The only details we know about the rich man—whose story Jesus told in Luke 16—are what Jesus revealed. And Jesus revealed all that He felt was necessary to make His point.
For example, Jesus gave us no idea how the rich man gained his wealth. It is possible that he gained it legitimately, providing value to willing customers. But we don’t know, and Jesus didn’t say. Jesus did reveal, however, that the rich man was self-indulgent and self-absorbed. He dressed in very expensive clothing, “joyously living in splendor every day” (Luke 16:19).