{"data": [{"alias": "Mr. Freeze","name": "Dr. Victor Fries","gender": "Male","appeared": "1959"},{"alias": "Poison Ivy","name": "Pamela Lillian Isley","gender": "Female","appeared": "1966"},{"alias": "The Penguin","name": "Oswald Chesterfield Cobblepot","gender": "Male","appeared": "1941"},{"alias": "The Joker","name": "Jack Napier (according to some)","gender": "Male","appeared": "1940"},{"alias": "Harley Quinn","name": "Dr. Harleen Frances Quinzel","gender": "Female","appeared": "1992"},{"alias": "Mad Hatter","name": "Jervis Tetch","gender": "Male","appeared": "1948"},{"alias": "The Riddler","name": "Edward Nygma/Nigma or Nashton","gender": "Male","appeared": "1948"},{"alias": "Catwoman","name": "Selina Kyle","gender": "Female","appeared": "1940"},{"alias": "Two-Face","name": "Harvey Dent","gender": "Male","appeared": "1942"}]}