Final answer:
In a democracy, you will find a congress, parliament, and a prime minister as part of the governing structures, but not a dictator, which signifies an authoritarian regime.
Step-by-step explanation:
Within the context of a democracy, certain characteristics are commonly found such as a congress, parliament, and a prime minister. These structures and roles underscore the democratic process where elected officials and representatives develop and enforce legislation, while also leading the government in varying capacities. A congress and parliament constitute the legislative bodies that enact laws and oversee the government, while the prime minister typically serves as the head of government, particularly in a parliamentary system.
On the other hand, a dictator is a form of ruler not found in a democracy, as this implies an authoritarian or totalitarian regime where the political power is concentrated in the hands of a single individual, often obtained and maintained through non-democratic means. This contrasts with the democratic principle where power is vested in the people and exercised directly or through freely elected representatives.