Real Name: Humphry Dumpler
Occupation: Criminal
Marital Status: Single
Base of Operations: Gotham City
Height: N/A
Weight: N/A
Eyes: N/A
Hair: N/A
First Appearance: Arkham Asylum: Living Hell #2 (2003)
Created By: Dan Slott, Ryan Sook

Humpty Dumpty was fascinated with taking things apart and then putting them back together. He would sneak out late at night to disassmble and reassemble mechanical devices which had upset him in some way. As his sole knowledge about their workings came from books borrowed from the public library, the "fixed" devices caused numerous accidents.

Humpty's final crime resulted in several of the various giant objects situated on Gotham's rooftops collapsing into the streets, which inspired a law banning such devices. When Batgirl tried to apprehend him for this, he fell off the rooftop. She saved him- but dislocated her arms in the process. Humpty, being far from aggressive, promptly slipped her arms back into her sockets and surrendered himself to her. Revealing that she had tracked him by his overdue library wthdrawals, her sole request was why he had withdrawn a book on human anatomy. Humpty placidly took her back to his home to reveal he had killed his abusive grandmother with an axe, then attempted to sew her together again with bootlace. It was likely this crime that resulted in his being sentenced to Arkham Asylum.

He was a model prisoner at Arkham Asylum. However later ee joined Luthor's Society, as shown in the pages of Villains United.