There are worse descriptions, as actor typecasting goes, than "wisecracking superhero."
Then again, if you're Robert Downey Jr. and colorful descriptions are what you trade in, it could start to feel a little bit limiting.
The wheel turns quickly in Hollywood. What barely six years ago was talk of "Can Downey really pull off a superhero?" has slowly changed into "How much longer is Downey going to keep doing this superhero thing?" Four times out as Iron Man (with a fifth such tentpole, "The Avengers: Age of Ultron," on the way in May) and a couple of superhero-like Sherlock Holmes pictures, and that can start to happen.
So an actor...