The Penguin

Oswald Chesterfield Cobblepot, also known as The Penguin, (voiced by Paul Williams and Bob Joles) is one of Gotham City's most dangerous criminals who later hid his activities under the guise as a trendy restaurateur as owner of the Iceberg Lounge.

Unlike most of Batman's rogues gallery, the Penguin was not insane, as he would be sent to Stonegate Penitentiary if found guilty of a certain crime, instead of Arkham Asylum where his "fellow rogues" went for rehabilitation.