The weirdest idea for a story that I feel like I've ever come up with would either be my comic/manga Pokémon fan story, or my comic story called Athanasia. Both of them are actually started and have enough story to get in depth feels for the characters.
The Pokémon story follows a kid named Grey Takeshi. He lives on a small island that's very heavily, but secretly full of crime, housing the largest organization of criminals called The Underworld. Grey starts his journey following his dad's dream of his son using a cherish ball, a particularly weak ball used primarily on Pokémon that won't fight being captured, to catch his first Pokémon.
After a week of failure to find a Pokémon to catch, he nearly gives up. However, he has a chance encounter with a very rare, very special, and very dangerous Pokémon, the unique colored Regigigas. Grey returns to the professor to get his Pokédex and start his adventure. The professor suggests he stays home for the night, but Grey becomes over excited, and heads out late at night.
The professor shows up at Grey's house, captures his mother, kills her Pokémon, Joltik, then proceeds to torture her to find out where Grey took the Regigigas. With no hope of getting info, he kills Grey's mother, then burns the village to the ground out of rage.
The other story follows Kyle Stone. A young man stuck with the power to live forever. I don't mean like, until the world is destroyed. I mean FOREVER! The end of the world. The end of every world. The end of the stars. The end of the universe. After everything disappears, it leads to millions of years of nothing. An empty void that contains nothing...except Kyle.
Eventually, another big bang occurs, starting the creation of a whole new universe. However, it develops and grows to be exactly the same as the previous universe, showing that all things move on a fixed track, with Kyle as the only X-factor to change it, which he does!
Sometimes, he'll be the great hero of the people! Other times, he's the walking death! Sometimes, he doesn't interact at all. Other times, he makes himself an untouchable force that everyone fears! Through experiments, he'll change certain factors to see how humanity will change! Things ranging from something as small as causing all ladybugs to go extinct, all the way up to seeing how humans would live if ladybugs were sentient, god-like beings!
Nothing is off the table for Kyle Stone, and the only thing that can stop him is his own depression. Not only does everyone around him die during his eternal lifetime, but despite knowing he could easily transfer the power to someone else, he knows they'd also eventually get to the point he's at, and feel the same exact way, and doesn't want anyone to suffer as he is.