A sales person. This will force you to sit up straight and smile as you speak, sounding more natural to your recipient. This is where you must shine. You need to establish rapport with the interviewer. Be professional, but not too much unlike yourself you want to appear to be in control.
Companies look for winners - hard working, eager to learn, problem solving, confident individuals.
They want to know that you are willing to develop long term relationships with customers and be able to interact with peers and supervisors. Give me a situation that you were able to take control over. Tell me about your typical day. Prepare a portfolio of accomplishments. Work out answers to the above questions and have them in your folder.