The vilain is required to stand there and yell "IT CANNOT BE" upon defeat, instead of trying to dodge or block.
A pretty vilain is much stronger than an uglier vilain, who will be dumb too.
Nothing can stop the MC when they get enraged and taps into their true power.
The hero is often dumb, brash and hot-headed to the point of stupidity, but always got a gigantic untapped potential that far eclipse older, more skilled people.
If there's a dude with white hair, he's a filthy ****ing traitor.