How do you step away from your most famous creation? Mohawk artist Walter Scott is about to find out. More than a decade after creating his beloved “Wendy” series of graphic novels, Walter is taking a long hiatus from his cartoon alter-ego. He joins Tom to tell us how he came up with Wendy — a neurotic young party girl who’s trying to make it as an artist — and why his latest book, “The Wendy Award,” is going to be her final adventure for now.