Here are mine:
Everyone in the Mushroom World is born with a "Wa-" counterpart.
Think about it. We know Wario isn't a clone. We know he and Mario aren't related. We know Mario isn't the only one with a rival that looks like an ugly version of himself (Waluigi and Boshi). We know Wario was apparently brought by the stork around the same time as or shortly after Mario according to YIDS. Unless the above three examples were sheer coincidence, I have reason to believe everybody in the Mushroom World is destined to have some sort of ugly rival counterpart. One can only imagine what Peach's looks like....
Peach is Princess Serenity and Rosalina is Galaxia.
This of course means Mario is Tuxedo Mask and Daisy is Sailor Jupiter.
Bowser is a metalhead.
Just look at him...
Prince Froggy is a teenage Wart.
Would explain why he has an army of Shy Guys and Snifits and Harry Hedgehog (who shares the Japanese name "Harimannen" with Porcupo) at his disposal.
Birdo is Wart's failed attempt to create a Yoshi clone.
He tried to make his own gender-ambiguous dinosaur that shoots eggs. The results were... less than he expected.
Daisy is either:
a) the butch in her relationship with Luigi.
b)a lesbian and is using Luigi to cover it up.
She acts rather....masculine in Mario Strikers.
Mouser is a hyper-evolved Squeek.
They used to be called "Lil' Mouser" for a reason.
Mario and Luigi were born and raised in whatever unnamed region where Camelot's Mario Golf/Tennis RPGs are supposed to be set.
Mario has apparently become some sort of athletic mythical hero in the present day.
Peach is the daughter of a human woman and a Toad man.[/u][/u]
Would explain why her grandmother is a Toad in Mario RPG. My assumption is that her mom was the Toad because of how closely children resemble their parents in Mario's world.
Sex doesn't exist in the Mushroom World.
All babies are brought by the stork. Kissing seems to about as promiscuous as anything ever gets if Paper Mario 2 is any indication.
The Koopalings are Bowser's nephews and niece. Not his kids.
Would explain why they all look different. Would also explain why they only ever refer to them as his "underlings" in NSMBWii. Also gives Bowser Jr. a more meaningful existence as Bowser's son.
Morton's dad looks like Gene Simmons.
He is modeled after Paul Stanley, after all...
Roy is partially blind.
That's why he wears sunglasses all the time and generally has pretty poor aim.
Lemmy has Systemic Hypoplasia.
That's why he's so small compared to the other Koopalings.
The X-Nauts were a sly parody of the Xbox.
Just look at Magnus Von Grapple...
Mario was a massive overachiever in his youth.
Throughout high school and college he took on golf, tennis, baseball, soccer, basketball, volleyball, hockey, dodgeball, boxing, gymnastics and various olympic sports. He got PhDs in medicine and archeology, then got BAs in fine art, programming and cooking. After graduating he decided to become a plumber/adventurer.
Diddy Kong is an orphan.
Kong Isle seems to be mostly populated by apes, rather than monkeys. DK is the grandon of Cranky. Candy is DK's girlfriend. Chunky is Kiddy's brother. Tiny is Dixie's sister. Both Chunky and Kiddy are Dixie and Tiny's cousins. Diddy seems to be the only one without any real family, and there's no way he's DK's biological nephew. My assumption is that DK adopted him, like how Batman adopted Robin.
Dixie Kong is a commando of some sort.
That's why she wears the beret and the kneepads. She's also probably pretty handy with a knife.
Goombella screwed up and actually meant to say Marilyn was a boy, not Vivian.
Really, Marilyn is the most masculine one. Just look at her.
Flurrie and Ludwig regularly go to the same hair salon.
Their hair looks awfully similar...
Lemmy's hair is a dye job.
He has a little blond ponytail on the back of his head in NSMBWii...
The babies were sent to the present time on some sort of special mission that involves having to play lots of sports.
Why else would they be there?
The second Luigi in SMG was the result of Luigi winning the title of "Superstar of the Universe" in Mario Party 3.
He's the default character of MP3's story mode. The cursor is on him at the start. He's the only one without his own Star Stamp. Canonically, he's supposed to be the winner. In return, the Millenium Star granted his wish by making a much braver and stronger clone of Luigi that lives out in space.
Mr. Hoggle is a smuggler from Diamond City hiding out in Glitzville. The Yoshi Kid's egg was stolen goods.
Where else could he have gotten it? Come to think of it, who in their right mind would want to eat a Yoshi egg anyway? Something about that has to be illegal. I say he's from Diamond City because it has a sizable talking animal population. He fits right in.
The Yoshies on Isle Delfino were made by the Gaddbrush's goop, if not mutated by it.
That's why they only come in three convenient colors and melt when they touch the water.
Having your shoes taken away and being forced to walk on all fours is a form of punishment in the Koopa Troop.
It's either that or getting burned to a crisp. Your choice.
Goombas are telekinetic.
That's how they can carry stuff.
Ratooeys are a near-extinct species.
We've seen a grand total of two of them.
The Mushroom World's TV stations can transmit signals across dimensions.
That's how Francis was able to see all those shows he obsesses over.
Mario's hat is the source of his power.
He's twice as weak without it. They even use it as a visual cue for "one hit left" in Super Mario 3D Land.
"Plumber" is Mushroom World slang for "adventurer".
Think about it. Mario, Luigi, Wario and Waluigi appear to be the only plumbers in the entire world but none of them do any actual plumbing.
Waluigi doesn't work for WarioWare because Wario didn't tell him about it.
He knew Waluigi would want a cut of the profits if not find a way to steal all of them outright. Plus he'd probably be able to make better microgames and faster given his technical prowess. Wario wouldn't have any of that.
Mario got his castle in SML2 the same way Wario got his at the end of WL1.
He found the genie and gave him 99,999 coins. The reason he wished for it was so he'd have a place to hide from the paparazzi.
An explosion that permanently kills a Bob-Omb is more powerful than one that doesn't.
That's why they only use it as a last resort. The actual power of the explosion probably still depends on the Bob-Omb's level of strength.
Rosalina's storybook wasn't fully autobiographical.
There's no way she could've been on the comet for that long unless she's immortal, and I highly doubt some random girl from Mario's planet can suddenly live forever. Everybody's game has to end somewhere.
Time passes quicker on DK Isle than it does in the rest of the Mushroom World.
That's why Cranky is old and Tiny had that growth spurt. DK, Diddy and Dixie haven't aged as much because they've been spending a lot of their time playing sports in the Mushroom Kingdom.
Winky the Frog died after the events of DKC.
His stuffed corpse is clearly seen in the background of Cranky's Monkey Museum in DKC2.
The machine in Wart's room was a food dispenser that malfunctioned shortly before Mario and co. arrived.
It was set to only make his favorite food, but the malfunction caused it to only make his least favorite food.
The fruit from the Super Happy Tree only works on Yoshies.
We've yet to see anybody else using their restorative powers. Not even Baby Bowser used them and it was right there in his room.
Brown Yoshies are rare.
Again, so far we've only seen two of them. Other colors are considerably more prevalent.
Booster Tower used to be a four-star hotel.
Then the Booster family steadily got more and more insane over the years and converted it into an indoor daredevil obstacle course.
The Shy Guy's mask is its face.
It contorts and makes expressions in Mario Strikers Charged. It's totally a removable face. The little robe thing is its body.
The Painting Worlds from SM64 are Galaxies.
Would explain the nature of Throwback Galaxy. Also explains why all the worlds are floating in a void and have Power Stars littered about.
The Power Stars are similar to the One Ring.
Whenever Bowser gives one to a boss character, it corrupts their mind. Look what happened to that Wiggler in Tiny Huge Island. This also explains why everybody competes so ruthlessly in Mario Party.
Booster is a Berserker from Final Fantasy.
He wears a little viking helmet, has a crazy beard and seems to operate purely on impulse.
Tatanga lives in the Space Zone.
Can't think of any other place he could originate from. I imagine the 3-Up Moons are his people's equivalent of Shine Sprites.
Those angry stars in the Space Zone are disgruntled Star Kids who were kicked out of Star Haven for misbehaving.
Tatanga then decided to enlist them as bodyguards.
Bowser = Jango Fett
Bowser Jr. = Boba Fett
Koopa Kids = Clone Troopers
What I mean is that Bowser made a clone of himself in the form of Bowser Jr., then tried to make an army of clones resulting in the Koopa Kids. They're so incompetent Bowser only uses them to crash parties. I say Bowser Jr. is a clone and not an ordinary child because he looks like an almost exact copy of Baby Bowser. PiT in particular even gave Baby Bowser a bandana around his neck.
More to come later...
Edited by Ventricle, 17 August 2012 - 05:22 PM.