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For WildMassGuessing concerning specific games in this sub-series, see the below links:
[[index]]
* ''WMG/MarioAndLuigiSuperstarSaga''
* ''WMG/MarioAndLuigiPartnersInTime''
* ''WMG/MarioAndLuigiBowsersInsideStory''
* ''WMG/MarioAndLuigiDreamTeam''
* ''WMG/MarioAndLuigiPaperJam''
[[/index]]

This page is for WildMassGuessing concerning the series as a whole.
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[[WMG:Mario and Luigi will eventually team up with Franchise/DonkeyKong.]]
Bowser and King K. Rool will also join forces to fight the trio.

[[WMG:Starlow is mean to Luigi because she secretly has a crush on him.]]
Starlow finds Luigi's shy, awkward demeanor to be endearing, and treats him like a loser as a form of romantic teasing.
** She says that Luigi has a sweet moustache in ''Paper Jam'' as part of her pep talk. She wants to admit more to him but she just can't because [[InterspeciesRomance they're different species.]]

[[WMG:The next game will have Peach teamed up with Starlow as a playable character.]]
As a single character, I mean. We know from a few games that Peach has SOME platforming skills, and the [[VideoGame/MarioAndLuigiBowsersInsideStory last]] [[VideoGame/MarioAndLuigiDreamTeam two]] games reveal that wish power with Starlow is powerful enough to lift an unconscious Bowser and toss him aside, and later [[spoiler:stop Bowser from using the Dream Stone and then destroy it]]! And with Peach being playable in [[VideoGame/SuperMario3DWorld ANOTHER]] recent game, it's only inevitable. Plus this gives another sort of justification for giant battles: Peach can just wish for a giant robot or for someone to become giant or something!

[[WMG:The Brocks are an unintentional result of Bowser [[ForcedTransformation turning Toads into blocks]] in ''VideoGame/SuperMarioBros1''.]]
Bowser had turned most of the Toads into completely inanimate blocks (i.e. the ones you spend the game breaking and running across). However, some of them got stuck in an in-between form that was mobile and humanoid, but still blockish. Upon Peach being rescued, a good deal probably figured that there was no real disadvantage to being in this new form, so they decided to stay that way.

[[WMG:One of the next games will feature the Massif Bros]]
Fawful was super popular and got promoted to BigBad before being killed off, Popple and Kylie Koopa got brought back because they were popular and the series really likes bringing back [[EnsembleDarkhorse Ensemble Darkhorses]], so it seems kind of logical that the most popular non villain characters of Dream Team are likely to end up in one or both of the next two games in the franchise. And their jobs as tour guides makes it even easier to explain why the heck they might end up on the other side of the world for no apparent reason.

[[WMG:Bowser suffered brain damage during ''Superstar Saga'']]
Early in the game, Bowser gets amnesia after being shot out of a cannon, becoming Popple's apprentice "Rookie". He regains his memory in the middle of a fall from a great height, right before he hits the ground and is knocked unconscious. It's highly likely that one or both of these events gave him brain damage, resulting in his less-than-bright behavior during the rest of the series (including his failure to recognize his own past self in ''Partners in Time''). He may be recovering as of ''Dream Team'', going by his increased suaveness and [[spoiler:his recollection of Luigi's name at the very end]].

[[WMG:Bowser Jr. will never appear in the series.]]
[[spoiler:Besides his appearance in Dream Team.]]
** From the OP, jossed. He returns in ''Paper Jam''.

[[WMG:Fawful and Popple are the same person.]]
Okay, this is a big stretch. Like, EpilepticTrees big. But the only game that Fawful and Popple shared was Superstar Saga, when Fawful was just a lackey, so it would be understandable that he could appear all over the place like Popple does. Popple doesn't appear in the next game, but Fawful does in the Mushroom Kingdom sewers, hiding. Popple might not appear in Partners in Time because Fawful in in the sewers the whole game. Next, in Bowser's Inside Story, Fawful is the main villain. Popple doesn't appear in this game because Fawful was busy trying to take over the world. Finally, in Dream Team, Popple finally reappears, but Fawful is nowhere to be seen. What if the reason Fawful isn't there is because he was laying low after his defeat in BIS and didn't want to be caught, so instead he acted as Popple in Dream Team. Fawful's engrish and Popple's thick accent might both be faked. They're both beanish, and they both like to grin a lot. Of course, you'll have to believe the theory that [[spoiler:Fawful survived the events of Bowser's Inside Story,]] but still...

[[WMG:E. Gadd in these games is Fawful in disguise.]]
In Superstar Saga, Fawful sets up a café because he secretly wants to overthrow Cackletta. He tries to get away before the Bros come, but fails and is defeated. In the next game, the real Elvin Gadd invents a time machine. Fawful then kidnaps Gadd while the bros are stuck in the past. Fawful also runs a badge shop as a side business, genuinely not recognising the baby Bros. he met for himself. He also spies on the brothers with Stuffwell, explaining the E. Gadd time travel memory sequence. In the next game (similarly to the above WMG) Fawful is too busy to pose as E. Gadd, and the real E. Gadd moves back to Boo Woods in time for the events of Luigi's Mansion 2. For all subsequent games, Fawful is dead and E. Gadd is away. If E. Gadd comes back, he moved back, and if Fawful comes back, he wasn't dead.

[[WMG:M&L 6 will feature a pair of characters controlled separately from the Mario Bros.]]
Superstar Saga had just Mario & Luigi, Partners in Time had Mario & Luigi accompanied by their baby selves, Bowser's Inside Story had Bowser, Dream Team went back to having just Mario & Luigi and Paper Jam had the Bros. joined by Paper Mario. So following this pattern, the next game will have a playable character/playable characters that don't fight alongside Mario & Luigi. And since two games featured two characters, two games featured three characters and only one featured four characters, I predict that we'll get a pair of characters. My best guess would be the Wario Bros.

[[WMG:Starlow and the [[VideoGame/MarioAndLuigiPartnersInTime Star Gate]] are in cahoots to bully Luigi.]]

[[WMG: The Shroobs aren't finished with yet.]]
''VideoGame/MarioAndLuigiBowsersInsideStory'' confirmed that Bowser kept a large number of the Shroobs in cold storage after the invasion; there's an optional boss battle with three of them in the basement of his castle, and one can even be seen ''roaming free'' in Fawful Theater. Just a nice little ContinuityNod OptionalBoss, right? If that was the case, then why would the game go through the trouble of explaining the Shroob invasion and how it was stopped (Mario and Luigi recap the Shroob invasion to Starlow after the battle with the Shroob trio)? Why show so clearly that Bowser's storing Shroobs in his castle? The final nail in the coffin can be seen in the background in the battle against the Shroobs. There are many ''many'' Shroobs being stored, include Junior Shrooboids, Commander Shroobs... and the ''[[FinalBoss Elder Princess Shroob]]''. Notably, the EPS is never repeated in the background, even if you use attacks that scroll back.]]

In fact, she's placed directly in the center of the background, overlooking the battle. If this were a mere cameo, why would the FinalBoss of the previous game be displayed at all, let alone putting such effort into her being placed properly?

It's reminiscent of when Fawful made a cameo in ''VideoGame/MarioAndLuigiPartnersInTime ''. He, too, was located in a hidden basement of a castle (Peach's, in his case), and he even gives a recap of the events of the previous game... and he ended up being the BigBad of the next game. All signs point to the Shroobs returning as the antagonists of ''Mario and Luigi 4''. Either the Elder Princess Shroob will be resurrected and lead the Shroobs, or a team of Shroobs will attempt to free her, possibly by cooperating with Bowser for a while.

[[WMG: The Shroobs tried to invade because their own planet was dying.]]
In the intro it was stated that they were looking for a new home. They were probably doing this because they were probably running out of resources and/or had caused major non-reversible ecological damage to it and it was becoming uninhabitable. They saw the Mushroom Planet had a good source of renewable energy (Vim) and for the most part was unpolluted, so they decided to go there.

[[WMG: Tying into the above WMG, [[AlwaysChaoticEvil the Shroobs]] [[SubvertedTrope weren't inherently evil]].]]
...But they had the misfortune of having the quest to save their species be spearheaded by two of its most ruthless members, those being Princess Shrob and [[spoiler: her sister]]. As seen ''[[VideoGame/MarioAndLuigiBowsersInsideStory Bowser's Inside Story]]'', one lone Shroob was quietly sitting at the Fawful Theatre, presumably to enjoy the show. That's unusually peaceful behavior for a race seen as AlwaysChaoticEvil, until one takes into account that they weren't frozen like with the Shroobs seen in the castle's freezer. It likely adapted to living in the mushroom world for a while now as TheMole [[BecomingTheMask before eventually integrating into Bowser's Kingdom]] after years of not getting bossed around by Princess Shroob. Why do the Shroobs in the Ice room still attack the Mario Bros? It's probably because they were frozen not long before or after the fall of the Shroob race and were likely still thinking the war is happening and attacked on instinct.

[[WMG: We've already seen the setting for the 4th ''VideoGame/MarioAndLuigi'' RPG]]
Remember [[VideoGame/MarioAndLuigiPartnersInTime our last RPG romp through time?]] What with all of the throwbacks to ''Partners in Time'' in ''[[VideoGame/MarioAndLuigiBowsersInsideStory Bowser's Inside Story]]'', many have been predicting the return of the Shroobs in the next game -- going by this (and [[spoiler: the Elder Princess Shroob]]'s last line [[note]] "YOU MAY HAVE BESTED ME, BUT SHROOBS WILL LIVE ON... ONE DAY, THE SHROOBS WILL DANCE ON THE BURNING REMAINS OF THIS PATHETIC KINGDOM..."[[/note]]) I'm going to to ahead and guess that, like our last Shroob encounter, this game will use a time-travel system and take place in the far-future of the Mushroom Kingdom.
* Jossed. The 4th ''M&L'' game is set in an original location, Pi'illoid Island.

[[WMG: If there is a fourth installment in the ''VideoGame/MarioAndLuigi'' series, it will be on the UsefulNotes/{{Wii}} or UsefulNotes/WiiU.]]
For their first three games, the ''VideoGame/PaperMario'' and ''VideoGame/MarioAndLuigi'' series have been exclusive to home consoles and handheld systems, respectively. Since ''VideoGame/PaperMarioStickerStar'', the upcoming fourth ''VideoGame/PaperMario'' game, is going to be on a handheld system instead of a home console, perhaps the reverse will be true for an upcoming fourth ''Mario & Luigi'' game.
* Jossed. ''VideoGame/MarioAndLuigiDreamTeam'' was for the Nintendo 3DS.
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