Who are the characters in Robert Stone Cold?

It seems you might be thinking of "Stone Cold," which is a nickname for Steve Austin, a famous professional wrestler.

However, there is no known fictional character or story called "Robert Stone Cold."

Could you please clarify your question? Are you asking about:

* Characters in a specific story or movie? Please provide more details about the story.

* Characters in a video game? Please provide the game title.

* Characters in a TV show? Please provide the show name.

Once I have more information, I can assist you better!