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Before Super Mario World, Koopa Troopas walked on all four legs.
Contributed by Kakariko Kid
According to the Mario Kart Double Dash and Mario Kart Wii official guides, the character Daisy is Princess Peach's cousin. However, there are no official sources or in-game evidence that confirms this.
Contributed by MeleeWaluigi
According to a interview with ABC News, when Shigeru Miyamoto was asked why Daisy and Wario aren't a part of the main Mario titles, Miyamoto replied that "Both Daisy and Wario were originally drawn as part of the "Mario Land" games and had the same illustrator. The art style of those games was different from the "Mario World" series with Mario, Luigi and Princess Peach, and for a long time that was the reason that we didn't have those characters enter into each other's stories." Despite this statement, Wario did appear in the DS update of Super Mario 64 and Mario faced off against the enemies of Wario Land 3 in Dr. Mario 64. This not only explains their absence in main Mario games, but also might explain the lack of direct representation of their games in the Mario spin off games in terms locations, enemies, characters, and special moves such as Wario's iconic shoulder bash.
Contributed by Jumpco
According to a Nintendo documentary, Wario is Mario's childhood friend who grew up with the same plumbing skills.
Contributed by chibirobo
According to a Nintendo Documentary, Mario's favorite music is not only Opera, but Euro-Pop as well.
Contributed by chibirobo
According to Eiji Anouma, Miyamoto got the idea of naming Mario from Marionette. Marionette is a puppet controlled from above with strings or wires. Miyamoto also made puppets during his days at school where he would display his puppets in front of the class.
Contributed by Artwark
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Next Level Games, who developed Super Mario Strikers, Mario Strikers Charged, and Luigi's Mansion: Dark Moon, had pitched to Nintendo a Mario volleyball game titled Super Mario Spikers. Called during development as simply Mario Volleyball, it featured wrestling mechanics and presented with hints of a TV game show. It was intended for the Wii and work began on it around the end of 2006. Development was canceled in 2007 after the pitch had failed with Nintendo. The game was financed as a reward from the studio's previous work on the Strikers games.
Contributed by KnowledgeBase
In the Mario Kart games, Rosalina is a heavy/large class character. However, in Super Smash. Bros for 3DS and Wii U she is a light class character. The reason she is a heavy class character in Mario Kart is most likely due to her height.
Contributed by Takahashi2212
Mario has starred in over 200 different games.
Contributed by Psychospacecow
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According to a 1993 Nintendo Character Guide, Yoshi's full name is T. Yoshisaur Munchakoopas.
Contributed by RadSpyro
Princess Daisy's country of origin, Sarasaland, takes its name from the calico textiles imported by Portuguese traders from India to Japan during the Edo Period. Calico became widely popular in Japan to the point the Portuguese word for it, sarasa, was adapted into the Japanese language.

Calico (or sarasa) textiles are most commonly flower patterns made up of multiple, contrasting colors. This is why it is ruled by Daisy, a flower-inspired princess. And just as animal color patterns are named after the fabric (i.e., calico cats, calico goldfish, etc.) it's name alludes to the fact it is comprised of multiple, diverse kingdoms. The reason it is written as "Sarasaland," is because of the poor localization for the English release of Super Mario Land. In Japanese, it is: サラサ・ランド. Properly translated to English, it would be: Calico Land. A space or hyphen can be used in place of the interpoint.

Subsequent descriptions have rendered the name differently, as well:
•The ''Official Game Boy Players Guide'' omits the word land completely: "Sarasa"
•The ''Super Mario Land 2: 6 Golden Coins'' manual spaces the name out, but still leaves calico untranslated: "Sarasa Land"
•The Daisy trophy in ''Super Smash Bros. Melee'' hyphenates the name and leaves the 'L' in "Land" lowercase: "Sarasa-land"
•Daisy's ''Mario Superstar Baseball'' profile misspells sarasa with "ra" added on the end: "Sarasara Land"
Contributed by Outfoixe
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Nintendo has depicted Mario (previously Jumpman) with hair and no hat since the NES and Famicom. But in the early artwork for Donkey Kong, Mario was bald.
Contributed by Gamer#1
Ever since Mario's debut in 1981, there hasn't been a single year that a Mario game hasn't been released.
Contributed by Factshunter82
Before he became the voice of Mario, Charles Martinet was a Shakespearean actor. He even based his Mario voice on the character of Gremio from The Taming of the Shrew.
Contributed by TB Tabby
Koji Kondo, the composer of various Mario games, tries to make music that people can repeatedly listen to without getting sick of. He would listen to his own music for hours to see if he would get sick of it or not.
Marc Graue, Ronald B. Ruben and Charles Martinet are the only people to voice Mario in the video games. Marc Graue and Charles Martinet would later go on to voice the characters 'Mr. Zurkon' and 'Orvus' in the Ratchet and Clank Future Trilogy.
Contributed by Linneus
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A street in Spain, in the suburb of Zargoza, was named "Avenida de Super Mario Bros." as a tribute to the Mario series. The name was chosen via an online poll for the newly built neighbourhood with plans to name more streets after other video game series.
Contributed by KnowledgeBase
The Mario Party series has been awarded the title of the "Longest Running Mini-Game Series" in the Guinness Book of World Records Gamer's Edition. (2009 - 2013)
Contributed by Funland47
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The 'P' in "P-Wing" stands for Paratroopa or Patapata (Japanese name for Paratroopa).
Contributed by weegeechan
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All 8-bit sprite tiles have only three colors plus transparency as a fourth color, but Bowser's original sprite from Super Mario Bros. appears to have four colors as well as transparency as a color. This is because the black background is what gives Bowser his black spiked collars around his wrists. Due to this, using cheat codes so Bowser appears in a non-castle level will look like his hands are separated from his arms. This occurs again in Super Mario Bros. 3 where Bowser's sprite is designed to exploit the black background and use it as an outline element.
Contributed by REX Legend8
Charles Martinet (the current voice for Mario, Luigi, Wario, and Waluigi) was actually not invited to the auditions to be the new voice of Mario. He crashed the auditions and was just asked to do an Italian accent until he ran out of things to say. He knew nothing about Mario going into the audition, and since he was told that he was going to talk to children throughout the game, he started to do a more playful and gentle voice instead of the traditional gruff Italian accent that Mario had before. Martinet left so much of an impression at the recording that his tape was the only one sent to Nintendo.
Contributed by gamemaster1991
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Luigi's name comes from a pun on the Japanese word ルイージ¸ or ruiji meaning "similar." Since all of his sprites in earlier games were just recolors of his brother's sprites, and his name was Italian like Mario's was, it seemed to fit him.
Contributed by gamemaster1991
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Bowser's Japanese name, Kuppa (pronounced Koopa), was named by Shigeru Miyamoto after the Korean dish Gukbap, roughly known in Japan as 'Kuppa'. Other dishes considered were Yukke ('Yukhoe' in Korean) and Bibinba ('Bibimbap' in Korean).
Contributed by KnowledgeBase
According to Shigeru Miyamoto, neither Mario or Luigi have surnames. The Super Mario Bros. film has Mario and Luigi's last name as Mario, but this was because of a scene where the two had to provide their full name.
Contributed by KnowledgeBase
Mario's hair is brown, while his mustache is black. This was because around the time of Super Mario Bros. 3, Mario's creators wanted him to have a definite hair color in game, while it was easier to draw his mustache by extending the black outline of his nose.
Contributed by wiz85
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According to Nintendo via a Nintendo Direct "Year of Luigi" announcement, Mario and Luigi are twins. It's also been stated that Luigi is the youngest.
Contributed by wiz85
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On the cover of Super Mario Bros 3 Mario's overalls are different compared to Super Mario Bros 2. Instead of having a blue sweater, and red overalls, it was changed to be blue overalls, and red sweater. It has stayed the same ever since.
Contributed by retrolinkx
An issue of Nintendo Power revealed that Shigeru Miyamoto got the idea for Boos from the wife of his co-worker and close friend Takashi Tezuka, as she is shy but one day got very angry at him for coming home late from work. Boos were also originally named "Boo Diddleys" after the late blues singer and guitarist "Bo Diddley".
Contributed by DidYouKnowGaming
The reason Mario has a cap and mustache is because his creator, Shigeru Miyamoto, wanted to avoid animating Mario's hair and drawing his mouth. He thought they would be difficult to do correctly in such a small space.
Contributed by DidYouKnowGaming
According to Shigeru Miyamoto, the koopalings aren't actually Bowser's children, despite the Super Mario Bros. 3 manual stating that they were.
Contributed by DidYouKnowGaming
Shigeru Miyamoto wanted Mario to have a dinosaur companion ever since Super Mario Bros. but it wasn't thought possible at the time due to the limitations of the NES. He wanted to implement Yoshi in Super Mario Bros. 3 but again could not. Two power-ups were created to fill the gap - raccoon and frog Mario. Co-worker Takashi Tezuka once speculated that Miyamoto's love of horse riding had influenced Yoshi's creation.
Contributed by DidYouKnowGaming
According to Mario Bros. developer Takashi Tezuka, there was a stage in Super Mario World's development when Yoshi was a Koopa. A relic of this idea is Yoshi's shell-like saddle.
Contributed by DidYouKnowGaming
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Shigeru Miyamoto had originally intended for Bowser to be an ox, and based him on the main antagonist from the animation "Alakazam The Great". This is likely why his modern design has horns and a defined muzzle, despite him being a turtle.
Contributed by DidYouKnowGaming
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NSFW - This trivia is considered "Not Safe for Work" - Click to Reveal
There are two pornographic parody movies based on Mario called "Super Hornio Brothers" and "Super Hornio Brothers II". Nintendo actually owns the rights to the movies, as to make sure they would never be released again.
Contributed by DidYouKnowGaming
Mario was not Mario's original name, and nor was Jumpman. When Miyamoto created the prototype of Mario, he called him "Mr. Video" and planned to put the character into many games (possibly as cameos, as he did with Mario). But even before then Mario was called "Ossan" which means middle-aged guy.
Contributed by DidYouKnowGaming