- "If I had it my way, we wouldn't waste our time-you'd be inside already."
- ―Mr. Roncero discussing the terms of Billy's probation along with Chad.
Mr. Roncero is a minor character in The Lost and Damned. Mr. Roncero was one of the employees along with Chad at the rehabilitation centre trying to help Billy Grey overcome his addiction to heroin. He seems to dislike Billy, and warns him to stay out of trouble or else he would end up in jail. When Billy replies with a smart alec remark, Roncero makes an advance towards Billy but stops, and goes back inside. He is never heard from again after this point.
Mr. Roncero is voiced by José Ramón Rosario.
- The Lost and Damned