So first there's going to be the lore dump, then a quick campaign summary, and then the most recent bit of worldbuilding.

Lore

In an alternate timeline, Earth is contacted by a race of extremely intelligent blue-colored aliens, known as the Iruki
Their motives are mysterious, but they quickly establish relations with human leaders and set up Starfall Base on their initial landing site in Japan, which will eventually grow to the Iruki city of Starfall
They bring with them the Konchu, a subjugated race of enormous bug-like creatures, whose strength, endurance, and chitinous plating over much of their bodies make them ideal muscle
Several years pass, and humanity's technology is advancing by leaps and bounds, although this masks that unease is rising; humanity is growing mistrustful of the Iruki's outward generosity and increasingly confident in their own ability to handle this themselves, the Iruki brass are arguing amongst themselves what their mission entails, and the Konchu are beginning to suspect that the Iruki are up to nothing good behind the scenes
The situation has turned into a powder keg ready to blow at any moment for any reason, but its catalyst will come in the form of another unexpected arrival from the sky
Early one winter morning, an Iruki listening post picks up a familiar signature approaching New Zealand
It belongs to a liveship of the Ekara, a race of semi-nomadic bird people with whom the Iruki had previously tangled (and against whom the Iruki may have committed war crimes, though the record is incomplete)
A visual is acquired, and the vessel is seen to be limping heavily and sporting damage inconsistent with known weaponry
Hours later, the vessel crashes in the ocean near Auckland, and a swarm of amphibious escape pods is observed escaping from the wreckage and making its way towards land
An emergency meeting of top Iruki brass is called: all recognize that the detachment is far from ready to deal with the arrival of the possibly vengeful Ekara, let alone whatever caused that damage to their liveship, but Flight Commander Valon is firmly of the opinion that diplomatic relations must be established, while First Lieutenant Lania is convinced that both humanity and the Ekara must be subjugated in order to prepare the planet for assault from space by an unknown enemy
A fight breaks out, and Lania shoots Valon with a space laser, thereby assuming command of the detachment by international law of go fuck yourself
Lania immediately proceeds to the base's research labs to retrieve an incomplete viral bioweapon their scientists had been developing, flies to New Zealand, and releases it into a waterway near Wellington
As it turns out, the Ekara are immune to the virus, but humanity is not: within a year, 90% of the human population has been wiped out, and the remaining 10% are clustered into the remains of once-mighty cities and entirely reliant on Iruki technology for survival, while being told that the virus was of Ekara origin
However, the Konchu have finally had enough of serving a government of genocidal psychopaths and, along with a small number of sympathetic Iruki defectors, revolt, fight their way out of Starfall, and disperse across the world to attempt to help humanity rebuild and the Ekara to clear their name

It's against this background that our campaign story begins (well, sort of. Going into session one, I knew that most of humanity was dead, that the Iruki had subjugated the Konchu, that the Ekara were also there, and had written literally none of the rest of it).

Adelaide, Australia, many years after the Great Plague
Mike The Mechanic, a thirtysomething human artificer more comfortable around vehicles than people, is working on a vehicle repair when Edie Unpronounceablename, an aboriginal halfling ranger, walks in
She's walked all the way from Alice Springs and needs a drink, but would rather have one with someone else than by herself
It takes some convincing, but Mike grudgingly agrees to leave his shop and walk her to the local saloon
Inside, the two encounter Mushi Bushi, a Konchu monk with a very serious demeanor but who regularly makes Jojo's Bizarre Adventure references
He's on the hunt for a bandit leader who's been causing trouble in the area around Adelaide
He's heard that they have cool motorcycles
Mike is instantly convinced to lend a hand

These three take down the bandit, then trace his funding source to an anarcho-capitalist warlord in a nearby town with connections to the Iruki, so after connecting up with Vollyte, an NPC Iruki defector wizard whose human wife and mixed son (who was going to become a fourth PC until the player ghosted me) were both killed in what he suspects was an assassination to send him a message (and no, I don't really want to think about, uh, "human-Iruki relations"), plus James, a gnome barbarian with a pet drop bear named Beary, and Captain Kangaroo, a highly trained attack kangaroo that decided Edie was its mother after Mushi probably gave it a severe concussion, this colorful band of misfits proceeds to take on and kill the warlord.
However, Vollyte is very nearly killed in the fight, and elects to let his adventuring days conclude there, just as a young Ekara rogue NPC named Aerie who helped the gang get into the warlord's bunker decides this adventuring life is great, and she's going to tag along.
Following this, the gang makes a terrible movie, steals two airplanes, gets trapped in a dimensional disturbance over the Pacific Ocean, lands in Mexico in a timeline where the movie was really good and celebrity versions of themselves also exist, light a bar on fire, almost get kicked out of a casino, learn that there is a plot afoot to steal the mythical Lifetime Disney Pass, a mysterious ticket to Disney World that predates the Plague and is apparently followed by weird, supernatural incidents, go to a lake, fight each other, fight a giant lake monster with Mickey Mouse ears, fight a kaiju Beary with Mickey Mouse ears after he eats the pass, which is also how the previous monster got like that, send James diving down Beary's throat to retrieve the Pass, then take a boat to Florida and fight a giant shark before arriving in Tampa Bay.
Now, finally, we get to the worldbuilding I did this week that I thought was really cool.

Current Session

The party's boat is guided in to shore by an enthusiastic older man in a pirate hat, with a pirate accent, wearing an old Tampa Bay Buccaneers T-shirt
He greets all happily until seeing Aerie, at which point his expression sours and he begins hurling invective
The party extricate themselves from this encounter and head into The Navel Tavern, a dockside bar with what can only be described as a very sexy orange on the sign outside
Inside, they're greeted by a human entertainer in an orange dress playing an out-of-tune piano, who introduces herself as "Florida's own Clementine O'Range" before launching into a truly mediocre piano ballad rendition of "State Of Florida" by Less Than Jake
The bartender is a tired-looking Konchu serving a clientele of about half and half humans and Konchu
Aerie and Mushi approach and Mushi remarks on how nice it is to be among his brethren
The bartender introduces himself as Arukoru and explains that following the revolution and exodus, many Konchu made their way to sailing towns upon realizing that their size, strength, and toughness made them ideal sailors: as a result, Tampa is now about 60% Konchu
He also apologizes to Aerie on behalf of "Bucky," the dock pirate, explaining that his family died in the plague when he was a child and he believes the Iruki that it was the Ekara's fault, and not to take it personally
He finally notes that the bar is supposed to be called The Valencia, and The Navel was meant to be a strip club downtown, but the signs got mixed up in a shipping error just before the plague hit and, long story short, just ended up staying where they were, so now The Navel is an orange-themed bar by the docks and The Valencia is an orange-themed strip club downtown, because doesn't that just figure
Asked about Disney World, his mandibles retract in such a way that a human's face might turn white, and he says he doesn't like to talk about that place, nobody who's returned from there has ever reported making it past "the guard dogs," and you'd be better off talking to Detective Tantei at the sheriff's office down the road
So Mike marches down to the sheriff's office to meet with Detective Tantei
He's a gruff, no-nonsense Konchu who runs a tight ship
Asked about Disney World, Tantei seems pensive
He explains that he's got his own reasons to be suspicious of Disney World, as he has seen a string of disappearances in recent weeks
Human, Konchu, and even an Ekara, any age, any gender, the only pattern is that each and every one of them had come into possession of some item of vintage, pre-Plague Disney memorabilia shortly before going missing, and Disney World seems the only logical culprit
Normally, he says, he would send some of his own men there to investigate, but it would be a suicide mission: he only feels comfortable asking Mike for help because "it's no chitin off my facial plating if a bunch of misfit strangers get themselves killed trying to get past the guard dogs."
As this is happening, Aerie and James at The Navel have struck up a conversation with an Ekara named Megan, a paladin with an array of impressive biocybernetic augmentations that appear to be of Iruki origin (yes, this is a new PC)
Upon being shown the pass, she confidently proclaims it to have been the pass of someone named Swoozie, a former Disney employee who did an expose on them and was subsequently disappeared
She paints a bleak picture of Disney as an evil empire that will permanently silence its critics without even a second look, and the pass itself as an object of immense power that must not be allowed to fall into the wrong hands
Aerie says "you sound like an authority on the subject: why don't you go there with us and help us get in?" and Megan replies "Make me an offer"
So James challenges her
I swear to god
To a Yugioh duel
I allow this because I reward audacious thinking, and long story short, James wins and Megan agrees to join

And now I have to figure out WTF "the guard dogs" are.