Click here for Wild Mass Guessing for the series as a whole.
Bowser wasn't suffering from Amnesia at all. He knew full well he inhaled and swallowed up everyone. He was pissed. It was Disproportionate Retribution for everyone continually thwarting and defying him. The Mushroom Kingdom is his, which includes its inhabitants. When the means to punish them for kicking him out presents itself via Fawful, he rampages right back there. With them in his possession, Bowser had no intentions of interacting with the Marios, lest they escape and start screwing up his plans again, leaving them to the mercy of his body. When Fawful initiates the next stage in his scheme to revive the Dark Star, he abducts Peach from the Koopa King's fat gut, he rages "Put her back!", revealing he knows what he's doing.
This makes their escape in the ending all the funnier; Bowser claims he's disgusted the Marios (he didn't care about the Toads) were inside him the whole time, unwilling to admit it was his own deliberate intention all along.
Midbus' pigmask insignia serves to suggest he is a Chimera.
I just saw this on the Mario wiki. Makes an odd sort of sense.
Somewhat confirmed. In the original game, the background of the fight depicts what appears to be a spiky structure with a consistent, pulsating energy moving inside. It is connected to what look like veins with nodes. One of the veins even forms the shape of a heart. The 3DS remake makes it even more obvious that the battle takes place near Bowser’s heart. The shell-shaped structure is now clearly beating, and pink energy or fluid slowly moves through the veins connected to it.
It should also be noted that the last time the Bros. appear before the final boss is in the Chest Station, which would logically be somewhere close to his heart.
It seems logical because those are the only major areas that don't have a pipe leading to them in-game and there aren't many other places for the pipe to go. The only question is where the other red pipe is.
But it was changed at some point in development, likely because of how large Blubble Lake is and how small the other two areas are by comparison.
The Junker robot is an early model of a robot (Likely a Jailgoon, Mechawful, or a Dark Mechawful), or a new robot that was cancelled altogether, that was discarded because of how uncontrollable it is and/or because newer versions were developed, but Midbus liked it and gave it a trash can as armor because it was thrown away before it could get real armor. The Junker Cans are just regular trash cans, but are controlled by the enemies inside it. The Junker Cans that don't have any enemies in them are actual robots that were confused with trash cans, hence the garbage inside them, or they were given trash to make them more like real garbage cans. It's also possible that the Junker Cans were part of some automated trash disposal service and were in the trash either dropping off garbage or because they were thrown away.
We already know that he has access to soul-containing technology from the first game; what if he designed a device to collect his soul should he die? Then, in Mario & Luigi: Partners in Time, we see Fawful collecting beans for some unknown purpose. What if he used those beans to create a backup body for himself? Given the wackiness of the Marioverse, it's not that unlikely that Beanish folk are actually made of beans. Though he's an Engrish spouting goofball, he's also smart and dangerous enough to conquer Peach's and Bowser's castles by himself and almost bring about The End of the World as We Know It. Surely Fawful is smart enough to have some sort of backup plan. So, when he exploded, his hypothetical device would hypothetically attract his soul like a magnet and then put it in his hypothetical artificial bean body! It makes perfect sense, kinda!
Considering an image of it appears on the Lor Starcutter's sail during the fight with it and Magolor in Kirby's Return to Dream Land and that it carries the star motif (albeit in the Mario style) and is so hugely powerful like so many other Ancients-linked artifacts, it seems plausible the Dark Star originally crash-landed in the Mushroom Kingdom from Kirby territory.
- It may also be related to Dark Matter — "Dark" prefix at the beginning of the name, ability to possess, unknown origin, powers over shadow, etc.
To the point where it reveals what made them decide that it's an "extreme error of judgement" to trust him.
- Jossed. The Elite Trio does not appear during the main story in Bowser Jr.'s Journey.
- Jossed. Midbus appears in a few cutscenes early on, but does not appear after that.
Popple can be a boss for Jr.'s mode, getting into battle with him somehow. Peasly can be vacationing (like Starlow before him) in the Mushroom Kingdom where he comes across Jr., one thing leads to another and he ends up tagging along on Jr.'s quest (possibly out of an Enemy Mine situation against Fawful).
- Jossed. Neither Popple nor Peasley appear at all.
Hey, someone had to make the Disgaea reference…
This idea was born from the fact that when Bowser sucked up the pipes in the forest when he got the 'Lucky' Shroom, we saw no holes in the ground and there were clumps of grass sucked up as well. Of course, it all could just be the people in charge of making the game-sprites not wanting to go through the extra effort of making holes in the ground or damaging Bowser's Body with pipe-lines.