When turmoil erupts in the Marioverse, Mario, Luigi, and other heroes arrive to solve the world's problems. Here is a list of heroes and their allies who fight against the forces of darkness.
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A
B
- Baby Luigi – Super Mario World 2: Yoshi's Island
- Baby Mario – Super Mario World 2: Yoshi's Island
- Baby Peach – Mario & Luigi: Partners in Time
- Baby Wario – Yoshi's Island DS
- Barney Bubble – Super Mario World 2: Yoshi's Island
- Beanbean Advisor – Mario & Luigi: Superstar Saga
- Blablanadon – Mario & Luigi: Superstar Saga
- Blooey – Paper Mario: The Thousand-Year Door
- Bob-omb Buddy – Super Mario 64
- Bobbery – Paper Mario: The Thousand-Year Door
- Bombette – Paper Mario
- Bootler – Paper Mario
- Bow – Paper Mario
- Brighton – Mario Party 6
- Bub-ulb – Paper Mario
C
D
E
F
- Fire God – Mario & Luigi: Superstar Saga
- FLUDD – Super Mario Sunshine
- Flavio – Paper Mario: The Thousand-Year Door
- Flurrie – Paper Mario: The Thousand-Year Door
- Francesca Pianta – Paper Mario: The Thousand-Year Door
- Frankie – Paper Mario: The Thousand-Year Door
- Frog – Super Mario RPG: Legend of the Seven Stars
- Frogfucius – Super Mario RPG: Legend of the Seven Stars
G
- Garro – Super Mario RPG: Legend of the Seven Stars
- General White – Paper Mario: The Thousand-Year Door
- Geno – Super Mario RPG: Legend of the Seven Stars
- Gooma – Paper Mario
- Goomama – Paper Mario
- Goombario – Paper Mario
- Goombella – Paper Mario: The Thousand-Year Door
- Goompa – Paper Mario
- Goompapa – Paper Mario
- Goomther – Paper Mario: The Thousand-Year Door
H
I
J
K
- Kalmar – Paper Mario
- King Bowser – Super Mario Bros. (Bowser joins Mario in Super Mario RPG to defeat the evil Smithy, and in Super Paper Mario he once again teams up with him to defeat Count Bleck)
- King K – Paper Mario: The Thousand-Year Door
- King Nimbus – Super Mario RPG: Legend of the Seven Stars
- Klevar – Paper Mario
- Kolorado – Paper Mario
- Kooper – Paper Mario
- Koopley – Paper Mario: The Thousand-Year Door
- Koops – Paper Mario: The Thousand-Year Door
- Kroop – Paper Mario: The Thousand-Year Door
- Kylie Koopa – Mario & Luigi: Partners In Time
L
M
- Madam Merlar – Paper Mario
- Mallow – Super Mario RPG: Legend of the Seven Stars
- Mamar – Paper Mario
- Mario – Donkey Kong
- Mayor Dour – Paper Mario: The Thousand-Year Door
- Mayor Penguin – Paper Mario
- Merle – Paper Mario
- Merlee – Paper Mario
- Merlon – Paper Mario
- Merlow – Paper Mario
- Merluvlee – Paper Mario
- Metal Mario – Super Mario 64
- Minh T. – Paper Mario
- Misstar – Paper Mario
- Miss Warp – Yoshi's Story
- Moustafa – Paper Mario
- Ms. Mowz – Paper Mario: The Thousand-Year Door
- Muddy Buddy – Super Mario World 2: Yoshi's Island
- Muskular – Paper Mario
- Mushroom Retainer – Super Mario Bros.
N
O
P
- Pa-Patch – Paper Mario: The Thousand-Year Door
- Parakarry – Paper Mario
- Perry – Super Princess Peach
- Pauline – Donkey Kong
- Pennington – Paper Mario: The Thousand-Year Door
- Petuni – Paper Mario: The Thousand-Year Door
- Petunia – Paper Mario
- Pianta – Super Mario Sunshine
- Pixls – Super Paper Mario
- Podley – Paper Mario: The Thousand-Year Door
- Poochy – Super Mario World 2: Yoshi's Island
- Posie – Paper Mario
- Prince Peasley – Mario & Luigi: Superstar Saga
- Prince Pine – Yoshi's Safari
- Princess Daisy – Super Mario Land
- Princess Éclair – Paper Mario: The Thousand-Year Door
- Princess Peach – Super Mario Bros.
- Professor Elvin Gadd – Luigi's Mansion
- Professor Frankly – Paper Mario: The Thousand-Year Door
- Pungent – Paper Mario: The Thousand-Year Door
- Puni Elder – Paper Mario: The Thousand-Year Door
- Punio – Paper Mario: The Thousand-Year Door
- Puniper – Paper Mario: The Thousand-Year Door
Q
R
S
- Screamy – Paper Mario: The Thousand-Year Door
- Sergeant Flutter – Super Mario RPG: Legend of the Seven Stars
- Skolar – Paper Mario
- Space Rabbit – Super Mario Galaxy
- Spriteling – Wario World
- Star Spirits – Paper Mario
- Starshade Bros. – Mario & Luigi: Superstar Saga
- Stuffwell – Mario & Luigi: Partners in Time
- Subcon – Super Mario Bros. 2
- Sushie – Paper Mario
T
- Tayce T. – Paper Mario
- TEC-XX – Paper Mario: The Thousand-Year Door
- The Stork – Super Mario World 2: Yoshi's Island
- Thunder God – Mario & Luigi: Superstar Saga
- Toad – Super Mario Bros.
- Toad (species) – Super Mario Bros.
- Toadbert – Mario & Luigi: Partners in Time
- Toadette – Mario Kart: Double Dash!!
- Toadiko – Mario & Luigi: Partners in Time
- Toadsworth – Super Mario Sunshine
- Torque – Paper Mario: The Thousand-Year Door
- Tumble – Mario Party 3
- Twila – Mario Party 6
- Twilight Towner – Paper Mario: The Thousand-Year Door
- Twink – Paper Mario