowser's 1000 HPnote , after which Dark Fawful will fully heal and enlarge him. Then Bowser must punch Dark Fawful out of Dark Bowser's belly and then inhale him. Then Mario & Luigi must destroy Dark Fawful's Cognizant Limbs in order to expose the true weak point, the Dark Star Core.
- Sound of Darkness: Two of them. In the original game, the Dark Star makes a distinctive pulsing noise when it moves. The remake instead has it constantly make a strange rattling noise that gets louder as it moves, with the previous pulsing noise being heard during one of its attacks.
- Spikes of Doom: Its design has eight spikes (likely just energy since it can always be jumped on without harming the Bros.) sticking out from its main body.
- Tactical Suicide Boss:
- The Dark Star would be nearly impossible to defeat if it didn't keep spawning Dark Satellmites to aid it in battle.
- In the final battle, if Dark Bowser didn't grow larger whenever Fawful revives him, Bowser wouldn't be able to target his belly, which causes him to spit out Fawful for Bowser to inhale and the Mario Bros. to defeat.
- Taking You with Me: When Mario & Luigi deplete its HP in the Airway battle, you then have to button mash to escape its kamikaze vacuum attack until it croaks.
- Technicolor Fire: Breathes out blue flames as Dark Bowser.
- Too Spicy for Yog-Sothoth: Subverted. It has visible discomfort while copying Bowser's DNA at first, but it eventually adjusts. Starlow even lampshades it.Starlow: Only Bowser's body could give even the Dark Star indigestion.
- Vile Villain, Saccharine Show: You would think a game as hilarious as this wouldn't have such a monstrous Eldritch Abomination. But the Dark Star...begs to differ.
- The Voiceless: In its base form, it can't speak. It gains the ability to talk upon turning into Dark Bowser.
- Worf Had the Flu: The Dark Star's power had been split between it and Dark Fawful when the Mario Bros. fought it in the Airway.
The Best Fitness Friends/Brute Force Federation
A trio of strange pinkish humanoids that are the main antagonists of the Bowser Jr.'s Journey side game in the Updated Re Release of Bowser's Inside Story. They claim to be personal fitness gurus with a cure for the Blorbs, and while that may or may not be true, they are in league with Fawful and infiltrate Bowser's Castle while it was under Jr.'s watch. They consist of Dieter, a rail thin sunglasses-wearing leader who wields cards, Beef, a big martial artist that looks like he was smushed into a tire-stack like shape and Kaley, a little blue haired girl that looks and flies like a bird.
- Addiction-Powered: Anyone who consumes the drug Malatone:X can get more powerful. The BFF use it on themselves, and their combined form takes it to boost its stats.
- Aw, Look! They Really Do Love Each Other: When Ludwig reveals he disguised himself as Beef, Kaley begins to panic and press Ludwig on where Beef is, going as far as saying that she is "Lost without [her] Beef."
- Beware the Silly Ones: It's no doubt that they are a trio of goofballs, but their teamwork as mercenaries for Fawful is frighteningly efficient, managing to take out the Koopalings one after another, which is best exemplified when they shove Iggy off a cliff with the intent to kill him, and then two of the three dance and sing their theme song.
- Big Bad Duumvirate: The three serve together as the main villains of Bowser Jr's Journey.
- Brown Note: Kaley is able to shriek extremely loudly as her special attack.
- The Brute: Beef is "the brute force of the BFF".
- The Cameo: After Ludwig manages to take out Beef and impersonates him to spy on Dieter and Kaley, he deposits Beef's unconscious body in the Bob-omb depot before Bowser falls in there and unwittingly sets off the explosive charges in the main story.
- Colour-Coded for Your Convenience: Beef, Kaley and Dieter have a red, blue and yellow motif - and sure enough, Beef is a Melee unit (red), Kaley is Flying (blue) and Dieter is Ranged (yellow).
- The Corrupter: They make Morton eat a mix of the Skeletone:D and a frog 10 times more poisonous than a poison mushroom - Malatone:X, that turns him against Jr. They do this to the other Minions, as well as themselves in the final battle.
- The Dark Chick: Kaley is "the professional cutie of the BFF".
- Deadpan Snarker: Dieter, who openly insults more heavyset characters like Midbus and Beef in particular.
- Death Dealer: Dieter uses cards to attack.
- Dub Name Change: They are collectively known as "The SS Company" in the Japanese version, which is initially said to stand for "Super Supplier Company" but is later revealed to actually be short for "Shun Satsunote Company". In the English version, they are the "Best Fitness Friends", or BFF for short, while their true name is "Brute Force Federation". Sulimu was changed to Dieter, Kyutto/Kyut to Kaley, and Muchio to Beef.
- The Evil Genius: Dieter is "the brains of the BFF".
- The Fake Cutie: Kaley is chirpy and upbeat, and her bio describes her as a "professional cutie". She's just as malicious as her comrades, though, and the same bio goes on to question whether her cutesy behavior is how she really is.
- Failed a Spot Check: Despite noticing how Beef is acting differently, neither Dieter nor Kaley ever realise that Ludwig had disguised himself as Beef until he drops the disguise in Dimble Wood.
- Flunky Boss: A given due to the nature of the game they're in, though Dieter takes it Up to 11 and creates doppelgangers of himself. In their combined form, it summons shadow versions of the Koopalings to combat Jr.'s own original team.
- Frickin' Laser Beams: Their combined form's special attack, though it's more of a Wave Motion Gun.
- Fusion Dance: Once beaten after powering themselves up, they fuse into a One-Winged Angel tri-colored monstrosity.
- Getting Crap Past the Radar: Kaley is, while she is as focused on their task, constantly hyper and peppy. She is this way because - as she puts it- there are so many supplements swimming through her system she can't tell if her high morale is her own. It's such a clear equivalent to drug addiction that it's a wonder it got past the radar.
- Hair-Trigger Temper: Kaley's weakness. Ludwig insulting her fitness and revealing the BFF's plan to usurp Fawful has her become incoherent with rage.
- Informed Species: Word of God claims they're of the same species as Midbus, except they look nothing like the armadillo-pig hybrid thing that Midbus seemingly is. In fact, they look nothing like each other, since Dieter is a humanoid, Kaley is some sort of bird and Beef is a monster made of flab.
- Lean and Mean: Dieter is extremely thin, and works for Fawful alongside Kaley and Beef.
- Meaningful Name: Dieter is stick-thin, as if he's been dieting too long. Beef is very... beefy, and Kaley sounds like kale, which is considered a healthy food. Their Japanese names (Sulimu, Muchio and Kyutto) are corruptions of the English words "slim", "macho" and "cute", respectively.
- Power-Up Food: Their creation, Malatone:X. When given during a battle, it fully heals and buffs the consumer's stats - but at the cost of their sanity. Overlaps with Psycho Serum.
- Primary-Color Champion: Subverted. Dieter is yellow, Kaley is blue, and Beef is red, but none of them are heroic.
- Psycho Serum: Malatone:X, which is used to brainwash minions and power them up. They use it on themselves to power up. According to Dieter, "it will only alter 97% of your DNA".
- The Quiet One: Beef is very much the strong, silent type, to the point that Dieter and Kaley are surprised when he does chime in - and it later turns out that wasn't even him at all.
- Sinister Shades: Dieter sports a pair.
- The Starscream: Despite working for Fawful, they want to overthrow him by brainwashing Fawful's minions after finishing off Bowser Jr and the Koopalings.
- Terrible Trio: Of the Big, Thin, Short Trio variety.
- With Great Power Comes Great Insanity: Their Malatone:X has this effect on those that take it. The BFF fall victim to this as well, as their powerful combined form is completely obsessed with fitness and getting stronger, and has no other personality to speak of.
- Worthy Opponent: Ludwig admits that their strategies are good enough to take notes on.
- You Gotta Have Blue Hair: Kaley has blue, Dieter has yellow-ish and Beef has red.
The prince of the Pi'illos, he was Taken for Granite along with the rest of his people in the process of imprisoning Antasma with the Dark Stone. Upon being freed by the Mario Bros., joins up with them in order to rescue the other Pi'illos and defeat Antasma once and for all.
- Arch-Enemy: He has the biggest beef with Antasma of all the hero characters.
- Catchphrase: "Dreamy!" and "INSOLENCE!"
- Ermine Cape Effect: He always wears the same fancy regal outfit wherever he goes.
- Exposition Fairy: Shares this role with Starlow in the real world, takes over completely in the Dream World.
- Face Fault: He does several along with the Mario Bros. The most notable one is when the Zeekeeper turns the remains of the Dream Stone into a bunch of coins; Dreambert plants on the ground so hard out of shock that he has trouble getting back up.
- Healing Hands: He heals Mario at least once per turn during the final battle with Antasma.
- Mad Libs Catchphrase: "Be one with ____".
- No Sympathy: He doesn't sympathize with Antasma when Bowser betrays him; instead, he mocks him for it. Unsurprising, given what Antasma did to him and the rest of his species.
- Pals with Jesus: With the Zeekeeper.
- Royals Who Actually Do Something: Beyond being an Exposition Fairy and letting Luigi sleep on him to open dream portals, he absorbs the power of the dark roots growing in Neo Bowser Castle, directly fights Antasma alone and later assists Mario in finishing off the villain. He also trains Luigi on a lot of dream world moves, stating that he has a lot of experience with using them.
- Support Party Member: An uncontrollable one in the final battle with Antasma, where Dreambert heals Mario every turn.
- Voluntary Shapeshifting: He can change into a pillow so that Luigi can sleep on him and access the Dream World.
- What the Hell, Hero?: Starlow really lets Dreambert have it when he reveals that he has a block that unlocks Warp Pipes hidden in Mt. Pajamaja, especially that he only remembered about it after the Dreambeats crisis is over, when they were supposed to be running away.
The proprietor of Mushrise Park, "Boss" Brickle is a gruff Brock who won't tolerate any slack in his employees.
- A.I. Is a Crapshoot: Occurs with his Grobot when it gets bonked by the remains of the Park's fountain.Brickle: IT'S ON DA FRITZ!
- All for Nothing: Subverted, he enlists the Mario Bros. on the job of clearing the rest of the rubble in Mushrise Park, under the promise of giving them the treasure he found. After the deed is done Brickle keeps his word, except none of them are sure that his treasure is the very same one the heroes are after, the Mushrise Tree Board, causing Starlow to give Brickle an earful. Dreambert, however, clears things up by identifying the treasure as indeed what they were looking for.
- Gadgeteer Genius: He built many of the fountains and other structures in Mushrise Park, and also constructed Grobot to water flowers.
- Jerkass: Did he really need to play a wild goose chase with the bros just to lend them his pillow?
- Jerk with a Heart of Gold: Though he's mostly this. His dreamy counterpart being a "rival" going after the bunny not knowing the Bros were after the nightmare chunk while still helping the bros with attack pieces, training them on how to use Luiginary attacks, and healing them completely at a few points reflects his real world interaction with the bros.
- Laser-Guided Karma: His unnecessary getaway from the brothers causes a whole lot of trouble in his beloved park. First, he gets stuck in the park's main attraction - a fountain - and then is pushed off using high water pressure, which also causes the fountain to skyrocket all the way above the island to break the player's top screen. Then, the fountain falls down on the park's maintenance robot which causes it to have a malfunction and go irate at the administrator's hut. Finally, Brickle tries to calm down his creation and is mercilessly tossed away like a ragdoll. When all it's over, he's crushed. In the end he admits it was his own fault that the Humiliation Conga happened and apologizes to the Bros for all the trouble.
- Long Pants: It's a little hard to tell if those are just high blue work boots or if those are also his pants.
- Pink Girl, Blue Boy: The blue boy to Britta's pink girl.
A female Brock who works tirelessly in Dozing Sands to break rocks with her Shelltop crew. She is just like Brickle, but she's harsher to her employees, threatening to fire them at every chance she gets.
- Distaff Counterpart: She's basically a female Brickle in terms of her personality and even her speech patterns.
- The Dreaded: Her employees are deathly afraid of even accidentally making her angry.
- Greed: She wants the treasure that she believes to be atop the sand flow the Mario Bros. are trying to get up, even ordering them to stay put while she goes forward.
- Jerkass: She's awfully mean to her employees.
- Jerk with a Heart of Gold: Deep down inside she's this. Her problem seems to be her absurdly high standards- her crew can't meet them, but she has respect for Mario and Luigi when they succeed.
- Long Pants: As with Brickle above, only pink.
- Not Quite Dead: During the funny aftermath of being attacked and swallowed by Torkscrew. Her Shelltop workers see her lose consciousness and lament her apparent death as dramatic music plays and the screen starts fading to black, only for her to declare she's not dead.
- Pink Girl, Blue Boy: The pink girl to Brickle's blue boy.
A wise Pi'illo person who has vast knowledge of everything that is Pi'illo related.
- Affectionate Nickname: The Zeekeeper refers to him as "Eldawg", and he in turn calls the Zeekeeper "Zee".
- Collection Sidequest: He hands out rewards for freeing petrified Pi'illos, with the last reward being the Zee Egg.
- Everything's Better With Bunnies: Has a pet fluffy rabbit in the Dream World. Why that bunny was holding him captive in a nightmare chunk, running away from their potential rescuers is strange, but it could be because Dreamy Brickle was chasing the bunny itself.
- Pals with Jesus: Turns out he's a good friend of the Zeekeeper, the island's legendary guardian deity.
- This Is a Drill: Eldream opens a path to Dream's Deep by having his Fluffykins drill through the ground.
- Undying Loyalty: Dreambunny carries around the Nightmare Chunk holding Eldream presumably to protect it from anyone it thinks may do him harm.
Dream Stone Spirit
The spirit inhabiting the Dream Stone artifact that the heroes are trying to retrieve from Bowser and Antasma. It does not like being awoken from sleep.
- Berserk Button: Waking him up from a peaceful sleep can end horribly for you.
- Blow You Away: One of Robo-Drilldigger's attacks involves launching tornadoes.
- Disproportionate Retribution: Don't want to be disturbed from sleep? Just smash the people trying to get your help with a giant robot.
- Humongous Mecha: Robo-Drilldigger is formed by a bunch of gears and drills the Dream Stone's spirit pulls together, and it's the first Giant Luigi boss.
- Jerkass: So you just want some information on where the real world Dream Stone is. Well, he'd be happy to...NOT TELL YOU! You still insist? SHADDUP! SHADDUP! GO TO SHADDUPVILLE! Oh, you've bumped into it with a Luigi stack? GET THE BIG GUNS OUT!
- Light Is Not Good: One would expect the spirit of the Dream Stone to be benevolent. He's not. At all.
- This Is a Drill: Robo-Drilldigger.
- Transforming Mecha: Robo-Drilldigger can change between robot, vehicle and jet forms.
- Warmup Boss: His entire battle as Robo-Drilldigger is pretty easy compared to the later Giant Battles.
- What Happened to the Mouse?: Goes into a more permanent sleep nearing the end of the game, so his reaction to having his stone destroyed is never seen. This also makes you wonder if there's a dark stone spirit and what happened to it.
- Worthy Opponent: He is so impressed by Luigi's fighting prowess that he decides to tell just him where the Dream Stone went. However, he does express a desire to face Mario in a similar battle later down the line.
The Massif Brothers
Two Hooski brothers who serve as the tour guides for Mount Pajamaja and are a little too much into fitness, rock climbing, and BEEF.
- Bunny-Ears Lawyer: They're pretty competent tour guides, teaching the Mario bros multiple field moves. They're also obsessed with everything BEEF!
- Difficulty Spike: Big Massif. The game stops pulling punches the moment he is introduced into the plot.
- Fastball Special:
- One of Big Massif's attacks basically consists of his allies volleyballing him around before striking him towards Mario.
- In a non-combat example, one section of Mt. Pajamaja involves the bros. sending the Massifs flying to destroy some obstacles.
- Fetch Quest: In order to find Big Massif in Dreamy Wakeport, the bros must collect medals from each of his disciples.
- Flunky Boss: Big Massif.
- Hidden Depths: As tour guides of Mount Pajamaja, we see them promoting strength and beefiness above all else, but when the hidden treasure cave is discovered, they feel the need to research said part of the mountain they never knew about beforehand just so that they can provide a greater experience to future tourists. In other words, they also happen to be scientists who specialize in anything that involves said mountain.
- Also, notice that they never experience jealousy over being outperformed, instead they're impressed, deeming the Mega Pi'illos as "muscle lords" for opening the gate that they couldn't budge, and Mario and Luigi as "mountain maniacs" and "prime steak" for having completed tasks that the Massif Bros couldn't and even gives the Bros credit for finding the treasure. It makes sense when you remember they want everyone to be their "beefiest".
- Big Massif's dream and his dreamy disciples shed some light on aspects of his personality as well.
- Husky Russkie: They're Hooskis with clear Russian affectations to their speech, and quite tough.
- Kill One, Others Get Stronger: Big Massif gets rather angry and gains a power boost for each of his Mooks that you kill.
- King Incognito: The Dreamy Wakeport tour guide is revealed to be Big Massif himself once the Hooraws are defeated.
- Large Ham: They even refer to themselves as "huge hams" at one point.
- Missed Him by That Much: The search for Big Massif encompasses all of the Wakeport area, and yet he's actually just in the very same area as Li'l Massif; they're only separated by a roadblock and a gate.
- Mother Russia Makes You Strong: They're the Mushroom World equivalent of a Russian nationality, and they're the buffest, beefiest, toughest of their kind.
- Quirky Miniboss Squad: The Hooraws, Big Massif's disciples, are a non-evil example.
- Rated M for Manly: These guys are chock-full of BEEF.
- Punny Name: "Massif" sounds like "massive".
- Recurring Element: Like with the Hammerhead Bros. and the Jellyfish Sisters in Superstar Saga and the Junior and Elder Shrooboids of Partners in Time, the elder sibling is red and the younger sibling is green.
- Shockwave Stomp: Big Massif's most powerful attack. Also one of the chase attacks, so he will do it repeatedly!
- Sleeves Are for Wimps: Both of them wear sleeveless shirts.
- Testosterone Poisoning: Played for Laughs.
The proprietor of Pi'illo Island in the absence of the Pi'illos themselves, Dr. Snoozemore is a scientist researching sleep.
- Chekhov M.I.A.: He is absent from the game, on a research trip, until Antasma's plan takes place.
- Counting Sheep: He references this trope by being a ram-like creature who cannot stay awake.
- Meaningful Name: He's narcoleptic, so he does indeed snooze more than most of the residents of Pi'illo Island.
- Russian Reversal: "As you may know, I research sleep...clearly sleep also researches me..."
- Senior Sleep Cycle: Implied to be elderly, and falls asleep mid-sentence at frequent rates.
Four seahorse-like creatures, these siblings live in Dreamy Driftwood Shore and help the Mario Bros. in their efforts to hide Peach from Bowser and Antasma by expanding the Dream World with their Dream Eggs. They consist of: Seadric, the eldest; Seabelle, a Valley Girl obsessed with her looks; Seatoon, a young boy obsessed with Saturday morning cartoons; and Seabury, a would-be stand-up comedian.
- Actually Pretty Funny: Luigi laughs at the last of Seabury's puns after a series of Face Faults from him, Mario and Dreambert.
- Chatterbox: This is what Seadric says makes his siblings so annoying, and all of their cutscenes are fairly lengthy.
- Compliment Backfire: While he's on the phone, Seadric calls Dreambert a "fluffy pillow dude." You can see Dreambert visibly fuming in anger behind the guy's back.
- It's All About Me: Seabelle demands enthusiastic compliments from the gang in order for her to give up her Dream Egg.
- Meaningful Name: Seabelle is very concerned with looking beautiful, and Seatoon is a total nerd for his favorite animated show.
- Mr. Seahorse: Being actual seahorses, it's unsurprising that the brothers are just as capable of producing eggs as the sister.
- Pungeon Master: Seabury likes to crack jokes. Most of them result in a Lame Pun Reaction from the Mario Bros.
A Pi'illo who is able to craft special beds.
- Ambiguously Gay: As said by Dreambert, Bedsmith likes to nap on people. But even the prince's reactions make this trope resurface. Doesn't help with Bedsmith swooning at every magnificent event and declaring that he needs to nap on the bros.
- Bunny-Ears Lawyer: He's the best there is when it comes to crafting beds, though his...weird behavior could lead you to believe otherwise.
- His Name Really Is "Barkeep": He's a bedsmith...and his name is Bedsmith because he's so good at it.
- My Brain Is Big: A master craftsman, and the only Pi'illo with his pillowcase head oriented vertically, implying this to some degree.
- Opaque Lenses: Seem to add to his eccentric artiste persona.
- Perfectly Cromulent Word: Frequently describes Prince Dreambert as "Nappable" (as in, someone he'd like to take a nap on).
- Punctuated! For! Emphasis!: All the time. "BEDSMITH! IS! THRILLSMITH!"
- Third-Person Person: Bedsmith refers to himself in third person.
A sacred rainbow-colored bird who is known as the protector of Pi'illo Island. It hasn't been seen in ages.
- Affectionate Nickname: Eldream refers to him as "Zee", and he in turn calls Eldream "Eldawg".
- Classical Tongue: The Zeekeeper has this style of diction, until you beat him. He slips back into this a few times here and there.
- "Get Back Here!" Boss: For the Giant Battle against him, he keeps flying away and Giant Luigi has to chase him. The latter can only damage the Zeekeeper through counterattacks most of the time.
- The Gods Must Be Lazy: The Zeekeeper beat the tar out of Antasma centuries ago, but nowadays he'd much rather just nap. Unless he's bribed with absurd amounts of money.
- Hypocritical Humor: In the ending, he lectures everyone on the dangers of depending too much on material goods...and immediately flies off while squawking about how much he loves money.
- Jive Turkey: Rather comically for an ancient magical being, he speaks in humorously exaggerated street slang; he especially likes to people "dawg". Bonus points for actually being a bird."DREAMBERT, MY MAN!"
- Kansai Regional Accent: His true manner of speech in the original version. Translated as Totally Radical.
- Money Fetish: He loves coins.
- Pals with Jesus:
- Dreambert is a "dawg" friend of his.
- Eldream is also one. Or rather, "ELDAWG!"
- Physical God: He's barely fazed after getting the tar beaten out of him by Giant Luigi, and goes on to blast Bowser's castle out of the sky in a single move.
- Retired Badass: He considers himself to be this, which is why he has to be bribed to save the world at all.
- Summon Magic: Mario's final Bros. attack summons him to aid the heroes in a tandem attack.
- Tennis Boss: One of his attacks is to lay eggs to attack you with. Giant Luigi can hammer them back at the Zeekeeper for extra damage.
- Third Eye: Where his WakeBeam is fired from.
- Totally Radical: What he talks like for REAL, dawg.
- Walking Spoiler: The fact that he appears in person isn't much of a spoiler in itself, but his true personality is.
- Your Size May Vary: While it's common for RPG characters to appear at different sizes between the overworld and battles, the Zeekeeper deserves special attention as the Mario Bros. engage him in a Giant Battle even though he's not that big in the overworld. Of course, being a Physical God, he may have made himself bigger.
A living nightmare creature from the Dream World. During her visit to Pi'illo Island, Princess Peach is kidnapped by Antasma when Luigi opens a portal to the Dream World, causing the Mario Bros. to set out and rescue her. When Bowser appears, he proposes a partnership with the Koopa King to further his goals. This proves to be a mistake, since Bowser ends up stabbing him in the back at the end.
- Advancing Boss of Doom: During the final battle, one of his attacks is to chase Mario while tossing explosive spheres at him. And if one of his attacks puts Mario to sleep, he can enter his dreams and chase him while spitting fireballs at him.
- Arch-Enemy: To Prince Dreambert.
- Bat Out of Hell: He can turn into a small bat, or a swarm of small bats. He is also referred to as the Bat King, and used to be a normal bat before feeding on the nightmare of a Pi'illo.
- Big Bad Duumvirate: He forms one with Bowser, once he decides that Bowser's power is far more useful to him than Peach's. It backfires horribly for him later.
- Big Bad Wannabe: Antasma holds the dubious honor of being the first major Mario RPG villain to end up overshadowed by Bowser as a threat. To his credit, it isn't due to a lack of competence, but due to Bowser himself getting over his own case of such.
- Boss Remix: The music that plays during the first and final battles with him is a remix of his Leitmotif.
- Breath Weapon: Spits out fireballs during the final battle with him.
- Casting a Shadow: Has powerful dark magic.
- Classic Villain: Representing Ambition and Pride.
- Composite Character: He's basically a combination of all the previous Mario and Luigi antagonists (Cackletta, Dark Fawful, the Shroobs, and the Dark Star).
- Curb-Stomp Battle: The fight between him and Dreambert near the end starts out dead even, until he takes the fight to the Dream World where his power is at maximum. Dreambert is sent tumbling out of the Dream World in a heap just a few seconds later.
- Deal with the Devil: Makes one with Bowser, promising him that he would have Peach all for himself once they took over the world. He finds out all too late that he wasn't the devil in the deal.
- Demonic Possession: He's capable of possessing others.
- Don't You Dare Pity Me!: Says this to Dreambert after the latter mocks him for Bowser's betrayal.
- Dream Walker: Especially once he reveals that he now has the ability to create portals to the Dream World at will.
- Dream Within a Dream: If Mario is hit Antasma's bat attack in the final battle with him, he'll fall asleep and Antasma will enter his dreams and chase him. The X version can induce this on ALL of his attacks.
- Dropped a Bridge on Him: Well yes, you do get to fight and beat Antasma fair and square, but the issue is in the death itself. No villainous rant or Final Boss shenanigans like the unique villains in the last three games, he just...swells up and ultimately explodes like any other regular boss after defeat.
- Emotion Eater: His backstory states that he was a bat who fed off the nightmare of a Pi'illo. This was how he became the nightmare creature he is now.
- Evil Counterpart: Serves as one to Dreamy Luigi. The parallels between them are reflected perfectly in the fight with Bowser. Both characters are capable of manipulating the Dream World to their advantage. Both are capable of enhancing their allies abilities. And both can split into smaller clones of themselves.
- Eviler Than Thou: Inverted. He finds out the hard way that Bowser was this to him.
- Final Boss: Subverted; Antasma is the second-to-last boss in the game (and one of the toughest, especially in the Battle Ring), though he counts as this for the Dream World since he's the last boss fought there. The real final boss is Dreamy Bowser, which is fought in the real world.
- From Nobody to Nightmare: Almost literally, as Antasma was originally a bat who became what he is after feeding on the nightmare of a Pi'illo. And then Bowser singlehandedly throws him back to nobody status.
- Fusion Dance: Much like Dreamy Luigi, he can fuse together with others to make them more powerful. He does this in the first fight with Bowser.
- The Heavy: Played with. He drives most of the plot along at the beginning, but after Neo Bowser Castle is summoned, most of the direct conflict comes from Bowser's Koopa Troop. Though he is talked about, Antasma only enters the stage again in the final parts of the game, along with Bowser.
- Humiliation Conga: Betrayed by Bowser, mocked by Dreambert, and beaten by Mario all in the spam of a minute.
- I Am A Humanitarian: During the final battle, he can trap Dreamy Luigi in one of his Antasmunchies, and if he happens to eat the one containing Dreamy Luigi, he'll become even more powerful than normal (And gain a green aura not unlike the one Mario gets when merged with Dreamy Luigi). Eventually he'll spit Dreamy Luigi back out, though.
- Interface Screw: He can flip the screen over during one of his attacks.
- Lean and Mean: When he fights, he turns into a taller and slender version of his true form.
- Leitmotif: "Antasma's Theme."
- Make Me Wanna Shout: He can fire supersonic waves as a bat.
- Me's a Crowd: He can create duplicates of himself during the final battle, as well as split into swarms of bats in all battles with him.
- Meaningful Name: His name comes from "phantasma", which is Latin for phantom or apparition.
- My Name Is ???: During the first battle with him, he is referred to as "????".
- Obviously Evil: From the moment he first appears, it's obvious that he's the bad guy. Lampshaded by Bowser.
- Off Screen Moment Of Awesome: His final showdown with Dreambert. The latter chases Antasma into a dream portal, then, shortly afterwards Dreambert leaps back out, battered and beaten.
- Our Vampires Are Different: Antasma is awfully similar to a Classical Movie Vampire without actually being a vampire. This includes the wardrobe, the fangs, the Vampire Vords, and the bat association. Certain translations base his name on "Count" and/or "Dracula," and his battle music even sounds like something that wouldn't be too out of place in a Castlevania game.
- "Pop!" Goes the Human: How he dies. He inflates like a balloon and explodes.
- Powered by a Forsaken Child: Harvests dream energy from all living beings on Pi'illo Island (put to sleep by his Dreambeats) to power up the Dream Stone. Oddly enough, the victims don't suffer any ill after-effects.
- Power Floats: Justified in that he doesn't seem to have legs.
- Pragmatic Villainy: It was pretty obvious that he just teamed up with Bowser for convenience. Unfortunately for him, Bowser also anticipated this and planned to double-cross him.
- Recurring Boss: You fight him three times.
- Red Baron: The Bat King.
- Red Herring: Antasma is a Composite Character of all the previous Mario & Luigi antagonists, so you'd think he'd be the Big Bad of the game right? Wrong! He's upstaged by the Bros.' long-time Arch-Enemy and no-longer Butt-Monkey, Bowser.
- Red Oni, Blue Oni: The blue to Bowser's red. Even reflected in their colors.
- Royals Who Actually Do Something: Is referred to as the Bat King, although whether this is an actual title or merely self-appointed is never explained.
- Sealed Evil in a Can: Was imprisoned in the Dream World prior to the game.
- Shell Game: Two of his attacks in his final battle:
- If Mario is pulled into Antasma's Dream Within a Dream attack, the only way to escape is to find the shining portal among several others (of which are traps). The best way to find the right portal is to jump directly above each one, which causes the portal to change color without the need to fall in.
- When pulling a Doppleganger Spin, only one Antasma is seen charging up an attack. The Antasmas shuffle themselves together before lining up to fire at Mario.
- Slasher Smile: His default expression.
- Smoke Out: Is first seen as a cloud of smoke.
- Smug Snake: He's a dangerous threat, but his overconfidence is what ultimately leads to his downfall as he was caught completely off guard by Bowser's betrayal.
- Sorcerous Overlord: What he became after feeding off the nightmare of a Pil'llo.
- Sphere of Power: An odd variation of the trope. During the final battle with him, he surrounds himself with black orbs called Antasmunchies that he can eat to power up his attacks. They can also be used as explosives and can come to life to protect him.
- Super Strength: Despite being a bat, he capable of airlifting Bowser around with ease.
- Taking You with Me: Before he was imprisoned in the Dream World, he shattered the Dark Stone and its fragments turned the Pi'illos to stone.
- Thinking Up Portals: During his fight with Dreambert, he reveals that he used the Dream Stone to give him the power to open portals to the Dream World at will to prevent future imprisonment.
- Unwitting Pawn: He ends up being one to Bowser.
- Vampire Vords: Speaks with a heavy Slavic accent.
- Verbal Tic: His tendency to screech like a bat while talking, which is mocked constantly by Bowser.
- Villainous Breakdown: Bowser's betrayal makes him go from confident to screeching mad as he vows revenge on the Koopa King. He then attacks Dreambert in retaliation.
- Voluntary Shapeshifting: He can transform into a bat, a cloud of smoke, a pillow, his true form, and a larger version of his true form.
- Walking Spoiler: While Antasma himself isn't a spoiler, the fact that he isn't the final boss is.
- Warm-Up Boss: Is first fought at the beginning of the game.
- The Worf Effect: Antasma was all set to kick ass and take names...but then Bowser double-crossed him. To put this into perspective, he went From Nobody to Nightmare then back to nobody. Ouch.