Each one of the three jesters stays in character even as complete madness ensues. Dimentio, being the most cerebral and mentally stable of the trio, is the one clearly leading the show, usually staying at the center of the attention and being the leading voice. Jevil is revolving around the whole screen, accompaning Dimentio with backing vocals and occasionally joining together with him on the stage, or even becoming the leading voice for a while. Marx is definitely the craziest of the group. He's in the background screaming most of the time, but when he steps forward, he completely breaks the strange harmony created by Dimentio and Jevil, plunging the song into complete chaos. Then, when he steps back, the song reprises the chaotic yet beautiful harmony to moment where all the lyrics are on screen and you can't even follow everything that's happening at once.
A team-up between these three would actually make sense, because they have complementary abilities and if they were to join forces, each one could get what he wants:
Dimentio's main goal is to make a perfect world for him to rule, and considering that Jevil seems to have some level of omnipresence (as he can predict future events and see the "world" for that which it is: a game) he would be very helpful for Dimentio to keep around. Marx, meanwhile, serves a more basic purpose, being that with Marx's immense power (and without a weakness to the Pure Hearts), he could also help Dimentio obliterate anyone to oppose him.
Marx's main goal was to get the wish-granting Nova to wish for the conquest of Popstar. It's very likely that, upon seeing other timelines, Marx would want to bring them into submission too, so having Dimentio, who, apart from being the most clever of the bunch, is also completely unstoppable in timelines other than his own, would be an excellent help. Jevil serves a similar purpose, to an extent, but Jevil's chaotic nature would likely lead into him and Marx getting along quite nicely (while obliterating everything, of course).
Jevil's main goal is even simpler than Marx's, being that he just wants to have fun and cause chaos. Jevil is a nihilist who sees himself as warden looking into a prison cell, of sorts, so he wouldn't really care what Marx or Dimentio did, so long as it entertained him. In fact, destroying and rewriting everything is exactly the type of thing Jevil would love because it is the only type of decision that would actually matter and thus, give Jevil the purpose for which he'd been waiting for so long. Also, as Jevil says himself, "*BOO HOO, UEE HEE, HOW LONELY I BE." So having two people who would not only keep up with him, but understand "similar truths" to him, would be very, very, interesting.
The “ft. Marx” in the title likely isn’t just a subtitle saying “Hey! Marx is here too!”. It’s probably a reference to how Marx’s theme is simply called “Vs. Marx”.
The differences between their simultaneous lines about "a perfect world" really underscore the differences between them:
"But a perfect world is within my grasp!": Dimentio's part of this song is colored by the context of The Ultimate Show, rather than his more "pure" character theme in It's Showtime - this line says less about who Dimentio is than it does about when he is (also established at the beginning of the video); at this point he has control of the full power of the Chaos Heart and is about to remake the multiverse. Interestingly, despite this trio being billed as "chaos clowns", both Dimentio and Marx fit more into the Kefka archetype of "jesters that want to be tyrants but need the help of someone more powerful to get there" - Dimentio may be associated with the Chaos Heart, but rather than simply letting its activation destroy everything, he wants to usurp its power from whoever can properly awaken it so that he can create an entire multiverse that caters to his solipsistic whims. It's so classic in JRPGs that players are starting to mistrust any group in "good guy" colors, but fighting the individual troublemakers of the infernal-looking "forces of chaos/darkness" only to then have to also rail against the grand machinations of the heaven-themed "forces of order/light" is a staple mid- or endgame twist (which, interestingly, World of Light would later turn on its head).
"But a perfect world stays just out of grasp!": Unlike Dimentio (even though this line is lifted from It's Showtime), Jevil is both actually insane (rather than "merely" sociopathically narcissistic) and currently at his lowest, imprisoned by the rest of the Darkrealm for aforementioned insanity combined with his overwhelming magical power making him a threat both socially and physically. In another contrast, we don't have any evidence that this power isn't Jevil's own, other than matching the playing card theming of the game. In any case, to him a 'perfect world' seems to be one where the world knows of its own artificiality and, by extension, he is free to unleash all of his horrifying might as he wishes, as running down the hit points of others won't have as drastic consequences as the other Darkrealm natives would believe. When fighting the player, he's merely having fun before unleashing himself back upon the Darkrealm, but right when he's so close to escaping, the party actually puts up a hard enough fight to keep him contained.
"But a perfect world shatters in my grasp!": Much like Dimentio, Vs. Marx is a theme from the apex of Marx's scheming: Having successfully gotten someone else to summon the wish-granting clockwork star NOVA, he makes a wish to control his home planet. Unlike Dimentio, Marx is native to what is perhaps the most idyllic universe that gaming has ever seen; not only does he recognize the fact that the natural bounty of Pop Star provides a simple and carefree lifestyle for all, but he wants to turn that on its head and see them all suffer. There's no special metaphysical reason that everyone on Pop Star is happy, and similarly, Marx's dream of everyone else suffering has no justification. Marx knows full well that Pop Star is 'perfect', in the sense that nearly all the strife has been sealed away in the form of various nightmares, but he wants to shatter the idyllic world that is and ensure that no one can put it back together while he still reigns.
The placement of the lyrics reflects each one's mental health. Dimentio is the most sane and has lyrics that tend to stay in one place. Jevil is a bit broken and crazy, but still there; his lyrics alternate between stability and frantic movement. Marx is the most unhinged and deranged, so his lyrics refuse to stay still, just like him.
There's a youtube comment about this song by Concordia Harmony:
This does a great job to emphasize a curious difference between Marx jevil and Dimentio.
Dimentio is for the kind of chaos he can control from what I can tell. He doesn't seem to care how the future ends up, only caring that he's the one who shapes it.
Jevil is more maddened chaos. It isn't malicious, rather his insane ramblings are what he sees as the truth overall.
Marx is SADISTIC chaos. While he does also want control in a sense, you can get a vibe that he would want Pop Star specifically so he can burn it all himself.
And Grandom Rye:
I love the slight variations the jesters have in the “But a perfect world” line because it shows you exactly what type of insanity the three have.
Dimentio is given the line “But a perfect world is within my grasp!”, which obviously refers to his goals to destroy all worlds and create new ones where he’s the ruler. I mean, it should be rather obvious, given he was the one with the default “But a perfect world” line.
Jevil says “But a perfect world stays just out of grasp!”. One good look into Deltarune lore (or just anything about Jevil) and you know that Jevil knows that everything in his world is just a game. That’s why a perfect world is out of grasp for him; he knows that even if he reaches that perfect world, none of it will be real. He uses this knowledge that nothing is real to do whatever freaky and chaotic acts he wants since he knows that if he gets punished, said punishment will not be real.
Marx is interesting because he says “But a perfect world shatters in my grasp!”. Unlike Dimentio and Jevil, Marx is already living in what’s considered a “perfect world”, which would be Dreamland, the world known for friendship and peace (even if it constantly gets attacked by hellbeasts sometimes). However, rather than looking to rule over that perfect world like Dimentio, Marx is looking to destroy it. We see NOVA, the comet Marx wished upon, starts heading towards Popstar at full speed when Marx makes his wish, which seems to imply that Marx wanted NOVA to ram into Popstar, crashing into it and destroying it.
TL;DR, Dimentio wants to rule the world, Jevil is a nihilist, and Marx wants to destroy the world.
This comment from Dripsta:
This is a nice take on a Dimentio theme honestly.
"Dimentio, Charming Magician": Shows that while Dimentio appears to be a calm character, he has a malicious, psychotic side to him, and I think that having Steel voice him here was a great choice.
"It's Showtime!": Brings out that malicious side, as we find out what his endgametruly is, his vocals are pretty intense in comparison to Charming Magician, but he should know that his plan isn't guaranteed at that point, so he doesn't go completely out the rails yet. Alex just seems better for more intense songs, but then again, Megalovania exists.
"The Ultimate Show": Shows Dimentio's true colours, his psychotic side has come all out, he believes that he is truly unbeatable now, his vocals are a lot more intense than the other 2 songs, he is going all out now and would stop at nothing so that his plan would succeed, he is no longer that sneaky jester that is playing with the heroes, he is out for blood, he wants you dead, and Super Dimentio's appearence doesn't really help convince otherwise. I was honestly a bit weirded out of how calm Dimentio was in Charming Magician compared to TUS.
Now that I think about it, it feels surreal that Dimentio is a Mario villain, but i'm glad he is, brings out a certain charm for the guy I reckon.
MOTI and their associate Juno Songs each made their own take on "BIG SHOT", covering Spamton's secret bossfight and the Weird Route respectively. Spamton sings rather differently in both to reflect his state of mind in either fight.
MOTI covers his secret fight, where Spamton's song mostly consists of Word-Salad Horror meshed into a rhythm with scattered references to things like Mike. In that fight, Spamton NEO is still off his rocker, barely attatched to reality until his strings are cut, spewing all sorts of stuff that varies from vague lore to just nonsense.
Juno's cover of Spamton Neo in the Weird Route is a lot more coherent, singing more directly about his motive, with a few Freudian Slips, and he's a lot more angry. In that fight, Spamton is a lot more lucid, but is far more hostile and evil, not even caring about his strings.
In "Lavender Town", the drawings show the trainer and Pikachu completely scared for their lives, while Eevee just looks blissfully happy. This isn't just Eevee being a Fearless Fool; since Eevee is a Normal-type, it's completely immune to Ghost-type moves.
