Adaptational Jerkass

While some adaptations make a character nicer, this is the opposite, making a character more of a Jerkass than they were in the original work

While there is some overlap with Adaptational Villainy, the key difference is that a character isn't necessarily villainous. It can be a hero who was made into an Anti Hero, or a villain who was Affably Evil is now Faux Affably Evil.

Compare Took a Level in Jerkass.

Film

 * Death Note: While Light has always been a murderous Villain Protagonist, the live action film series makes him even worse. He becomes more evil more quickly than either the anime or manga, to the extent he's perfectly willing to personally kill his own father to prevent the Death Note from being organized.
 * The oft-mocked scene from Harry Potter and the Goblet of Fire where Dumbledore, instead of calmly asking Harry if he had placed his name into the Goblet, immediately starts yelling and interrogating him.

Web Original

 * Stupid Mario Brothers has several examples, all Played for Laughs:
 * Far from the happy-go-lucky hero of the games, Mario here is a selfish Lazy Bum who does such things as refuse to cut his vacation short to rescue Peach from Bowser again, on top of.
 * Princess Peach of the game series is a Nice Girl through and through. This Peach is a whiny, nagging Spoiled Brat.