Though minor footnotes, they deserve mention here if only for their momentary impact to notable characters around them.
Gypsy was a mutant able to blend into her surroundings, and later to project realistic illusions, which she used as a member of the Justice League of Earth-One.
Miss X was in reality Janice Peggy Malone, daughter of a prominent district attorney, who aided Earth-Two's Mister America and his alias Tex Thompson while cloaking her identity and comings-and-goings. She didn't last long, nor did Gypsy. Such was their nature.