A female Galaxhar who is basically the parallel version of Susan.
The original pitch was an adaptation of Rex Havoc and the Asskickers of the Fantastic, an obscure satirical comic from Warren Publishing (the same folks behind Vampirella). The monsters were mostly established by this point, although B.O.B. was called The Ick! and Ginormica was referred to as the 50,000 Pound Woman.
The monsters would have been imprisoned in Alcatraz at the end of the second act. One draft had the monsters going on the rampage after Derek breaks up with Susan, while another had the President make them take the fall for the destruction of San Francisco.