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.
... (1848)
Aesthetik des Hässlichen (1853)
Die Poesie and ihre Geschichte (1885)
Studien (1839-47)
Neue Studien (1875-78).
He published also an autobiography entitled ...