Which literary movement is characterized by its preference for untamed nature, emotion, and the individual's imagination?

The correct answer to this is "Romanticism".

This is a period that began in Britain at the end of the 18th century and remained active until the half of the 19th century. Its ideas spread to America, France, Germany, Russia, and influenced many other countries, writers, and movements. An example of writers would be William Wordsworth, Percy Shelly, Goethe, Nathaniel Hawthorne, and many many more.