So I recently wrapped up writing Angel of the Bat III: Da Pacem Domine, the longest singular piece of fiction I've ever written and what I'm pretty sure is going to go down as my fanfic magnum opus. It's my intention to be done with fanfic writing now, but I am writing little post-mortems on my old, unfinished stories. My opus was, after all, an adaptation of an idea that never came to fruition. If anyone else feels inspired by this or any of the other post-mortems I'm going to write, I only ask that you let me know, because I'd love to read whatever you come up with.
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I feel like it doesn't take much to guess what direction this story was going to take based on the description I wrote. Our villains with cheese pun names (in my internal notes I called them the, "Fro Majin", as in fromage + majin) came to earth to find a new host for their demonic leader, Casu Marzu. Thinking Mr. Satan is the world's strongest warrior, they released Casu Marzu into his body, and are initially disappointed that he clearly wasn't the one to defeat Majin Buu after all. However, they also discover that the world's populace is still more than happy to give him their energy, so they start setting up increasingly dangerous looking scenarios where Casu Marzu, in Mr. Satan's body, would ask for help, stealing energy from the world in the process, like a bunch of people duped into giving to the Tree of Might. All of Casu Marzu's underlings are in on it with him, most of them serving as "villains" but Zerella acting like a love interest and hype woman. Acho is a shapeshifter, he carries most of the load, doing stuff like turning into a Godzilla parody and stuff like that only for Casu Marzu to beat him down.
Earth's true heroes get wise to this and start trying to intervene. But with cameras facing Casu Marzu/Mr. Satan on the constant, attempts to fight back only lead to the increasingly weak majority of the planet continuing to donate their energy. Gohan nearly gets the upper hand in one of their fights, but backs off when he realizes Casu Marzu is happy to suck all his followers dry if push comes to shove. We get at least a passing mention that the real Mr. Satan is actually enjoying knowing he's so powerful again, and as long as he thinks they're not hurting anyone evil, he's happy to go along with it.
Casu Marzu eventually announces his own Cell Games-like tournament (as in, he is the only opponent, everyone else fights him) and has the whole planet watching for the outcome. Vegeta and Goku each take their shot then, but the constant donations of energy from earth make Casu Marzu too powerful to overcome.
I never exactly figured out how the final fight was going to shake out. In some versions, the story was set a little while after Pan's birth, and a crying Pan would force Mr. Satan back to his senses enough to start willingly giving energy back to the earth, weakening him enough for Goku to finish him off. In other versions, Vegeta, enraged by the idea of being beaten by Mr. Satan, even a demon alien possessed Mr. Satan, snaps, beats him to a bloodied pulp, and Casu Marzu attempts to jump ship into his body, tempting Vegeta with the thought that together, he would be strong enough to defeat Goku. But Vegeta, over the thought of defeating Goku with anyone else's help, rejects the offer and he and Goku kill Casu Marzu together. There was even one version when Gohan plays psychologist during a fight with Casu Marzu, reminding Mr. Satan that he was never the strongest on earth, but he shouldn't burden himself with being that, he's already a beloved celebrity, a cared for father, and a caring grandfather, which also loosened Casu Marzu's control enough to let the decisive blow be landed.
As I mentioned before but will clarify now, all the bad guys had cheese-based names that I tried to adapt the way Dragon Ball does with its silly names. Acho for nacho, Issa for swiss, Shedda for cheddar, and Zerella for mozzarella. Casu Marzu is the name of a cheese all by itself, being a kind of sheep's milk cheese that's left so maggots can lay their eggs inside it and their larvae can give it a certain tang. Sounds disgusting, never had it, it's illegal around much of the world. But it does kinda fit, funnily enough- both in how it's dangerous and it gets a gross little thing wriggling inside of you.
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Again, if anyone wants to use elements of this to tell your own story, I only ask that you let me know. As I said, I'd love to read what someone else comes up with out of my outlines.