Emergency incident response varies dramatically based on incident type, size, and response duration. Robots will facilitate response planning and maintaining awareness, remove responders from dangerous situations, and allow for immediate site feedback prior to human responder entry. Introducing new robots to emergency incident response can affect the human responder command hierarchy's workflow, decision-making, and responsibilities. Thus, understanding the relationship and interaction roles humans in the response system can assume when robots are added is critical. Large-scale emergency incidents (or response systems) can involve thousands of responders and many thousands of civilians and victims. The primary contribution is the classification, based on five components, of response system individuals to ten roles that encapsulate the hundreds of potential responders, bystanders and victims. A new role, the abstracted supervisor is also defined.