Lil Jacky is the only child of Jacqueline and Andrew Nightblade. Jacqueline desparately wanted a baby girl. Andrew agreed that they could name their son "Jackson," and call him "Jacky" for short, to appease his wife. Unfortunately, Mrs. Nightblade went a bit too far in her want for a girl, and encouraged young Jacky to pursue growing his naturally beautiful, curly hair. Also unfortunately for Jacky, his genetics betrayed him and gave him wonderfully long eyelashes.
As a result, most of the kids think Lil Jacky is a girl.