Jacklyn and her twin sister Kelli both worked as managers of a small bakery in Tokyo, with the only employee below them during their shift being Sarah Peterson. Both the twins are vile and viscious, the epitome of snobbery. However, their perspective changed slightly once Rubius took a job at their bakery. He kidnapped all three and turned them into henchgirls of the Negamoon.

Jacklyn Brewer became Insectica, the third to be transformed, with many powers not exactly defined and concrete. After the other two had been transformed, she asked Rubius to at least let her choose her powers herself, and so after little deliberation, she decided upon the ability to control all sorts of bugs. Of course, it is more difficult for her to control the more sentient persuasion of bugs rather than the simple-minded ones. Like most girls of the Negaverse and Megamoon, she gets into petty arguments over who is the best-looking, especially with her twin sister Deathwish. Even though she was unwillingly captured, she seems to enjoy this life of evil even more than her previous life.