Some of the information is Boop-Oop-a-Dooping full of SPOILERS. Boop-Oop-a-Doop!
Leona is a character that would have appeared in MGM's scrapped 1993 Betty Boop film known as Betty Boop MGM Zanuck. Leona would have appeared as an antagonist in the film. Not much is known about her, but it is hinted that the character might have been romantically linked to Koko the Clown or used him for her personal gain, as they both appear alone in sequence five of the film script. In one of the official artworks by Fred Cline, she can be seen kicking Bimbo off a cliff while Betty and Koko are falling from the inside of a vehicle.