May be OOC. Don't read if that bothers you. There will be plenty of original elements and major plot changes.
The red-haired Archer regretted the words he had blurted out in a moment of impulse, so he decided to spread the King's renown in the new world.
Yae Publishing House: "The latest masterpiece by bestselling author Cui Beishang, The Legend of the Knight King, is now on sale. First come, first served."
Passerby 1: "I'll buy it to learn how to praise people."
Passerby 2: "It's a good book, but it really lays it on too thick. Killing a dragon with ease is something you only see in novels, after all."
The purple-haired swordsman regretted conspiring with the Queen to stir the human emotions of the King. So he decided to split himself in two and serve at the King's side.
Saber: "My King, I have done wrong. Please punish me."
Berserker: "...aaaaaaaaa, Arthur!" He swings his sword at him.
The rebellious son and the puppet ruler bent on becoming a god hit it off at first sight. Together, they sounded the charge against their father/mother.
Looking at the girl beside that person, a girl who looked just like him, the rebellious son said, "If I destroy everything you care about, then you'll only have eyes for me."
The puppet who ascended to godhood: "Beelzebul, I have become a god!"
Really, why should any of them be consumed by regret? The merciful King would never blame them for their mistakes. He would only think that he himself hadn't done well enough.
Theme: A good appetite is a blessing.