Dave Lizewski, a.k.a. Kick-Ass, the main protagonist:
Hit-Girl, an 11 years old, purple wig wearing assassin:
Her father, Big Daddy:
And Red Mist, son of the story's antagonist:
Personally, even if the idea of an 11 years old killer of is more than a little disturbing, but the kilt and purple bob are kind of cute!