This is a mug shaped like Darth Vader, a well-known villain from the science fiction Star Wars films. He is a man dressed in black battle armor and wearing a black helmet. This is one in a set of six (including Yoda, Chewie, R2-D2, Vader, Trooper, and Boba). They are a tikified re-imagining of the drinking vessels that might be used if the Mos Eisley Cantina in Star Wars was actually a tiki bar.