Fantasy is characterized by imaginary and unrealistic elements. It typically involves supernatural powers, like magic and magical creatures. Fantasy stories often contain elements of Medievalism, such as palaces and fortresses, warriors, rulers, magical weapons, feudalism, and references to ancient spells.
If you like this genre but are interested in stories that are largely told through pictures, remember that the graphic novel format can include ANY genre—not just superhero stories and manga. So be sure to check out that collection as well.