Okay, since Socks! is such a deprived child, let's have some pictures! As well as a brief description of each.
Batman:

Also known as (shh) Bruce Wayne. Batman, a vigilante who is very mean to bad guys! He stalks the night in his bat costume and brings justice to all! (I hate him *glare*)
Harley Quinn:

Also known as Harleen Quinzel. Originally the
Joker's therapist, he drove her insaneand now she roams the city by his side.
Scarecrow:

Also known as Jonathan Crane. Bullied as a child, he turned to the only weapon he had: fear. As he grew older he created chemicals that caused people to hallucinate and witness their worst fears. In some aspects he has multiple-personality-disorder, Crane being one, Scarecrow being the other.
Mad Hatter:

Also known as Jervis Tetch. A mad Alice in Wonderland obsessed scientist who created mind-control chips in the shape of cards with 10/6 on them. When placed on people, these chips allow him to fully control them with his mind with the help of a headband attached to the inside of his hat.