Shirley the Medium is a Chihuahua with a frequently occurring role on the show as an anti-heroine/anti-villainess. She is voiced by actress Mary Testa. Shirley is a tiny green Chihuahua with purple eyelids, long eyelashes tipped with small gold balls, a purple nose, and black paws. She has heterochromia, her right eye has an orange iris and the left one has green and orange coloring. She wears an oversized golden earring on her right ear. Her attire consists of a green dress covered by a purple cape and a blue hood. Shirley is a mystical fortune teller whose primary pastime is casting curses on those who defy morality. She despises the greedy, the wrathful, and the inhospitable, and subjects them to spells that only repair when their sins are reversed. Ironically, she is very fond of money; charging heavy fees on clients and selling herself on TV are some of the ways she obtains it. This is probably because she is actually poor (as shown in The Curse of Shirley) while living on the outskirts of Nowhere in her gypsy wagon. It may also be out of a desire to punish Eustace, whom she charges the most and whose actions annoy her the most. She commonly refers to Eustace as "the stupid one" because his mother Ma Bagge calls him "stupid boy", just like how he calls Courage "stupid dog" and seems to have a particular grudge against him. She seems to not mind Muriel and seems to have at least a mutual relationship with Courage. She can also play the saxophone well and uses this to attract money. In Swindlin' Wind, her curses are based on the crimes the couples have committed against her, and she removed them (without being asked) after seeing one member of the couple show concern for the other, smiling as she does so.