3 Musty Fears—an undead trio of a Dry Bones, Big Boo, and Greaper who ask Mario to participate in a "Find the Flag" game, in Super Mario RPG: Legend of the Seven Stars.
A
Arfur-A suspicious looking character, although he seems to live by a stern moral code.
Axem Rangers—a group of bosses Mario's party faces after completing the Barrel Volcano in Super Mario RPG: Legend of the Seven Stars; a possible parody of the Power Rangers, the Axem Rangers are Red, Black, Pink, Green, and Yellow, with a giant robot head that cumulates the power of the five.
B
BamBoo-A Boo that can be found in the parlor of Luigi's mansion.
Beanstar—this celestial body of lore is known for protecting the Beanbean Kingdom, as well as fueling the chaos brought on by the witch, Cackletta; appears in Mario & Luigi: Superstar Saga.
Blue Goomba—a palette swap of a regular Goomba that pesters Mario in Paper Mario along with his brother Red Goomba.
Blue Yoshi-a dinosaur/dragon that has the ability to fly. Mario has the ability to ride after feeding it a predetermined number of enemies in the game Super Mario World.
Bootha-A Boo found in the Anteroom of Luigi's mansion.
Bootique-A Boo found in the Artist's room of Luigi's mansion.
Bootler—Lady Bow's loyal and admiring Boo butler. He is first seen in Paper Mario, but he makes a cameo appearance in Paper Mario: The Thousand-Year Door, along with Lady Bow after Mario and co. defeat the Shadow Queen.
Border Bros.—these two guard the border of the Mushroom Kingdoom and Beanbean Kingdom with several "border hopping" games, in Mario & Luigi: Superstar Saga.
Bowser—the main villain and usual final boss of the series; debuted in Super Mario Bros. and has appeared in most of Mario's games since (with a few notable exceptions, such as Super Mario Bros. 2). Also known as King Koopa.
Cannon Mole-A Monty Mole that sits in a cannon with Bullet Bills and Bob-ombs inside, who is found in Super Mario Sunshine. The Bob-ombs can be thrown back at him when stunned by water.
Chan-A Buzzy Beetle the can be found in a dojo in Paper Mario. The weakest of the three fighters in the dojo.
Chancellor-Prime Minister of the Mushroom Kingdom.
Chet Rippo-a strange bird-like character who raises one of Mario's stats, but lowers the others, in Paper Mario.
Chief Chilly—a giant Chill Bully, with an icy moustache, that held Wario captive in Super Mario 64 DS; also appears in Mario Kart DS.
Chill Bully—an ice version of Big Bully that appears as a boss in Super Mario 64.
Chubby-A mole who lives in the Moo Moo Farm.
Chuck Quizmo—an inquisitive game show host worm that appears in Paper Mario.
Chuckleroot—a large, gnarled tree, guarding the Chuckola Cola brewery in Chucklehuck Woods, in Mario & Luigi: Superstar Saga.
Chuckolator-a living blob of Chuckola Cola with a wooden shield and blobs in the shapes of a sword and a scope, who is the boss of Chucklehuck Woods in Mario & Luigi: Superstar Saga.
Cortez—the dead spirit of a pirate who resides on Keelhaul Key with his vast amounts of treasure. Holder of the fifth Crystal Star in Paper Mario: The Thousand-Year Door.
Doopliss—a Duplighost boss that steals Mario's identity and appears in Paper Mario: The Thousand-Year Door. He joined forces with the Shadow Sirens after Vivian joined Mario's team. Until you figure out his name, he appears as "?????"
Eldstar-One of the seven stars found in Paper Mario. Teaches Mario the ability to use the Focus technique, and the ability to use the Refresh technique.
Electro Blooper—an electrically-charged Blooper found in Toad Town Tunnels in Paper Mario.
Foreman Spike - A construction worker who served as Mario's rival in the original Wrecking Crew. He reappears working for Bowser in Wrecking Crew '98. He is considered to be a precursor to Wario. In Japan, he is known as Blackey.
Goopy Piranha Plant-A Piranha Plant-like creature that comes out of mud, paint or oil. Can only be defeated by spraying in his mouth while it is opened.
Gourmet Guy-an extremely overweight Shy Guy that sports a bib and a spoon and fork in Paper Mario.
Hamma Jamma-A Hammer Brother, and a competitor in the Glitz Pit. Loves his hammer, and his grandfather is one of the Hammer Brothers from Super Mario Bros.
Hawkmouth—a bird head that comes alive after picking up a crystal inside Wart's castle and attacks the character in Super Mario Bros. 2.
Hayzee-Luigi's Dayzee ally who is also an actor/director.
Heff T.-A gourmet Toad, who enjoys food.
Henry and Orville - Twin brother portrait ghosts. They will want to play hide and seek, and when they are found, will battle Luigi in a toy car and a toy airplane respectively.
Herb T.- A middle-aged bar owner in Rogueport Sewers.
Hoot—a sleepy owl that carries Mario to higher areas. (This character does not have a known official name, but is often referred to as Hoot). Appears in Super Mario 64 and Mario Party Advance.
Huff N. Puff-A cloud overlord. He can be broken up into Tuff Puffs, which he can eat and regain HP if not defeated.
Il Piantissimo—a Pianta imposter that challenges Mario to races in Super Mario Sunshine. If you view his character model without his helmet, he looks like the Running Man from The Legend of Zelda: Ocarina of Time. This is a tiny easter egg that Nintendo added in, probably known only by the development team.
Iron Adonis Twins-Twin Iron Clefts, who are competitors in the Glitz Pit. Their bodies are so tough that they have the highest defense of any creature. The older brother wears red shoes, while the younger brother wears green shoes (similar to Mario and Luigi).
Jr. Troopa—a baby Koopa stuck in his eggshell who would appear six times and fight Mario and his teammates in Paper Mario. He eventually got a horn and some bat wings. He makes a cameo appearance in Paper Mario: The Thousand-Year Door.
Junior Shrooboid—a giant green Shroob that follows E. Gadd's time machine into the present in Mario & Luigi: Partners in Time.
K
Kalmar-One of the Star Spirits who teach Mario how to use the Up & Away star power.
Koopa Bros.—A group of Koopa Troopas that work for Bowser. Their names, according to the colors of their shells and ninja gear, are Red, Black, Yellow and Green. They guard the first Star Spirit, Eldstar, in Paper Mario.
Koopa Kids (or Koopalings) —eight unique children of Bowser that appear in Super Mario Bros. 3, Super Mario World, and Mario and Luigi: Superstar Saga, with the exception of Bowser Jr., who appears in Super Mario Sunshine. Their names are Larry/Cheatsy Koopa, Morton Jr./Big Mouth Koopa, Wendy O./Kootie Pie Koopa, Lemmy/Hip Koopa, Roy/Bully Koopa, Ludwig/Kooky Von Koopa, Iggy/Hop Koopa and Bowser Jr.
Koopa Koot-An old Koopa Troopa that lives in Koopa Village. Asks Mario to do a multitude of favors for him.
Kooper—a Koopa Troopa from Koopa Village. Allied with Mario in Paper Mario.
KP Pete (nicknamed King K)—A friendly minor-league fighter from Glitzville in Paper Mario: The Thousand-Year Door. Goes by the nickname King K in the Glitz Pit.
Kroop-The mayor of Petalburg, and somewhat senile.
Kung Boo-A Boo found in the mirror room of Luigi's mansion.
Lady Bow—a Boo princess that allies with Mario in Paper Mario. She and Bootler take a vacation in Poshley Heights after Mario and his teammates defeat the Shadow Queen in Paper Mario: The Thousand-Year Door.
Lava Bud—miniature Piranha Plants that stem from Lava Piranha in Paper Mario.
Lava Piranha—A huge piranha that lies within the confines of Mount Lavalava and guards Misstar, the fifth Star Spirit in Paper Mario. Has Lava Buds on it as well.
Lee-A member of the Toad Town dojo in Paper Mario. The second strongest member.
Madame Clairvoya-A fortune-telling portrait ghost. She helps Luigi by giving him clues to the next part of the game, and when she is finished, she allows herself to be captured by Luigi.
Mamar-One of the seven Star Spirits, who teaches Mario the Lullaby star power.
Manager-One of the employees at Smithy's Factory.
Marching Milde-A large Milde who breaks into smaller Mildes when she is stomped on by Yoshi.
Marilyn—Beldam and Vivian's sister and the toughest of the Shadow Sirens, judging by her size, in Paper Mario: The Thousand-Year Door. Her catchprase is "Guh", which is the only word she says all the time, except when the Shadow Sirens were about to introduce themselves to Mario.
Merlow-A young relative of Merluvlee. He is about Goombario's age, and gives Mario badges in exchange for Star Pieces.
Merluvlee-A fortune-teller relative of Merlon. She uses her fortune-telling skills to help Mario and company along their quest.
Minh T.-A gardening Toad in Toad Town. Plants the four Bub-ulb seeds to create the door to Flower Fields.
MIPS—the armless yellow rabbit that appears in the basement of Peach's Castle in Super Mario 64.
Miss Petunia-An overweight portrait ghost who is bathing when you find her.
Misstar-One of the seven Star Spirits, who will teach Mario the Smooch star power.
Mr. Luggs-A gluttonous portrait ghost, who will not battle Luigi until Luigi sucks up the food that he is eating.
Mr. Hoggle-The proprietor of the Hot Dog Stand in Glitzville. Wanted to make a new hot dog from a Yoshi egg.
Mite Mole-One of the siblings lost in the mines.
Mom Piranha- A giant Piranha Plant that will hatch out of an egg and fight along side two regular piranha plants in the BeanBean Airport in Mario and Luigi: Superstar Saga.
Monstar-A sparkling ghost-like creature that is actually composed of small star spirits.
Mousimillian-A Squeek who sniffs out a good opportunity to steal loot from people.
Mover-A Puni who will move Mario to a certain floor for a certain amount of coins.
Ms. Mowz—a badge hunting Squeek who joins Mario on his quest in Paper Mario: The Thousand-Year Door after Mario gets a badge found in Hooktail's suite.
Mushroom Boy-Owns a store in Seaside Town, which if you give him a special Mushroom, he'll give you a reward.
Mushroom Retainer-One of seven Toads who were kidnapped by Bowser.
Muskular-One of the seven Star Spirits, who will teach Mario the Chill Out star power.
N
Nana-An old lady portrait ghost who enjoys knitting. Will only attack Luigi if he messes with her yarn balls.
Naval Piranha-An underwater Piranha Plant.
Neville-A father portrait ghost who enjoys reading books in his rocking chair by the fire place.
Niff T.-A Toad who runs the Petalburg shop. Shares a resemblance to the Toad brothers in Rogueport Town.
O
Oaklie—a tree-like denizen of the Forever Forest that appears in Paper Mario.
Petuni-Punio's little sister who is kidnapped by Lord Crump.
Petunia-A talkative flower that loves seeds.
Pierre-One of Ishnail's men.
Phanta Manta—a giant, paper-thin manta silhouette that spreads goop all over Sirena Beach and causes Hotel Delfino to sink into the earth in Super Mario Sunshine.
Pine T., Jr.-A Toad whose father is lost in the Pit of 100 Trials.
Pine T., Sr.-The father of Pine T., Jr. who tried to clear the Pit of 100 Trials.
Pink Yoshi-A pink Yoshi.
Plent T.-One of the Toad brothers that owns the Toad Bros. Bazaar.
Porter-The station manager in Rogueport. He enjoys trains a great deal.
Posie-A kind and generous lily, but can become angry very quickly.
Prince Froggy-A prince that gets turned big by Kamek, who then eats Yoshi and Baby Mario.
Prince Peasely-the Prince of the Beanbean Kingdom, as seen in Mario & Luigi: Superstar Saga. He is a very vain person, but also brave. His mother is Queen Bean. He is green. Was turned into Dragohoho near the beginning of the game.
Princess Daisy—Mario's love interest in Super Mario Land, but now rumored to be the main love interest of Luigi. She is friends with Princess Peach and has appeared in many sports and Mario Party games. She is the ruler of the desert kingdom, Sarasaland.
Princess Peach (or Princess Toadstool) —Mario's main love interest, debuting in Super Mario Bros. and appearing in most of Mario's games since. She is the ruler of the Mushroom Kingdom.
Smorg—small, black creatures that band together to create a large monster. They kidnap all the passengers of the Excess Express in Paper Mario: The Thousand-Year Door.
Spooky-A portrait ghost dog. Will bark at you, and cause Mr. Bones to emerge from the ground and throw bones at you. Spooky will go for one of his bones after Mr. Bones is sucked up.
Starshade Brothers-A pair of Toads who are a general and a sergeant. They teach Mario and Luigi the Spin Jump and High Jump.
Stewart-A Cheep-Cheep who works as a blimp conductor.
Sue Pea-A little girl portrait ghost. She is optional, and you can only fight her by wetting her bed with the water emblem.
Tubba Blubba—a huge clubba in Paper Mario that guards Skolar, the third star spirit (which escaped) and became invincible after his heart was removed from his body.
Tubba's Heart-Tubba's heart, which appears to be a separate being from Tubba.
Tutankoopa—a koopa troopa that lives in the Dry, Dry Ruins and guards the second Star Spirit, Mamar in Paper Mario; also appeared in Mario Pinball Land.
Twila—a moon-like character that appears as one of the hostesses in Mario Party 6.
Twink-A Star Kid that helps Princess Peach and Mario.
Turboo-A Boo found in the nursery of Luigi's mansion.
U
Ukkiki—a monkey that likes to steal Mario's hat, who appears in Super Mario 64 and the Mario Party series; it also appeared in Super Mario World 2: Yoshi's Island under the name of Grinder. Ukkiki refers to the Japanese word for the sound that monkeys make.
