Has Star Wars inspired many parody films? Are Star Wars merchandise depicting characters from the movie available? Considering #1 and #2, are there no depictions of characters outside the movie?
Darth Vader
Star Wars is one of the most widely parodied film series to be produced. Star Wars merchandise, from tees to Halloween costumes, is widely available and is plentiful. 
fictional character in the Star Wars franchise
Is watching  Star Wars necessary to know who Darth Vader is?