I hate it when I read novels when the enemy pleads and vowed to give his everything to the MC, the MC doesn't accept it and kills the latter.
Like why can't the MC just give up on an enemy that likes, has killed hundreds if not thousands and surrendered when rendered nothing against the MC.
And to make it more believable that the enemy actually pleaded to give his entire body or everything, why can't they show an example of simply cutting their limbs, ears, poke eye with knife, pull out the heart and give it to the MC.
Man, villains these days are so uncreative, can the MC's be even be called human if they can't forgive killers and criminals to make the world less boring. They can't even see the opportunity to use the villains before they're all dried up, dead.
If one tries to assassinate the MC or rob him while he's sleeping, if the MC manages to end up caughting the latter, then throws her inside a room where no light passes through, lock her/him there and wait form her/him to develop feelings for you.
If the MC does not believe the villain's or the criminal's words, torture him until he gives up and obey every command the MC ordered.
Or if the MC finds the begging person before him/her, the MC must accept that it cannot just leave garbages behind everywhere he goes, he have to keep them of use. Examples: turning them into dolls, inanimate objects, statues, collections like every warrior has a set in their home.
....
NGL, this is the best idea if the author decides to make a thriller and evil MC novel.