Real Name: Melissa Harley.
Occupation: Vigilante, real estate agent.
Other Aliases: Harlequin.
Birthplace: USA (Newhaven).
Relationship Status: Currently dating Echo.
Known Relatives: None.
Group Affiliation: Arkham City Sirens.
Base of Operations: Arkham City.
Known Powers: None. Madcap uses blunt weaponry like baseball bats and custom-built hammers to subdue criminals.