He had to shave his moustache off while preparing to play the Joker in Batman (1966) but refused because he liked his moustache.
His nickname is Butch.
His height was 6' 2" (1.88 m)
Cesar Romero: I had enormous fun playing the Joker on Batman. I ended up doing something like 20 episodes of Batman, as well as the full-length feature film version. There was certainly nothing hard about that assignment! Even the make-up sessions weren't too bad. It took about an hour-and-a-half to put the full make-up on, including the green wig. I didn't mind it at all.
Cesar Romero: I was never stereotyped as just a Latin lover in any case because I played so many parts in so many pictures. I was more of a character actor than a straight leading man. I did many kinds of characters -- Hindus, Indians, Italians. There were very few pictures where I ended up with the girl.