Marx kinda got what he deserved in my opinion; it tends to be the case for Kirby villains. Sectonia became vain, cruel, and self-absorbed, so Taranza switched sides because he could no longer love her as he once did. Haltman wanted nothing but world domination and cared for nothing but it and money, so Susie basically goes and usurps her own dad.
Daroach was just a moron.
A lot of the time they get served imo and it's deserved.
Imagine waking up at 3 AM to drink some night water and you see the D-Day Knight chillin in the corner like "ay bro we outta oreos"
Also I love that one of them is literally just some rich guy from the 1890s, I'm a massive history nerd (currently a week away from my AP US History exam as I type) and I saw the name "John D. Rockefeller" and immediately did the DiCaprio point meme mentally. Very cool designs :)