Okay, I'm working on a game which is mostly done in solid colors, the villains in this game are flashy body builders, think barrier trio from mother 3. Anyways, the colors are just placeholders I'm just trying to figure out figure out shape at the moment

thanks for the help!

So i've been working on an exploration platformer for some time and I've got pretty much everything in the engine and the only thing standing between me and finishing the game is a plot line. I've been a really big fan of the mother series' plot lines, mainly mother 3 whose ending was sad enough to make me cry haha. So i was wondering what everybody likes in a plot line and how you go about creating one?

I've been working on a platform shooter game influenced heavily by cave story and mother 3 for quite a while now and I just realized I don't really have much of a plot figured out! So I was hoping people on here would be able to help me flesh this one out!

Here's what I have as a backstory so far:

A long time ago an enormous monster appeared on the earth. It began a rampage across the surface, destroying cities, leveling mountains. The humans, peaceful in nature and caught off guard by this sudden destruction, were unable to fight back. As the monster continued its rampage a board of the humans most acclaimed scientists, architects and engineers assembled to construct something to fight off the monster. What they created were 4 very large, self sufficient robots. These robots were programed to consume any non living matter and convert it into littler robots used for fighting off the monster. They functioned sort of like a bee hive, with the 4 large robots acting like queens.  They were programmed to do this until the monster had been destroyed.

Eventually the robots won the fight, scattering pieces of the monster across the earth, but not without heavy human casualties. Not needing the protection of the robots and figuring that the program that would cause the robots to stop multiplying had taken effect, the humans buried them deep in the earth along with all the other waste caused by the monster's rampage.

Unknown to the humans the robots did not stop multiplying. The monster had not been completely destroyed because pieces of it, capable of still secreting its 'children' still existed and therefore the robots still had work to do and the program to stop them was not yet in effect. The monster had as well been spread so finely and so widely throughout that it was impossible for the robots to locate every piece. They continued to live underground, eating away the rock and minerals until enormous caves and tunnels wound throughout the earth. So much so that parts of the surface were beginning to collapse into the caves. These caves are filled with many different inhabitants

This is where you come in. Walking one day through hills, the ground begins to shake and collapse beneath you. You fall down and down until eventually landing unconscious upon a bed of leaves at the bottom of a cave. Your initial goal being to escape from the cave back onto the surface, you begin searching for a way up. On your way you encounter a robot who when you get near becomes scared and runs away from you.


Things I know youll have to do througout the game: destroy the robots so they stop reproducing and eating away at the earth.
Find out about the robots
There will be primitive underground races that you will run into and be your "home town" sort of thing? I want to have the underground races very primitive at first, but when the earth begins collapsing things like tvs and other modern things fall in, in a cartoony sort of way
Things I need:
a plot-in a very mother 3 esq way
a villain
how you discover you need to destroy the robots
quirky characters

I'm looking to avoid having the monster come back in any sort of way, except that you may have to destroy some of his left over pieces or something

Anyways if anyone would want to give me their opinions on this so far it'd be greatly appreciated!