Questions about Pandemonium

While these aren't questions, I did come up with the following ideas for locations in Pandemonium that might hopefully inspire some ideas (I believe I came up with these on my own, but if I'm stealing and don't remember, I apologize)

-Aarovore: a living tunnel which absorbs persons (technically a stretch of “living wall” that lines a stretch of tunnel but can travel). The tunnel is insane.

-Anonymous: a city where everyone wants to remain unknown. Magic aura shields all of them from divination. Residents often get violent if someone starts prying into their histories. Names are only a method of pointing blame and causing strife. If someone comes looking for someone, the visitor is likely to be roughed up, thrown out or killed. It is considered bad form to introduce oneself. Once names are overlooked, everyone can get on with more important business. You came here for a reason, and so did everyone else, so respect their right and they'll do the same. A master thief in the heart of the town can grant new identity. It is speculated by some that this thief has uses for those discarded identities, and might sell them to others.

-Brainstorm: a small town where various sages and wizards congregate. The combined focus of mental activity in the area results in furious winds and lightning storms. Those who aren’t driven insane often gain insights into various problems that had previously been unsolvable.

-Fragmentation: a city in Pandemonium where all seem sane but all suffer multiple personality disorders and they all shift at once into the personalities of the others (e.g. Citizen X takes Citizen Y’s old personality who takes Citizen Z’s). Most of the town is old, frail or ugly. If a young, strong or handsome individual arrive, the citizens try to detain him or her in the hopes that one of them will get the improved body at next jump and can then escape with their new physique (the one hope for the PC is that the unlucky residents that didn’t get the upgrade will try to detain the resident currently in the PC’s body in the hopes that they will win the desired body in the next jump)
When the PCs arrive, they might be surprised by things like the brawny fighter’s mind being trapped in the frail mage’s body. The change can be permanent or it might keep switching until a full circuit is made and all have been in the body of the other. Monsters might also be affected, resulting in things like the mind of a raving troll (“SMASH!”) in tiny kobold. Force PCs to deal with odd situation. E.g. the quiet mage now must take charge and defend. The bossy fighter is now defenseless and dependent

-Keuvun Ya'ar: town ruined by a mad solar aasimon named Dannith the Mad. He fell in love with a succubus that he rescued from a demon. In his love, he viewed her as a helpless victim and tried to bring her back to Mt. Celestia in order to wed her. He ended up killing several angelic being that tried to drive off the unrepentant devil. Later when she turned against him, he realized what he had done and has been gripped with intense grief for his rash actions. He is now insane but believes that by saving the souls in this town, he will gain redemption. His mad goals shift from day to day; but the apathetic residents don't seem to care.

-Prash’s Folly: a gambling den run by fiends from Gehenna. In this place, those who are hard on their luck can wager slivers of their remaining sanity

-Repast: a town where everyone is unusually calm and sane. It is named after an obelisk in the center of town that draws away the negative emotions. However, many agents of good have an aversion to the plinth and wonder what it is doing with the stored emotions?

-“The Madlands”: an area of tunnels burrowed through to create a terrain one would describe as badlands (hence the pun). However it is also an area that causes alter egos/multiple personalities to manifest in people (hence the other piece of the pun). Some effects seen here include:
*An area where the afflicted person takes on a second personality with same alignment but otherwise opposite in behavior. (E.g. if the PC is shy then the alternate personality is bold; if the PC is prim and proper, the alternative personality is crude and vulgar; etc. Apply penalties or bonuses based on how well they act this out – the more outrageously played, the better)
*An area where the afflicted person takes on the opposite alignment but in an exaggerated cartoony way (E.g. a paladin turns into a mustache-twirling villain with a maniacal laugh; the greedy thief turns into the cliché hippie that wants to share the world)
*An area where the afflicted person believes himself to be of a different age (e.g. the fighter turns into a lisping child that wants to play tag or the thief turns into a grumpy old man with aches and pains who is always complaining about things – especially those “young whipper-snappers”)
*Area that induces a “creature complex” where the person thinks he is a creature or monster (E.g. the cleric suddenly believes she is a magical unicorn and will nuzzle up to another PC to try to get a sugar cube.)
*An area where the afflicted person thinks he is a figure from legend (E.g. the henchman starts giving orders because he now thinks he is Conan or Gandalf) Or perhaps when the PC spots a woman, he suddenly thinks he is a cartoony Don Juan [or Pepe LePew if you prefer]
*An area where the afflicted person takes on a personality with an emotional extreme (E.g. imagine a frail wizard suddenly going into “Hulk Smash!” mode and pounding on doors expecting them to shatter and making “huge leaps” [actually just hops] to travel about)
*Another possibility is an area that induces a form of “personality” amnesia. The affected person basically becomes a blank slate that is extremely suggestible towards a new one (E.g. if another PC says “I wish there were some way to cure him” then the afflicted PC suddenly thinks he is a doctor and starts trying to take everyone’s temperature and look down their throats until another suggestion gets made – note that saying “I wish Gus would act like Gus” won’t have any effect and attempts to reset the afflicted person’s personality just by describing their old behavior shouldn’t work well)
In all of these cases, the alter ego could be permanent (until cured), or it could switch back and forth based on time (e.g. one personality in the morning, another in the evening) or could be triggered by an item or event (e.g. seeing a river or getting angry might trigger a personality shift)
In this plane of madness, perhaps an afflicted person might gain illusionary powers similar to what he believes he has (E.g. a man who thinks he is a blink dog might APPEAR to have the ability to blink about)

Good question. But they honest answer is that I'm not sure just yet.
It dawned on me that my players hadn't had too many outing to Pandemonium (combined with the fact that the place seems to make my PCs uncomfortable) so I felt like it was time to have them explore a new environment and get out of their comfort zone.

I can easily use one of the standard tropes to visit a plane (e.g. rescue someone, find someone/something with value or special knowledge, etc.) but in my effort to make the experience unique from their experiences on other planes (and Prime locations) I've been wracking my brain for the tangible ways that the themes and effects of madness might inspire and horrify them.

My current plan of attack is lanch a mini-campaign on the plane. I'll first lure them in with a seeming short-term goal (like those mentioned above) then give them a semi-secure launching point (probably Madhouse) where the dangers of the plane are somewhat mitigated (still haven't decided on the means of protection from the winds yet), then once they feel somewhat secure and get them deep into the plane (probably with the promise of some powerful bit of knowledge heard in the winds at the deeper levels), then I'll take away their safeguards and give them a sense of panic as they try to fight off insanity as they search for an escape route.

If they play well, they should be rewarded with their new secret but they should feel that they very nearly paid too much for it. And if they play poorly, the penalty should be obvious

I was reviewing some of the old posts and started thinking about this again. I was trying to imagine an area that went collectively mad and drifted over to Pandemonium. This would also provide another excuse for residents on the plane as the residents may not realize/believe that they aren't on their original plane (and it is often times difficult to change the opinion of someone who is mad and doesn't realize/accept it)

But tis idea leads me to ask, what group would make an ideal candidates to move to the Plane of Madness? Ysgardians overcome with battle rage? Outlanders that survived a psionic attack from mind flayers? Bytopian gnomes who become obsessed with their inventions? Stubborn Arcadians who become over-obsessed with their goals?
I seem to be coming up with a lot more candidates from the Lawful side of the Wheel but maybe pushing too hard in one direction catapults you to the other extreme