Re: Can anyone tell me the best way to try and get a message to Robert Downey jr please?
Unfortunately, contacting the agencies listed on this site under "contact information" will be your best chance of getting the message to him. Just make sure it is addressed properly, and has the proper postage so they can return it to you.
I really hope you do hear back from him. I know just from being a fan myself how excited I would be if I got a message from him.