Of course not.
No
All of them.
Robert Downey Jr. was arrested for being a drug addict between 1996 and 2001 right after he a seaon on Ally McBeal. He went threw a lot of drug treatment.
Caucasian?
Robert Downey Jr. Interview
Robert Downey Jr. on Sherlock Holmes
Robert Downey Jr. at Iron Man 2 Premiere
2011 Globes: Robert Downey Jr.