Is the Apocalyptic Protagonist in the Book Amazing?

It's the end of the world. Why does this world have a protagonist? Why is it that the protagonist is so evil anyway? That's just the later stage. The protagonist is killed in the early stage. The protagonist is invincible in the early stage, so why not kill him anyway? There are many protagonists, and all the big mushrooms are cleared. Therefore, I can't solve the protagonists in the end of the world in the book. I specifically target the unsatisfactory protagonists. This novel and its characters are purely fictitious. Any similarity is purely coincidental and should not be imitated.