Shaggy-headed supervillain from the "The Legacy of Mr. Banjo!" story in DC comic book Billy Batson & the Magic of Shazam! #10 (January 2010).
He also appears in issue #20 (November 2010).
He's the son of Golden Age villain Mister Banjo. So... "Mr. Banjo" wasn't just a name he picked, it was his actual last name?!