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For the most part, things were kept fairly in line with the source material. Both the source material and the films have a real-world feel (meaning no one has superpowers and when someone is dead, they’re really dead), have a comedic tone, and feature characters with identical or only slightly altered names. But there were a few changes that were substantial and, most would agree, logical. What were those changes? Let’s find out.
1) Red Mist Is Fully Evil in the Comics

There were a few changes to the Red Mist character from source material to movies. For one, his last name was changed from Genovese to D’Amico. But the bigger change came in who he was. In the movies just as in the comics, he goes from the son of a well-known gangster to the grieving son of a well-known gangster to a villain all his own: the Motherf***er.
In the comics he is even more pathetic, even less likable, and goes so far as to gun down several children during the neighborhood attack (in Kick-Ass 2, both in terms of book and movie). Because of Christopher Mintz-Plasse’s presence, the character was naturally given a bit more humor, but even without a comedic actor inhabiting the role they would have had to excise that shooting kids part. The source material gives us a better look into Chris’ head, and it’s all narcissism, lack of empathy, and cruelty. He’s not a kid who feels pressure to impress his gangster father, he’s a weak young man who uses his father’s death at the hands of Hit-Girl to become what he’s always wanted to be: a murderer.
Speaking of the death of Chris’ father, the fate of Frank D’Amico is different from that of John Genovese in the comics. We still get a big battle with Kick-Ass and Hit-Girl vs. all the gangsters and both renditions of the boss still die, but in separate ways. In the comics, Kick-Ass shoots off his genitals, which then gives Hit-Girl enough times to whack him with a cleaver. In the movie, Kick-Ass has a jet pack decked out with big machine guns which he uses to take out the remainder of D’Amico’s men then uses Big Daddy’s bazooka on D’Amico himself. That in and of itself is a departure from the comics. In the source material, Kick-Ass doesn’t really kill people, in the movies he does.
2) The Assault Scene During the Neighborhood Attack

In Kick-Ass 2, the movie, the Motherf***er and his gang go on the aforementioned neighborhood attack. And, like in the source material, they choose that neighborhood because Kick-Ass’ love interest lives there.
But, in the movie, it’s Night B***h, one of Kick-Ass’ fellow heroes whereas in the book it’s Katie Deauxma, who doesn’t even have any interest in Kick-Ass (more on that particular relationship in a bit). But that’s not the only change here, as, in the movie, when the Motherf***er tries to assault Night B***h, he is unable to do so. His impotence is played for laughs. In the comics, however, he is able to assault Katie and does so.
3) Big Daddy’s Origin (& Mindy’s Mom Being Alive)

Nicolas Cage has dabbled in the superhero world throughout the years. And, between him almost being Superman and being Spider-Man Noir, he was Big Daddy. And, in the movie version of Kick-Ass, his Big Daddy is a former cop whose wife was killed by Frank D’Amico and his spent years preparing for revenge, systematically tearing apart D’Amico’s enterprise, and training his daughter, Mindy, to do the same.
In the comics, all of this seems to be the case, too. But it’s all a lie. Big Daddy is just a delusional comic book obsessive who has been selling old issues of comics to fund his whole imagined revenge crusade. Mindy’s mom is still alive and desperate to reconnect with her daughter. He wasn’t even a cop. He was an accountant. It was a smart change to make. Having Big Daddy turn out to be a liar about every aspect of his life to his own daughter wouldn’t have worked with the tone of the film at all. Another change to Big Daddy came in the form of his costume. His garb was the biggest departure from the comics. In the movie he looks like Christian Bale in The Dark Knight whereas in the source material he’s wearing a reddish-brown mask, a red shirt, red pants, and a long black coat.












