Main characters: The Mario Brothers | Allies (The Princesses) | The Koopa Kingdom (Bowser — Bowser Jr. — The Koopalings — Other High-Ranking Subordinates — Bosses) | Assorted Nasties
RPG characters: Super Mario RPG | Paper Mario (64 — The Thousand-Year Door — Super — Sticker Star — Color Splash — The Origami King) | Mario & Luigi (Minion Quest: The Search for Bowser)
Spinoff series: Yoshi's Island | Luigi's Mansion | Mario Golf | Mario Tennis | Super Mario Maker | Donkey Kong series (Kongs) | Wario series (Wario and Waluigi)
Crossovers: Punch-Out!! | Super Smash Bros. | Mario and Sonic at the Olympic Games | Skylanders | Mario + Rabbids Kingdom Battle
Other media: Super Mario Bros. (1993) | The Super Mario Bros. Movie
Characters in Super Mario Maker. For information on Mario, Luigi, the Toads, Toadette, and Peach, see here and here.
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Teachers and Assistants
Yamamura

- Berserk Button: Never misspell his name.
- Brought to You by the Letter "S": He wears Mario's red "M" on his crest.
- Insistent Terminology: What makers create are courses, not levels.
- Talking Animal: Yamamura speaks in "coo"s, which are translated in paranthesis.
- Trademark Favorite Food: Edamame beans in Japanese and American English, though the British version changes it to fried chicken. In 2, it's revealed that he likes both equally.
Mary O.

- Chuck Cunningham Syndrome: She doesn't show up in 2, where Nina fills her role in the tutorials.
- Dub Name Change: Originally named Mashiko in Japanese (which is also her name in the British release), and is named Yeja in Korean.
- Office Lady: Has the proper bun and work attire of one, though the most we see of her office is in the course "Mary O.'s Lunch Break."
- Punny Name: Her American name sounds like a "Marry-o" in many American accentsnote , which is how some English-speakers pronounce the name "Mario"note .
- Token Human: Serves as this for the main game.
Nina

- Angrish: When she falls into a bottomless pit from hitting an invisible block, she lets Yamamura know exactly what she thinks of his cheap tricks.Nina: RAAAAAAAAAAAAAAAGHGHABRHGAAH!
- Attention Deficit... Ooh, Shiny!: She is easily distracted by coins, and on one occasion goes into a coin-collecting trance when presented with enough of them.
- Expressive Hair: The little strands of hair poking up atop her head will sometimes change shape to accentuate her mood, such as forming a question mark shape when she's pondering something.
- Idiot Hair: She has two strands of hair sticking up from the center of her head.
- Literal-Minded: Yamamura asks what purpose a random Goomba serves in her level. Nina tries to give it a backstory before Yamamura specifies what he means.
- Suspiciously Similar Substitute: Nina has the same role as Mary O., being Yamamura's apprentice.
Helpers
Characters that represent functions of the game's Course Builder mode.In General
- Ascended Extra: While all of them were present in the first game, Super Mario Maker 2 greatly increases their roles in its story mode.
Undodog

- Karma Houdini: Never gets reprimanded for his actions. Nor does anyone even try to prevent him from hitting the button for the reset rocket.
- Nice Job Breaking It, Hero: He's responsible for Peach's castle obliterating in SMM2's story mode.
- Punny Name: His name is a pun on "undo" and "underdog."
- Transplant: He's a holdover from Mario Paint, and he keeps his original function from that game.
Mr. Eraser

- Animate Inanimate Object: He's a walking, talking eraser.
- Expy: Serves as this for the "E" eraser in Mario Paint.
- Meaningful Name: While the obvious function is there, his gangster qualities in SMM2 gives his "erasing" capabilities a more sinister meaning.
- Neighbourhood-Friendly Gangsters: His missions in SMM2 involve taking out "Targets" on his behalf.
Soundfrog

- Goofy Suit: Has a clearly visible zipper on his back, even in 8-bit form in the credits.
Partrick

- Animate Inanimate Object: He's a brick block with legs.
- Punny Name: His name is a pun on "Patrick" and "Part", referencing his function as the course parts representative.
Coursebot
The robot that controls courses.
- Robo Speak: Speaks in beeping sounds in the story mode.