Role-playing games often use a common set of creatures that are easily recognizeable and have pre-determined traits. Most are based on mythology in some form or other. The Dungeons & Dragons Monster Manual contains many of these as well.
... time without a legitimate basis of authority.
The first to have the title of "Tyrant" was Pisistratus in 560 BC.
In modern times Tyrant has come to mean a dictator ...