Romita Jr told the crowd that the original pitch for "Kick-Ass" was missing the actual character Kick-Ass. the comic, still titled Kick-Ass was just set to star characters Hit-Girl and Big Daddy as they tried to take down crime lord John Genovese.
Eventually Millar decided to add a new character named Kick-Ass, so the series became built around him.
Romita Jr also said his favorite part of Kick-Ass was Hit-Girl, which he felt was the obvious answer.
The artist apparently did not show his son the one nude panel from the Kick-Ass comic, but showed him all the blood and gore, which he did admit was strange of him.
Romita also regretted putting his son as an extra in the film because then he would have to let his son see the movie. Apparently his sons small appearance made his sons friends want to see the movie so he had to tell the kids parents not to let them see the movie. He also said he completely geek-ed out in the theater when he saw his name at the beginning of Kick-Ass.
Romita also gave reason as to the delay of the Kick-Ass comic series and why it differed from the movie. Apparently while doing work on "The Amazing Spider-Man" as well as the Kick-Ass comic and film, he had to sacrifice one. The choose of what to drop ended up being the actual comic the movie was supposed to be based of after being pressured by the studio to get the film out as soon as possible. The studio ended up going a different way with the movies ending after months of delays from the comics.