Here's my vote for next Batman villain (if they don't bring back Ra's)
The Ventriloquist is a DC Comics villain, an enemy of Batman.
A meek, quiet man, the Ventriloquist plans and executes his crimes through a dummy named
Scarface, with the dress and persona of a 1920s gangster, complete with pinstripe suit, cigar, and Tommy gun.
Born into a powerful Mafia Family, Arnold Wesker develops multiple personality disorder after seeing his mother murdered by an assassin from a rival Family. Growing up, his only outlet is ventriloquism. Years later, after a barroom brawl (in which he kills someone during a violent release of his repressed anger), Wesker is sent to Black Gate Penitentiary. He is introduced to "Woody" - a dummy carved by cellmate Donnegan - thus resulting in the birth of Scarface.