At 6'2" he was the tallest actor to have played the Joker in a (non-fan-made) live-action Batman production. Heath Ledger was six-foot-one and Jack Nicholson was nearly five-foot-ten.
Has never worked directly with George Clooney, but Clooney has starred in two remakes of movies Romero was in. Romero played the Joker in "Batman" (1966), and Clooney played Batman in Batman & Robin (1997). Romero also appeared in the original Ocean's Eleven (1960), the remake of which--Ocean's Eleven (2001)--starred Clooney.
He believed that to live well you must dress well. And never in the same outfit. His closets held 30 tuxedos, 200 sports jackets, and 500 suits.
His maternal grandparents were exiled Cubans Carmen and her invalid husband, Manuel Mantilla. Their daughter, María Mantilla--Romero's mother--is generally believed to have been the daughter of Cuban poet and revolutionary hero José Martí, who also wrote "Guantánamera" ("Yo soy un hombre sincero . . . ").
Is one of two Batman villains to share roles with actors who played Batman. He, Adam West and Val Kilmer have all played John 'Doc' Holliday, in Frontier Marshal (1939), "Colt .45" (1957), "Lawman" (1958) and Tombstone (1993), respectively. Christian Bale and Heath Ledger both played Bob Dylan in I'm Not There. (2007).
Refused to shave off his mustache when he played the role of The Joker in "Batman" (1966). Close observation shows how the white clown make-up was applied right over his much loved mustache.
TV writer Mark Evanier remarked that Romero was usually easily available to cast for TV show guest appearances. Apparently, Evanier knew at least one crew member on a TV show who prepared roles with Romero in mind as a default choice in the likely event that a preferred guest star would pull out of a guest appearance.
Was the first actor to play the Joker in a live action adaptation of the Batman character.