The game's plot is not the result of negative continuityAt the end of the first Mario Galaxy, Rosalina and her Lumas managed to save the universe, basically by creating a Big Crunch and rebuilding the entire thing from scratch. Mario and most of the characters he encountered in his quest are "reanimated" in a freshly-created Mushroom Kingdom, itself part of a grand, unified Galaxy. However, Super Mario Galaxy 2 can't be a direct sequel to this, since the Star Festival happens once in a hundred years, and Mario is still kicking around, not a day older. So, the game is set in an alternate universe concurrent with the events of the first game, to be "merged" into a single timeline following the events of the second game. In other words, yes, Super Mario freakin' Bros now has a split timeline theory.
Only Mario, Lubba, Rosalina, Peach, and (maybe) Bowser remember the events of the first Super Mario Galaxy
The first and second game are an Alternate Continuity to each other; the first half of Galaxy is now Ret Gone.To expand on the above theory, the two games are part of a Zelda-esque Split Timeline. The Gainax Ending of Timeline A (Galaxy) sent Mario back in time to just before the Star Festival, which is where the continuity branched off into Timeline B (Galaxy 2). However, doing so removed Mario from Timeline Anote , thus preventing him from defeating Bowser— to prevent a Temporal Paradox, someone was sent to do it for him: Luigi. He was also sent back in time, but instead to a point early on in Timeline A, taking Mario's place (while keeping the previous Luigi where he was, which accounts for the two of them). While Luigi was (re-)collecting the Timeline A Stars, Mario went on his merry way, collecting all of the Timeline B Stars (and encountering Luigi-B and Toad Brigade-B, among others). The first game's Grand Finale Galaxy is the result of the timeline being fused back together.
The orange Luma that is controlled by player 2 is an Orange LanternThink about it: the Luma glows bright orange, it can't be hurt, and it has an insatiable greed, allowing it to pick up any and every item and hold them indefinitely. Clearly the Luma is trying to fuel its greed and will eventually lead Mario to Larfleeze, where he will be turned into a corps member himself.
The game is still a sequel to the first, but the Negative Continuity is because nobody remembers the first gameWhen the universe was rebuilt at the end of the first game, time was essentially reset, so this is one of the few in-universe justifications for Negative Continuity.
Super Mario Galaxy 2 is a retelling of Super Mario Galaxy.As shown by the secret ending, Rosalina was the narrator all along. As it turns out, she was reading to her Lumas from another storybook. This theory posits that the universe was NOT reset in the ending of Super Mario Galaxy, nor was an Alternate Timeline created, but that it was simply Rosalina entertaining her "children" with a story. Supplements to this theory: Supplement 1) This allows for the possibility that Super Mario Galaxy 2 is set far in the future, with Rosalina telling the story of the now long-passed Mario & co. to a new generation of Lumas, including the reborn Luma he originally had the adventure with. Supplement 2) Another possibility is that Rosalina actually has Haruhi-level godlike powers, and in fact created another universe that follows her telling of the story.
Whomp's Fortress is a painting of the Throwback GalaxySomeone had gone to the TBG before Mario and painted a picture of it. By leaping through the canvas in Super Mario 64, he was literally transported there, one of the few stages in the game that conspiciously are just a landmass floating in the middle of nowhere; that's why the pink Bob-Omb recognized him. Alternately, he was just in some sort of "painting world" separate from reality, explaining why the Whomp King says the same thing, line-by-line, in both games; the real McCoy hadn't met Mario yet.
The game is a direct sequel to the original, and it follows from the Grand Finale Galaxy of the previous game.Bowser just couldn't give a break for even 2 seconds.
In the end, Rosalina is introducing herself to Peach.Notice how Peach has never actually met Rosalina before.
Rosalina, a disguised shroob princessThe first notes in the final boss music of Mario and Luigi: Partners in Time shares the melody of the first few notes in the Storybook song (from the 1st game, but also appears in this game). So perhaps Rosalina is really another shroob princess?
Mario and co are immortal, and Galaxy 2 is simply 100 years after the first.Or they're just very long-lived and age slowly, since Rosalina seems to have come from the same world as well and is at least several centuries old. All of Mario's adventures / Bowser's plots might have taken place over the course of hundreds, or even thousands of years, with many years in-between each one.
How Luigi got up there.Okay, this might be a little crazy, but think about it a bit. When you first meet Luigi, he says "I had to hustle to get up here" which means that he had a hard time. He has no mode of transportation with him. Very soon after, Lubba will mention "Your brother seems really proud of how high he can jump." ... You know what I'm thinking, don't you? That Luigi got there by jumping from planet to planet, galaxy to galaxy from the Mushroom Planet. It seems ridiculous, but Luigi has revealed on a few occasions that he jumps even higher than he normally shows, once even jumping high enough that a ton of dust is kicked from the ground and sucked after him because of the low air resistance.
The infinite flutter jump 'glitch' was put in on purpose.
The Hell Valley Sky Trees are The Anti-Spiral.And he/they are specifically observing Mario as a potential serious threat, given how he's shown repeated usage of Spiral Power abilities; increasing his body mass instantaneously (Super/Mega Mushrooms), altering his physical composition to give himself unnatural abilities (Fire Flowers, Ice Flowers, The Metal Cap), and at one point even being able to alter the dimensional orientation of space at will. Compare the two: Hell Valley Sky Trees and The Anti-Spiral.◊ Extrapolating from this:
Rosalina, and all her Lumas, are (or were) all Elite Spiral Warriors.Rosalina is really, really, really old, but kept looking youthful by her vast reserves of...Spiral Energy; she only appears to lack hot-bloodedness she's overpowered and slightly lazy (compare: Lordgenome On His Throne and she'd rather let Mario do the work. The Lumas are living beings that regularly explode into galaxies, which is exactly what the Anti-Spiral stated would occur during the Spiral Nemesis, and Mario's Luma gives him the ability to attack by spinning. Finally, the top of Rosalina's Observatory spins like a drill when it flies, and THEIRS IS THE DRILL THAT CREATES THE HEAVENS!!
The Hell Valley Sky Trees are Endermen.They're black, humanoid creatures with blank eyes. Look similar?◊
This isn't the first time the Hell Valley Sky Trees have appeared, it's just the first time we've seen themSeeing the Sky Trees was a fluke at best, an accident that one gamer made and noticed them before spreading the word. But they could have been MANY places before Freezeflame. In many games, lurking in the shadows, waiting to ambush our poor Nintendo characters. Possibly all at once....
Rosalina is deadThat's why Rosalina looks so young but is still able to survive the hundred year gap between visits to the Mushroom World. In the first game she says she always looks forward to passing by it, which indicates that she's survived enough time to pass it multiple times, making her multiple centuries old. And if Boos have taught us anything it shows that death isn't a permanent departure from the living. And it would explain her ability to float. Perhaps a diet consisting entirely of Star Bits can't sustain human life forever...
Lubba is related to Patrick Star