Madara Problem
The Madara Problem is when a writer makes a character so goddamn strong and unstoppable that nothing in their whole universe can touch them, and the writer is stuck either making them weaker (which is a total waste) or killing them with a stupid cheat move.
My main character is so powerful, even the end of the world can’t kill him. I had to make him die with a magic bullet from a random guy in a alley.
The villain is so strong, I had to kill him with a power-up from a pizza delivery man.
I made my character immortal, and now I have to kill him with a magic sock from a random kid.